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Answer Posted / saravakumar
UNION RULES
A UNION must be composed of two or more SELECT statements,
each separated by the keyword UNION.
Each query in a UNION must contain the same columns,
expressions, or aggregate functions, and they must be listed
in the same order.
Column datatypes must be compatible: They need not be the
same exact same type, but they must be of a type that SQL
Server can implicitly convert.
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