Oracle - Group Functions Used with Non-group Selection Fields in Oracle

Group Functions Used with Non-group Selection Fields in Oracle

Q

Can Group Functions Be Mixed with Non-group Selection Fields in Oracle?

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A

If a group function is used in the SELECT clause, all other selection fields must be group level fields. Non-group fields can not be mixed with group fields in the SELECT clause. The script below gives you an example of invalid SELECT statements with group and non-group selection fields:

SQL> SELECT COUNT(*), department_id FROM departments;
ORA-00937: not a single-group group function

In this example, COUNT(*) is a group field and department_id is a non-group field.

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2019-11-21, 823👍, 0💬

Group Functions Used with Non-group Selection Fields in Oracle
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Use Group Functions in the SELECT Clause in Oracle
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What Are Group Functions in Oracle
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How To Apply Filtering Criteria at Group Level in Oracle? If you want to return only specific groups from the query, you can apply filtering criteria at the group level by using the HAVING clause inside the GROUP BY clause. The following script gives you a good HAVING example: SQL> SELECT dep... 2019-11-21, 689👍, 0💬

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