Should all of the application still run?

We have a great (line 100) query that is used to detect bad data. The query looks like

Select * from table where

Clause1 is true - for example, the arguments start_date is null
OR clause2 is true - End_date is null
OR clause3 is true - start_year < 1970
.
. 100 other clauses
.

It seems to me that each clause is evaluated for each row, even if the first clause that evaluates to true is enough to select the line. I think that each article is evaluated because we often receive failures in the function toDate() for null columns and there is no checks before calling toDate().

Is it possible to make the evaluation of query end "beginning"?

Thanks for any help or advice,
-= Philippe

Hello

As Justin said, Oracle will leave evaluate your WHERE clause as soon as it detects a condition is TRUE. If you have proof that it evaluates a condition even if a prior condition is TRUE, then it must be to evaluate the conditions in a different order. Make sure you have up-to-date statistics and appropriate indexes, so that the optimizer can make smart choices about what conditions to evaluate first.

You can force the order by conditions in a CASE statement.
For example, do you now this:

select  *
from    table_x
where   start_date is null
   OR   end_date is null
   OR   start_year < 1970
;

If you know that the third condition (start_year< 1970)="" is="" the="" most="" restrictive,="" and="" therefore="" you="" want="" to="" make="" sure="" it="" is="" done="" first,="" then="" you="" can="" re-write="" the="" query="" like="">

select  *
from    table_x
where   CASE
            WHEN  start_year < 1970   THEN 1
            WHEN  start_date is null  THEN 1
            WHEN  end_date is null    THEN 1
                                      ELSE 0
        END = 1
;

Tags: Database

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