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ORA-01795: maximum number of expressions in a list is 1000 tips

Oracle Error Tips by Burleson Consulting (S. Karam)

 

The Oracle docs note this on the ora-01795 error*:

ORA-01795 maximum number of expressions in a list is 1000
 
Cause: More than 254 columns or expressions were specified in a list.
Action: Remove some of the expressions from the list.

In the Oracle MOSC Forums, an Oracle user was attempting to find a way around error code ORA-01795.  His question was answered by Reem Munakash of Oracle:

The limit in Oracle8 is 1000 expressions. There is a bug 495555, filed against the error text giving the wrong number (254). However, there may be a further restriction depending on the tool you are using. The 1000 expressions is within sqlplus.

The workaround would be to use a sub-query.

The bug regarding the error message is fixed in 8.1.5.


 

 

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