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ricky007
Starting Member
4 Posts |
 Posted - 2007-08-22 : 08:10:43
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| What is the diffence between joins and queries? When should I go for joins and when should I go for sub queries |
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SwePeso
Patron Saint of Lost Yaks
30421 Posts |
Posted - 2007-08-22 : 08:14:10
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It depends.The question is very much like, "should i buy red apples or green apples today?".It depends on your objective, what you are trying to accomplish with your query.If many "get last record in a group" query, a correlated subquery will do fine.When only fetching a column, a join will perform better.
E 12°55'05.25"N 56°04'39.16" |
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Joins & sub queries