Learn what a SQL union is, how it works, and how you can use it to combine data from different tables or sources. Find examples and best practices for using a SQL union.

To use UNION in SQL, you need to write two or more SELECT statements, separated by the keyword UNION. You can also use parentheses to group the SELECT statements, or add an ORDER BY clause to sort ...

proc sql; title 'ME1 and ME2: UNION'; select * from me1 union select * from me2; In the following example, ALL includes the duplicate row from ME1. In addition, ALL changes the sorting by specifying ...

Why does the order of the SELECT statements in the UNION affect the result?This first SQL produces the result I want.SELECT cat_id AS catid, manufacturer AS mfr, model, a_class_id as class_id FROM ...

How to Create a Table From Query Results in Microsoft SQL. If your business uses relational databases to store data, you may have used a SQL SELECT clause to create new tables from query results.

I have a result set stored in #Results.Now I need to add MORE records to that #Results table.The first query selects all of our employees and stores it in #Results.Now what I want to do is go and ...