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difference btwn DISTINCT and UNION
- Thread starter sunshine9
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tlbroadbent
MIS
There is no way to compare as each has a different function. The Distinct keyord will eliminate duplicates in a result set when used in a Select query. The Union operator combines multiple row sets (multiple select queries) into one result set.
By default, Union does eliminate duplicates in the final result. Perhaps this is a source of confusion. For simple selects where distinct (non-duplicated) results are desired use the Distinct keyword. When combining result sets into one use the Union operator. Duplicates wil be elimnated unless the ALL keyword is used with the UNION operator. Terry L. Broadbent - DBA
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faq183-874 contains "Suggestions for Getting Quick and Appropriate Answers" to your questions.
By default, Union does eliminate duplicates in the final result. Perhaps this is a source of confusion. For simple selects where distinct (non-duplicated) results are desired use the Distinct keyword. When combining result sets into one use the Union operator. Duplicates wil be elimnated unless the ALL keyword is used with the UNION operator. Terry L. Broadbent - DBA
Computing Links:
faq183-874 contains "Suggestions for Getting Quick and Appropriate Answers" to your questions.
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