Can anyone please tell me the difference where to use union and where to use uinon all in mysql
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http://stackoverflow.com/questions/49925/what-is-the-difference-between-union-and-union-all – 7alhashmi Sep 08 '13 at 11:20
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3Google is really helpful with this type of questions. – Yotam Omer Sep 08 '13 at 11:20
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http://www.mysqlperformanceblog.com/2007/10/05/union-vs-union-all-performance/ – Grijesh Chauhan Sep 08 '13 at 11:20
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1There's a manual for this kind of stuff. No research effort shown. – Strawberry Sep 08 '13 at 12:00
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please check [Answer](http://stackoverflow.com/questions/49925/what-is-the-difference-between-union-and-union-all/21275382#21275382) – Pawan Kumar Jan 31 '17 at 13:14
