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  2. RPG400-L
  3. February 2011

sql Vs RLA to test existance

Hi,

I need to find if a transaction of a particular type and amount exists for a client.

I cannot remember how to apply the SQL Exists( ) to look for the transaction.

Select '1' from ???? where exists ( select * from mytable where myfield = 'myfield')


Then again, I seem to remember that EXists will scan all the rows and not just stop at the first one that satisfies the search criteria as I could do with RLA.

Can someone put me straight please?

Thanks.


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