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DROP AGGREGATE
Removes a single user-defined aggregate function (UDAF) from the specified database.
Syntax
DROP AGGREGATE [IF EXISTS] { function_name | database_name.function_name }
Remarks
Only one function can be removed using the DROP AGGREGATE command.
If DROP AGGREGATE is executed for a function that does not exist, the following error will occur:
DROP AGGREGATE myaggregate;
ERROR 2219 (HY000): Function 'db1.myaggregate' doesn't exist
However, if the IF EXISTS clause is used and the function does not exist, no error will occur:
DROP AGGREGATE IF EXISTS myaggregate;
Query OK, 0 rows affected (0.00 sec)
Examples
Dropping a Function in the Current Database
The following example removes an existing function from the current database.
SHOW AGGREGATES;
+-------------------+
| Aggregates_in_db1 |
+-------------------+
| multiply_hundred |
| myaggregate |
+-------------------+
2 rows in set (0.00 sec)
DROP AGGREGATE myaggregate;
Query OK, 0 rows affected (0.05 sec)
SHOW AGGREGATES;
+-------------------+
| Aggregates_in_db1 |
+-------------------+
| multiply_hundred |
+-------------------+
1 row in set (0.00 sec)
Dropping a Function in Another Database
The following example removes an existing function while connected to another database in your cluster.
USE db1;
Database changed
SHOW AGGREGATES;
+-------------------+
| Aggregates_in_db1 |
+-------------------+
| multiply_hundred |
| myaggregate |
+-------------------+
2 rows in set (0.00 sec)
USE db2;
Database changed
DROP AGGREGATE db1.myaggregate;
Query OK, 0 rows affected (0.05 sec)
USE db1;
Database changed
SHOW AGGREGATES;
+-------------------+
| Aggregates_in_db1 |
+-------------------+
| multiply_hundred |
+-------------------+
1 row in set (0.00 sec)
