What is the difference between UNION and UNIONALL?
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Answer Posted / amit dixit
Just Above is OK except UNION ALL result modified..
Example:
Table 1 : First,Second,Third,Fourth,Fifth
Table 2 : First,Second,Fifth,Sixth
Result Set:
UNION: First,Second,Third,Fourth,Fifth,Sixth (This will
remove duplicate values)
UNION ALL:
First,First,Second,Second,Third,Fourth,Fifth,Fifth,Sixth
(This will repeat values)
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