How Can I Work Around the ORA-01795 'Maximum Expressions in a List' Error?

Workaround for ORA-01795: Maximum Expressions in a List Error

Encountering the ORA-01795 error, indicating that a query contains more than 1000 expressions in an IN clause, can be frustrating. To resolve this issue, a workaround using multiple IN clauses is recommended.

The syntax for the workaround is as follows:

SELECT field1, field2, field3
FROM table1
WHERE name IN ('value1', 'value2', ..., 'value999')
    OR name IN ('value1000', ... , 'value1999')
    OR ...;

This approach involves dividing the values in the IN clause into smaller groups, each containing a maximum of 1000 values. By splitting the list into multiple IN clauses, the query can bypass the 1000-expression limit.

For example, in your case with 10,000 values, you would create 10 groups of 1000 values each or adjust the grouping as needed.

By implementing this workaround, you can effectively overcome the ORA-01795 error and execute queries with a large number of values in the IN clause.

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