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DROP FUNCTION
Removes a single function from the specified database, including user-defined scalar-valued functions (UDFs) and user-defined table-valued functions (TVFs).
Syntax
DROP FUNCTION [IF EXISTS] { function_name | database_name.function_name }
Remarks
Only one function can be removed using the DROP FUNCTION command.
If DROP FUNCTION is executed for a function that does not exist, the following error will occur:
memsql> DROP FUNCTION myfunction;
ERROR 1998 (HY000): Function 'db1.myfunction' doesn't exist
However, if the IF EXISTS condition is used and the function does not exist, no error will occur:
memsql> DROP FUNCTION IF EXISTS myfunction;
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.
memsql> SHOW FUNCTIONS;
+------------------+-----------------------+
| Functions_in_db1 | Function Type |
+------------------+-----------------------+
| myfunction | User Defined Function |
+------------------+-----------------------+
1 row in set (0.00 sec)
memsql> DROP FUNCTION myfunction;
Query OK, 0 rows affected (0.05 sec)
memsql> SHOW FUNCTIONS;
Query OK, 0 rows affected (0.07 sec)
Dropping a Function in Another Database
The following example removes an existing function while connected to another database in your MemSQL cluster.
memsql> USE db1;
Database changed
memsql> SHOW FUNCTIONS;
+------------------+-----------------------+
| Functions_in_db1 | Function Type |
+------------------+-----------------------+
| myfunction | User Defined Function |
+------------------+-----------------------+
1 row in set (0.00 sec)
memsql> USE db2;
Database changed
memsql> DROP FUNCTION db1.myfunction;
Query OK, 0 rows affected (0.05 sec)
memsql> USE db1;
Database changed
memsql> SHOW FUNCTIONS;
Query OK, 0 rows affected (0.07 sec)
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