>>You ask for wrong thing. Instead of ask for a non standard feature that >>no DBMS made, and that completely changes SQL, you'd better ask for >>optimized PSQL execution.
>>PSQL engine has none optimization currently. >>Adriano If this change something in string allocation on every change, than maybe it is the way. But this is only one point of this request. Other point is simple string manipulation. Compare: -------------------------------------------------------------------------------------- VAR_S = VAR_A[5] || VAR_A[3] || VAR_A[1]; Vs VAR_S = SUBSTRING(VAR_A FROM 5 FOR 1) || SUBSTRING(VAR_A FROM 3 FOR 1) || SUBSTRING(VAR_A FROM 1 FOR 1); -------------------------------------------------------------------------------------- Or better sample VAR_S[5] = VAR_A[3]; VAR_S[3] = VAR_A[5]; Vs VAR_S = SUBSTRING(VAR_S FROM 1 FOR 2) || SUBSTRING(VAR_A FROM 5 FOR 1) || SUBSTRING(VAR_S FROM 4 FOR 1) || SUBSTRING(VAR_A FROM 3 FOR 1) || SUBSTRING(VAR_S FROM 6); -------------------------------------------------------------------------------------- And i only show some simple sample. How many times you can put wrong calculation in above sample? Especially in the second one? Regards, Karol Bieniaszewski
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