CELKO (12/27/2012)
All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists."!
The term for this is "union compatible" and it means that both tables in a set operation have to have the same number of columns and those columns have to match by data type and by position.
Further more, the result of a set operation is a table whose columns have no names. This means that you need to write an AS clause to name them.
(<table expr #1>
[UNION | INTERSECT | EXCEPT] [ALL]
<table expr #2>)
[AS] <table name> (<column list>)
No you don't for SQL Server. The first query provides all the column names.
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