question

There are 2 general methods for combining data from 2 sources. - One is done using a JOIN to match rows from the 2 sources based on one or more key values. The 2 sources can have very different columns, and the columns are combined so the total number of columns available (but not necessarily returned) in the output is the sum of the number of columns from each source. - The other method uses UNION or UNION ALL to merge the 2 sources into one. Unlike a JOIN, the 2 sources must have the same number of columns with the same data types, and the output matches those columns as well. The UNION ALL operation returns all of the data from the first source plus all of the data from the second. Without specifying ALL, the UNION operation removes duplicate rows and just returns distinct rows. You said you want to get output "based on ID", so I originally thought you wanted a JOIN. This is older documentation (for SQL Server 2008 R2), but it still applies and explains the various types of JOINs. [ https://technet.microsoft.com/en-us/library/ms191472(v=sql.105).aspx][1] When I opened your Excel worksheet, however, your output contains the the rows from Table1 plus the row from Table2. That looks more like a UNION. The first 3 links in the following article explain UNION and UNION ALL along with the similar semi-join and anti-join operators INTERSECT and EXCEPT. [ https://technet.microsoft.com/en-us/library/ms186316(v=sql.105).aspx][2] Based on your tables and output in the worksheet, I believe this is what you want: SELECT ID, GroupId, Text FROM Table1 UNION ALL SELECT ID, GroupId, Text FROM Table2 ; [1]: https://technet.microsoft.com/en-us/library/ms191472(v=sql.105).aspx [2]: https://technet.microsoft.com/en-us/library/ms186316(v=sql.105).aspx