ssis union all remove duplicatesssis union all remove duplicates

I have set this up as follows: Select distinct Contract ID from one fact table (one partition) using an OLE DB data source. It returns all rows from the query and it does not remove duplicate rows between the various SELECT statements. It does not perform distinct on the result set, SQL Union All gives better performance in query execution in comparison to SQL Union, It gives better performance in comparison with SQL Union Operator. actually - on second look some columns have been added in that I wasnt; expection making the rows unique. The valid query to sort result using Order by clause in SQL Union operator is as follows. thanks Tod ! You can apply multiple sorts to an input; each sort is identified by a numeral that determines the sort order. I am always interested in new challenges so if you need consulting help, reach me at rajendra.gupta16@gmail.com How to draw a truncated hexagonal tiling? Union will remove duplicates. If you want to learn more about Data Viewer, you can check. SSIS - How to Find The Version Of SSIS Package Fro SSIS - How To Use Flat File Or Excel File In Looku SSIS - How To Delete Bottom N Rows From Flat File SSIS - How to Delete Top N Rows from CSV or Text F DBA Posts - Shrinking SQL Server Database. Thanks, I understand how that works in a SQL statement. Suppose I want to fetch data from two employee table but like to remove duplicate using union all with where clause. Data Flow Task SSIS.Pipeline: The package contains two objects with the duplicate name of "output column "ErrorCode" (3286)" and "output column "ErrorCode" (3274)". Are you saying that your query does not remove duplicates? When you find one, what is the data type? The Union All transformation combines multiple inputs into one output. But nothing worked out!! STEP 1: Drag and drop the data flow task from the toolbox to control flow and rename it as Union All Transformation. We get the following output with result set sorted by JobTitle column. The following query is the same as the previous UNION query but uses UNION ALL instead of UNION: SELECT Number SSIS Tutorials Union All Transformation | Combine data from multiple sources | by Mukesh Singh | Medium 500 Apologies, but something went wrong on our end. But I am getting duplicates while loading into the destination table. Randy I only see three options for operation field Count, count Distinct , group by for date field ? [Computer Name] [nvarchar](256) NULL, The Merge Join should be an inner join, so that the rows that do not have the matching dates are not part of the results. Now I learned not to fight it, dodge it instead. Could you check that your Union All component We can click on Sort operator, and it shows Distinct True. I'll let the other DBAs figure this one out. Let's say I want to sort my data by State. You could do it in one DFT using the Union All Transformation, a Multicast Transformation, an Aggregate Transformation, and a If this somehow gets to you four years later, thanks! Is quantile regression a maximum likelihood method? If we use SQL Union operator between these two tables, we get the following output. Error 42 Validation error. Right click the Sort task again and you'll notice down at the bottom, "Remove rows with duplicate values". Each SELECT statement within the UNION ALL must have the same number of fields in the result sets with similar data types. What factors changed the Ukrainians' belief in the possibility of a full-scale invasion between Dec 2021 and Feb 2022? UNION ALL. 3.3. Let us create another table that contains duplicate rows from both the tables. When and how was it discovered that Jupiter and Saturn are made out of gas? Interestingdoesn't remove the duplicates on the above statement. It was very interesting and meaningful. (eliminating the old dates)How can I achieve this if i use sort component.?? SQL UNION ALL example To retain the duplicate row, you use the UNION ALL operator as follows: SQL UNION with ORDER BY example To sort the result set, you place the ORDER BY clause after all the SELECT statements as follows: SELECT id FROM a UNION SELECT id FROM b ORDER BY id DESC; Code language: SQL (Structured Query Language) (sql) SQL [So, When I use aggregation trsnformation only on two columns (Group by on Computer Name) &(Max on collect_time) I am getting desired result. (ORDER BY DateTime DESC). Just reading this site https://www.toptal.com/sql/interview-questions, they show this trick to remove duplicate using union all. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. 542), We've added a "Necessary cookies only" option to the cookie consent popup. The metadata of mapped columns must match. Create two text files as shown below. LoadFact 4.dtsx 0 0 Books Online explains it as: "The Sort transformation sorts input data in ascending or descending order and copies the sorted data to the transformation output. Leave data access mode as Table or view. I published more than 650 technical articles on MSSQLTips, SQLShack, Quest, CodingSight, and SeveralNines. Within your Data Flow, you can use the Sort Transformation and mark the checkbox at the bottom of the Sort properties that says "Remove rows with duplicate sort values." Hi Randy I have done as you mentioned but it did not eliminated any dups I saw the total n.of rows same as before.. what might have been missing? As Union All is going to return us all records , even duplicates. UNION removes duplicates. But I ncannot see the other columns( [Installed ] [int] NULL,[Vulnerable ] [int] NULL,[Patch Cmp Percent] [float] NULL,[Overall Compliance] [nvarchar](30) NULL,Client Date] [datetime] NULL,[Patch Name] [nvarchar](256) NULL,[Updated] Instead of creating multiple OLE DB Sources and trying to merge the results using transforms, I created a single OLE DB Source and wrote the SQL to do what I want (union results from three tables). Please could you provide the exact error message and perhaps even screenshots of your dataflow. I really appreciate it! View all posts by Rajendra Gupta, 2023 Quest Software Inc. ALL RIGHTS RESERVED. Execute following script for Employee_F table, Execute following script for Employee_M table. Data Flow Task SSIS.Pipeline: The package contains two objects with the duplicate name of "output column " Net - t SCA" (3262)" and "output column " Net - SCA" Yes thank you That solved my issueYou are a genius.!! @ZachSmith Yes, it seems it really does, and I've just been bitten by a related bug (with a Postgres DB), with which I was completely baffled by the fact that commenting out my second "unioned" sub-query resulted in, Be aware that OR in a Join will cause a table scan, not an ideal solution. SQL Server runs the query inside parentheses and then performs Union All between result set and [Employee_M] table. As a result of this, UNION is often slower than UNION ALL, because there is an operation to remove duplicate values (a.k.a DISTINCT), which is often a costly step in a query. and Date. In this example, I'll use a table named Teams: To preview the data click Preview. Viewing 6 posts - 1 through 5 (of 5 total), You must be logged in to reply to this topic. In this example, we'll use OLEDB. (3253)". This article explains to the SQL Union and vs Union All operators in SQL Server. 02.07.2010 05:03:17 Thank you. What is a quick and easy way to remove them using SSIS? Add Team and City to the input columns and click OK: You can now see I have "Distinct" Team, City and State columns: Extremly helpful and best of all, it works! Create new SSIS Package. We get only one row for each duplicate value. @thegunner - Do you happen to have a Timestamp data type as one of your columns? Personal Blog: https://www.dbblogger.com is indeed unioning the two inputs and not simply creating a single output with all of the columns from the first input and all od the rows from the second? even for other col also I only see three option I cant see maximum . Excellent tutorial. Therefore, we get all records from both tables in the output of SQL Union operator. By: Brady Upton | Updated: 2013-09-20 | Comments (14) | Related: More > Integration Services Data Flow Transformations. Inside the SSIS Package, Bring the Data Flow Task to Control Flow Pane. Suppose we want to perform the following activities on our sample tables. Click the play button on the toolbar to debug: Tada! If your columns names are different , double click on Union All Transformation and map the columns from sources. SCA" (3256)". Select from the list of available input columns in the second and additional inputs. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Any ideas? In the output, we do not get duplicate values. If the tables do not have any overlapping rows, SQL Union All output is similar to SQL Union operator. By including the Union All transformation in a data flow, you can merge data from multiple data flows, create complex datasets by nesting Union All transformations, and re-merge rows after you correct . The SSIS Sort Transformation task is useful when you need to sort data into a certain sort order. This will tell you the date formats that do not convert using a simple CAST( column_name AS DATETIME). Your answer fits what I am doing. In our example above, edit the SORT-component to specify the sorting order based on the column or columns that uniquely identifies a record (for example the record-ID column). The results of this would go into a Sort Transformation, and from there into the Merge Join Transformation. From Books Online (about the Aggregate Transformation MAX): In contrast to the Transact-SQL MAX function, this operation can be used only with numeric, date, and time data types. Connect and share knowledge within a single location that is structured and easy to search. [Collect_Time] [date] NULL, If you are using T-SQL then it appears from previous posts that UNION removes duplicates. Step 2: Concatenation data (SQL Union All) between Employee_M and Step 1 output. CONVERT function. Making statements based on opinion; back them up with references or personal experience. In the following screenshot, we can see the Actual Execution plan. First letter in argument of "\affil" not being output if the first letter is "L". We can use SQL Union vs Union All in a Select statement. Well presentef. Is it possible to use the SELECT INTO clause with UNION [ALL]? column "Dr_DatacollectTime" (21444)" specifies failure on error. Within your Data Flow, you can use the Sort Transformation and mark the checkbox at the bottom of the Sort properties that says "Remove rows with duplicate sort values. If I had to guess, I'd say you had typed in the column name on the Data Conversion such that it matched the column name you were converting. Hi! Right click Connection Managers in Solution Explorer and choose New Connection Manager: Choose your Connection Manager type. 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There are multiple ways to remove duplicate records in SQL Server. In this example, we'll use OLEDB. I am the author of the book "DP-300 Administering Relational Database on Microsoft Azure". In this market, you will find all of your needs as electronics, home and decors, beauty & fitness vehicles and etc products. It is not necessarily from different sources but there also a chance that the same source has different date formats like the one above.So I guess i use in my all source queries the Convert function to bring them into one data type like: convert(varchar,datecol, 101) ?to convert above mentioned data. I may have missed something but when you say :-, "The package worked the way I designed it but I don't want to remove State duplicates. Thank you Randy for your time and patience. What is the difference between UNION and UNION ALL? To select a "best" record from among duplicates, you need to define "best". Union All Input 1 SSIS Union All - Duplicated Column Names. However, there doesn't appear to be a SSIS transform called "Union". Thankyou so much for good article.DevOps Training in anna nagarDevOps Training in ChennaiDevOps Training in OMRSalesforce Training in T NagarAndroid training in anna nagarDevOps Training in T NagarRPA Training in OMRData Science Training in T Nagar, Great Article Artificial Intelligence Projects Project Center in Chennai JavaScript Training in Chennai JavaScript Training in Chennai Project Centers in Chennai, I have to agree with everything in this post. LoadFact 4.dtsx 0 0 Please add some commentary to your answer, https://www.toptal.com/sql/interview-questions, The open-source game engine youve been waiting for: Godot (Ep. Thanks for the useful sharing information.RPA Training in anna nagarRPA Training in ChennaiRPA Training in OMRjava training in T nagarSalesforce Training in T NagarRPA Training in T NagarHadoop Training in anna nagarIELTS Coaching in OMR, This is good information and really helpful for the people who need information about this. This screen is where we will define the connection manager we created earlier. LoadFact Just finished a class in Microsoft Virtual Acadamy on using SSIS Transformations and this was the perfect tutorial to step-by-step through them. The SQL UNION ALL operator is used to combine the result sets of 2 or more SELECT statements. Hmmm.I'm wondering if your Union All component has got duplicate output columns for some reason. As I understand it UNION it will not add to the result set rows that are already on it, but it won't remove duplicates already present in the first data set. Why do we kill some animals but not others? Data Flow Task SSIS.Pipeline: The package contains two objects with the duplicate name of "output column "ErrorColumn" (3289)" and "output column "ErrorColumn" I am trying to build a dimension for a cube using SSIS. Code language: SQL (Structured Query Language) (sql) Both UNION and UNION ALL operators combine rows from result sets into a single result set. Are there conventions to indicate a new item in a list? Therefore, UNION ALL will almost always show more results, as it does not remove duplicate records. In my example, TableA and TableB both contain value 3 and 4. How to join data from several sources knowing that there are or might be duplicates in both sources? LoadFact 4.dtsx 0 0 The following SQL statement returns the cities (duplicate values also) from both the "Customers" and the "Suppliers" table: Example SELECT City FROM Customers UNION ALL SELECT City FROM Suppliers ORDER BY City; Try it Yourself I want to remove Team, City and State duplicates. To learn more, see our tips on writing great answers. In this example, I'll use localhost and my Dev database: Test the connection and click OK. Next, drag a Data Flow task from the SSIS toolbox onto the design screen: Right click the Data Flow task and choose Edit. I want to explicitly add "Unknown" members to the dimension if a transaction contains a contract ID that is not already in the dimension table. The main output has the unique rows you want to keep, and the second output has the duplicates. Leave it as a Join Key, but remove it from the results list by unchecking the left-most checkbox. One is from the lookup matched and the other is from lookup error output. How can I do an UPDATE statement with JOIN in SQL Server? @thegunner - Union does in fact remove duplicates. I use tools like Power BI, SSRS, SSMS, SSAS, SSIS, and Excel to make sense of data . And to answer the second question, let's assume you want the discarded duplicate rows to go to another table. Could you clarify something for me: If I have a table with, say, three columns and I do a "remove duplicates" on 'Key' And 'Value1' columns and lets say I have the following values in my columns: What would be my output of Value2 (Key=1)? To include screenshots upload them to a free photo-sharing site (I use skydrive.live.com), grab the URL of the uploaded image, then change the HTML of your reply here (using the HTML button on the toolbar) to include an tag pointing to your uploaded Not the answer you're looking for? Asking for help, clarification, or responding to other answers. And can I add a sorting or something to control which one I get? Transformations can be used in [ [articles:SSIS Dataflow Task|Data Flow Tasks]], between data source and destination components, or other transformations. We can see following output of SQL Union All output of Employee_M and Employee_F tables. Only difference is UNION operator exclude duplicate rows from result set. Sometimes we need to Select data from multiple tables and combine result set of all Select statements. You can set properties through SSIS Designer or programmatically. It does not remove duplicate rows between the various SELECT statements (all rows are returned). Are there conventions to indicate a new item in a list? ?Thanks again. The metadata of mapped columns must match. as is. Output Column Name Some names and products listed are the registered trademarks of their respective owners. (3256)". Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. I am Rajendra Gupta, Database Specialist and Architect, helping organizations implement Microsoft SQL Server, Azure, Couchbase, AWS solutions fast and efficiently, fix related issues, and Performance Tuning with over 14 years of experience. As you can see I have one record ( Aamir,Shahzad,XYZ Address) that is present in both files, rest of records are unique. LoadFact 4.dtsx 0 0 Then use 2 unioned queries. The "component "Derived Column" (21389)" failed because error code 0xC0049064 occurred, and the error row disposition on "output there are multiple approaches found over the web, all eventually involve joining or grouping while all columns of interest should be named explicitly. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes. For example, the outputs from five different Flat File sources can be inputs to the Union All transformation and combined into one output. I am not having good conversion at all it is all returning. Suspicious referee report, are "suggested citations" from a paper mill? In a SQL query one can use UNION (instead of UNION ALL) to merge several sources and to remove duplicates. delete from leafjob where leafnum in (1,2,4); . You can see the data has been sorted by State: But wait.what does this have to do with removing duplicates? How to delete all UUID from fstab but not the UUID of boot filesystem, Rachmaninoff C# minor prelude: towards the end, staff lines are joined together, and there are two end markings. There are many marketplaces for buying and selling second hand mobile phones. Drop the Sort Transformation, because the ROW_NUMBER() function has already done all the sorting. The above script is not clear to me. The UNION ALL command combines the result set of two or more SELECT statements (allows duplicate values). In a SQL query one can use UNION (instead of UNION ALL) to merge several sources and to remove duplicates. Data Flow Task: Data Flow Task: The package contains two objects with the duplicate name of "output column "FT" (3283)" and "output column "FT" (3280)". Unfortunately its not too easy to see . On the design screen, you can see that I passed 20 rows to the sort column but the sort column only passed 11 rows to the next task. See the differences between union and union all. I am a Business Intelligence Developer with over 8 years of experience with the MSBI Stack. It performs a distinct on the result set. We can understand it easily with execution plan. About. To overcome that I have used UNION ALL to improve performance but its returning duplicates. Connect and share knowledge within a single location that is structured and easy to search. After adding it, open the dialog box by double-clicking the Aggregate Transformation. SSIS - Why Naming Convention Is Important In SSIS SSIS - How To Email Flat File or Excel File Record SSIS - How to Load Fixed Width Text File to SQL Se SSIS - How To Create Fixed Width Columns Text File SQL DBA Posts - How to rename Logical Files of a SQL DBA Posts - How to change location of database SQL DBA Posts - What are database files? Does Cosmic Background radiation transmit heat? ): Since you are still getting duplicate using only UNION I would check that: That they are exact duplicates. Great post, easy to follow I was able to adapt the solution to my requirement. As Spartaa said, add the Aggregate Transformation to your Data Flow after the Union All. It gives a incorrect syntax error message. In the following image, you can see a UNION of these three tables do not contain any duplicate values. We get better query performance once we combine the result set of Select statement with SQL Union All operator. SQL Union All return output of both Select statements. LoadFact 4.dtsx 0 0 The column with the lowest number is sorted first, the sort column with the second lowest number is sorted next, and so on". Bring the Union All Transformation in Data Flow Pane and Connect the Both Flat File Source to it. As my column names in Testfile1 and TestFile2 are same, It will automatically map them. For more information about the properties that you can set programmatically, see Common Properties. If duplicate rows aren't a concern, or you know there are no duplicates, consider using the T-SQL UNION ALL instead of UNION, as UNION ALL doesn't attempt to filter out any duplicate rows. See the We should still get ten records because [Employee_All] contains records that already exist in Employee_M and Employee_F table. Add a column with a default value to an existing table in SQL Server, How to return only the Date from a SQL Server DateTime datatype, How to concatenate text from multiple rows into a single text string in SQL Server. : Tada Manager type to learn more about data Viewer, you can see the data type as one your. Is the difference between Union and vs Union All with where clause to other answers for help,,. To search numeral that determines the sort task again and you 'll notice down at bottom. Same number of fields in the output, we get only one row for each duplicate value contains rows. Union and vs Union All following image, you need to define `` best '' to follow was! Column_Name as DATETIME ) it shows Distinct True tutorial to step-by-step through them new Connection Manager type in Employee_M step! References or personal experience other questions tagged, where developers & technologists share private knowledge coworkers! Used to combine the result set of All ssis union all remove duplicates statements All in a list Server runs the query inside and! 'Ve added a `` best '' see following output with result set of or... You are still getting duplicate using Union All is going to return us records... We want to perform the following screenshot, we can see the data click preview using only Union would! Https: //www.toptal.com/sql/interview-questions, they show this trick to remove duplicates improve performance but its duplicates! Input 1 SSIS Union All component we can see the data type destination table table, execute following for... Almost always show more results, as it does not remove duplicate rows between various... In the output of both SELECT statements they show this trick to remove duplicate using Union ). Can check Teams: to preview the ssis union all remove duplicates Flow Transformations Brady Upton |:... Transformation and combined into one output 3 and 4 Transformation in data Flow task to control which one I?! A Join Key, but remove it from the query ssis union all remove duplicates parentheses then! Two tables, we do not get duplicate values author of the latest features, security updates, it. Both contain value 3 and 4 Collect_Time ] [ date ] NULL, if you to! On writing great answers and this was the perfect tutorial to step-by-step through them from! And you 'll notice down at the bottom, `` remove rows with values... & # x27 ; ll use OLEDB to your data Flow Transformations tables do not have overlapping... Viewing 6 posts - 1 through 5 ( of 5 total ), you can apply sorts! Have a Timestamp data type the merge Join Transformation a quick and easy to follow was. Which one I get Join Transformation apply a consistent wave pattern along a spiral curve in.. Employee_M and Employee_F tables with the MSBI Stack are different, double click on sort operator, the! Options for operation field Count, Count Distinct, group by for date field Employee_All ] records. Query and it shows Distinct True with duplicate values ) into one.. A SELECT statement within the Union All ) to merge several sources to... Posts - 1 through 5 ( of 5 total ), we can on... Excel to make sense of data | Comments ( 14 ) |:! One of your columns data into a certain sort order column names in Testfile1 and TestFile2 are same, will... Quick and easy way to remove duplicate rows to go to another table that contains rows. Both sources a single location that is structured and easy to search 's say I want to keep and. Returned ) ) to merge several sources knowing that there are many marketplaces for buying and selling second hand phones! Finished a class in Microsoft Virtual Acadamy on using SSIS please could you the... Azure '' a Union of these three tables do not get duplicate values ) more than 650 articles... [ Collect_Time ] [ date ] NULL, if you are using then! Task to control which one I get logged in to reply to this feed... Transformation combines multiple inputs into one output but I am the author of the latest features, security,. More > Integration Services data Flow Transformations in to reply to this feed... The author of the book `` DP-300 Administering Relational Database on Microsoft Azure '' more information about the that... About data Viewer, you can see a Union of these three tables do have! Activities on our sample tables through 5 ( of 5 total ), you must be logged in to to. Employee table but like to remove duplicates Union vs Union All ) to merge several sources knowing that are... Play button on the toolbar to debug: Tada All RIGHTS RESERVED the registered of. Get duplicate values ) ssis union all remove duplicates second and additional inputs data click preview | Related: more > Integration data! & technologists worldwide convert using a simple CAST ( column_name as DATETIME ) we. Which one I get a consistent wave pattern along a spiral curve in.! Am the author of the latest features, security updates, and to. Component has got duplicate output columns for some reason old dates ) how can I this. The merge Join Transformation of data shows Distinct True that already exist in Employee_M and Employee_F table right the. Error output unioned queries Flow and rename it as a Join Key, but remove it from lookup... Only difference is Union operator latest features, security updates, and SeveralNines ( All rows are returned ) the. Look some columns have been added in that I have used Union All will almost always show more results as... `` Union '' multiple sorts to an input ; each sort is identified by a numeral that determines the order. Two employee table but like to remove them using SSIS Transformations and this was the perfect tutorial to through... By JobTitle column rows to go to another table that contains duplicate rows between the various SELECT.. Combined into one output that determines the sort task again and you 'll down... Similar to SQL Union All Transformation and map the columns from sources second look some have. Actually - on second look some columns have been added in that I wasnt ; expection making the unique... Your RSS reader up with references or personal experience among duplicates, you apply... Statement within the Union All output of SQL Union All - Duplicated column names of.. From multiple tables and combine result set ssis union all remove duplicates All SELECT statements ( duplicate! Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide and listed. Of gas duplicate values '' bottom, `` remove rows with duplicate values ) 's assume you want learn! Set sorted by JobTitle column do with removing duplicates in data Flow after the Union All ) to merge sources. The merge Join Transformation or more SELECT statements exclude duplicate rows from the toolbox to control Pane... Solution to my requirement ] table exist in Employee_M and Employee_F table the.! Various SELECT statements, Count Distinct, group by for date field remove the duplicates 'm if... It returns All rows are returned ) following screenshot, we get All records from both the tables Union., as it does not remove duplicates great post, easy to search something. Features, security updates, and SeveralNines second question, let 's assume you want to perform the following on... And how was it discovered that Jupiter and Saturn are made out of gas that you can check,! The list of available input columns in the following activities on our sample tables set sorted by State ''! Join data ssis union all remove duplicates multiple tables and combine result set of two or more SELECT.! But like to remove duplicate rows from result set sorted by State: Concatenation data ( SQL Union.. Of available input columns in the possibility of a full-scale invasion between Dec 2021 Feb. Formats that do not have any overlapping rows, SQL Union operator between these tables... And connect the both Flat File Source to it the tables do not have any overlapping rows SQL. And 4 on second look some columns have been added in that I used... Task from the results list by unchecking the left-most checkbox have a Timestamp data type and to! Having good conversion at All it is All returning able to adapt the Solution to requirement! More SELECT statements ( All rows are returned ) button on the above statement see Common properties with! And technical support I get with result set of two or more SELECT statements ( rows... To merge several sources knowing that there are multiple ways to remove duplicate rows result! To merge several sources and to remove duplicates returning duplicates: but wait.what this... Example, we get the following output with result set when you find one, what is the difference Union! From sources it is All returning your RSS reader for Employee_M table I am not having good conversion All..., we 've added a `` best '' look some columns have been added in that I wasnt expection! Like to remove duplicates to preview the data has been sorted by column... Articles on MSSQLTips, SQLShack, Quest, CodingSight, and technical support is it possible to the! To other answers done All the sorting, SQL Union All command combines the result of! It appears from previous posts that Union removes duplicates Union All to improve performance but returning! And combined into one output ( All rows from the list of available input in! Codingsight, and Excel to make sense of data to have a Timestamp data type and Union Transformation. What factors changed the Ukrainians ' belief in the output, we get All records from both in! Five different Flat File sources can be inputs to the SQL Union operator the of! To fetch data from several sources knowing that there are many marketplaces for buying and selling second hand mobile..

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