January 2005
Beginner to intermediate
928 pages
22h 14m
English
book
Understanding DB2®: Learning Visually with Examples
by Raul F. Chong, Clara Liu, Sylvia F. Qi, Dwaine R. Snow
Content preview from Understanding DB2®: Learning Visually with Examples
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9.6. The UNION, INTERSECT, and EXCEPT Operators
UNION, INTERSECT, and EXCEPT are operators that can be used to obtain the union, intersection, and difference between fullselect, subselect, or values-clause. Figure 9.31 shows the syntax diagram of the UNION, INTERSECT, and EXCEPT operators.
Figure 9.31. Syntax diagram of the UNION, INTERSECT, and EXCEPT operators
>>-+-subselect---------+----------------------------------------> +-(fullselect)------+ '-| values-clause |-' .----------------------------------------------. V | >----+------------------------------------------+-+-------------> '-+-UNION---------+--+-subselect---------+-' +-UNION ALL-----+ +-(fullselect)------+ +-EXCEPT--------+ '-| values-clause |-' +-EXCEPT ALL----+ +-INTERSECT-----+ ... |
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