Creating Functions : Function « Procedure Function « MySQL Tutorial

MySQL Tutorial
1. Introduction
2. Select Query
3. Database
4. Table
5. Table Join
6. Subquery
7. Insert Update Delete
8. Logic Operator
9. View
10. Data Types
11. Procedure Function
12. Cursor
13. Trigger
14. Date Time Functions
15. Comparison Functions Operators
16. Aggregate Functions
17. Cast Functions Operators
18. Control Flow Functions
19. Encryption Compression Functions
20. Information Functions
21. Math Numeric Functions
22. Miscellaneous Functions
23. String Functions
24. Regular Expressions
25. Data Dictionary
26. MySQL Utilities
27. Privilege
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MySQL Tutorial » Procedure Function » Function 
11. 3. 1. Creating Functions
CREATE    [DEFINER = user | CURRENT_USER }]
    FUNCTION sp_name ([func_parameter[,...]])
    RETURNS Any valid MySQL data type
    [characteristic ...Valid SQL procedure statement

func_parameter:

param_name type

characteristic:

LANGUAGE SQL
  [NOTDETERMINISTIC
  CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA }
  | SQL SECURITY DEFINER | INVOKER }
  | COMMENT 'string'

By default, the function is associated with the default database.

To associate explicitly with a given database, specify the name as db_name.sp_name.

Any SELECT statement using the function simply needs to pass the correct parameters to the function.

mysql>
mysql>
mysql>
mysql> CREATE TABLE Employee(
    ->     id            int,
    ->     first_name    VARCHAR(15),
    ->     last_name     VARCHAR(15),
    ->     start_date    DATE,
    ->     end_date      DATE,
    ->     salary        FLOAT(8,2),
    ->     city          VARCHAR(10),
    ->     description   VARCHAR(15)
    -> );
Query OK, rows affected (0.03 sec)

mysql>
mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->              values (1,'Jason',    'Martin',  '19960725',  '20060725', 1234.56'Toronto',  'Programmer');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(2,'Alison',   'Mathews',  '19760321', '19860221', 6661.78'Vancouver','Tester');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(3,'James',    'Smith',    '19781212', '19900315', 6544.78'Vancouver','Tester');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(4,'Celia',    'Rice',     '19821024', '19990421', 2344.78'Vancouver','Manager');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(5,'Robert',   'Black',    '19840115', '19980808', 2334.78'Vancouver','Tester');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(6,'Linda',    'Green',    '19870730', '19960104', 4322.78,'New York',  'Tester');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(7,'David',    'Larry',    '19901231', '19980212', 7897.78,'New York',  'Manager');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(8,'James',    'Cat',     '19960917',  '20020415', 1232.78,'Vancouver', 'Tester');
Query OK, row affected (0.00 sec)

mysql>
mysql> select from Employee;
+------+------------+-----------+------------+------------+---------+-----------+-------------+
| id   | first_name | last_name | start_date | end_date   | salary  | city      | description |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
|    | Jason      | Martin    | 1996-07-25 2006-07-25 1234.56 | Toronto   | Programmer  |
|    | Alison     | Mathews   | 1976-03-21 1986-02-21 6661.78 | Vancouver | Tester      |
|    | James      | Smith     | 1978-12-12 1990-03-15 6544.78 | Vancouver | Tester      |
|    | Celia      | Rice      | 1982-10-24 1999-04-21 2344.78 | Vancouver | Manager     |
|    | Robert     | Black     | 1984-01-15 1998-08-08 2334.78 | Vancouver | Tester      |
|    | Linda      | Green     | 1987-07-30 1996-01-04 4322.78 | New York  | Tester      |
|    | David      | Larry     | 1990-12-31 1998-02-12 7897.78 | New York  | Manager     |
|    | James      | Cat       | 1996-09-17 2002-04-15 1232.78 | Vancouver | Tester      |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
rows in set (0.00 sec)

mysql>
mysql>
mysql>
mysql>
mysql>
mysql> CREATE FUNCTION myProc (cost DECIMAL(10,2), sal DECIMAL(10,2))
    -> RETURNS DECIMAL(10,2)
    -> RETURN cost * 1.05 + sal;
Query OK, rows affected (0.00 sec)

mysql>
mysql>
mysql>
mysql> SELECT id, first_name, myProc(salary, salaryAS total
    -> FROM employee;
+------+------------+----------+
| id   | first_name | total    |
+------+------------+----------+
|    | Jason      |  2530.85 |
|    | Alison     | 13656.65 |
|    | James      | 13416.80 |
|    | Celia      |  4806.80 |
|    | Robert     |  4786.30 |
|    | Linda      |  8861.70 |
|    | David      | 16190.45 |
|    | James      |  2527.20 |
+------+------------+----------+
rows in set, 24 warnings (0.00 sec)

mysql>
mysql>
mysql>
mysql> drop function myProc;
Query OK, rows affected (0.00 sec)

mysql>
mysql> drop table Employee;
Query OK, rows affected (0.02 sec)
11. 3. Function
11. 3. 1. Creating Functions
11. 3. 2. A function that takes a parameter, performs an operation using an SQL function, and returns the result
11. 3. 3. Single statement function
11. 3. 4. Nested function call
11. 3. 5. Using buildin function in user-defined function
11. 3. 6. Changing and Removing Functions
11. 3. 7. To remove a stored function, use the DROP command
11. 3. 8. Create a procedure for 'READS SQL DATA'
11. 3. 9. ALTER PROCEDURE and ALTER FUNCTION Syntax
11. 3. 10. DROP PROCEDURE and DROP FUNCTION Syntax
11. 3. 11. Function Permissions
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