DataSource Controls :: Order In Which Inner Join Sql Statement Is Executed?
Jun 30, 2010
I was wondering in which order MSSQL executes a command. Say if I have this statement:
select top 1 * from table1 t1
inner join table2 t2 on t2.productid = t1.id
order by t1.buydate desc
what is done first:
- find if there's a matching record in t2 through the join
OR
- sort the results in t1 based on the buydate?
And when I have a large database with many records in both t1 and t2, what are possible performance issues I might hit?
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