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Can I write my own MySQL functions to use in MySQL queries?
Yes, you can write own MySQL function to use in MySQL queries. Following is the syntax:
DELIMITER // CREATE FUNCTION yourFunctionName(optional parameters)) RETURNS yourDataType DETERMINISTIC NO SQL BEGIN yourStatements1 . . . . N END // DELIMITER ;
We have used the CREATE FUNCTION above to create a custom function.
Let us create a custom MySQL function to use in MySQL query:
mysql> DELIMITER //
mysql> CREATE FUNCTION get_First_Name(Name VARCHAR(255)) RETURNS
VARCHAR(255)
DETERMINISTIC
NO SQL
BEGIN
RETURN LEFT(Name,LOCATE(' ',Name) - 1);
END
//
Query OK, 0 rows affected (0.20 sec)
mysql> DELIMITER ;Now call the above function using SELECT statement:
mysql> select get_First_Name('David Miller');This will produce the following output:
+--------------------------------+
| get_First_Name('David Miller') |
+--------------------------------+
| David |
+--------------------------------+
1 row in set, 2 warnings (0.00 sec)
Updated on: 30-Jul-2019
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