在 MySQL 中创建 function 时出现错误 #1064

Question

friends.

I am trying to create function in MySQL using this script:

CREATE FUNCTION CurrentMemoDepartment(MID INT)
RETURNS INT
BEGIN
  DECLARE DeptID INT;
  SET DeptID = 0;
  SELECT TOP 1 TDeptID INTO DeptID FROM Transactions WHERE MemoID = MID ORDER BY ID DESC;
  RETURN DeptID;
END

but it says:

1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 4

Answer 1

Single-statement function does not need in BEGIN-END, intermediate variables, DELIMITER reassing.

And MySQL uses LIMIT , not TOP n .

CREATE FUNCTION CurrentMemoDepartment(MID INT)
RETURNS INT
RETURN SELECT TDeptID 
       FROM Transactions 
       WHERE MemoID = MID 
       ORDER BY ID DESC
       LIMIT 1;

Answer 2

USE DELIMITER for declaring

like

DELIMITER $$
CREATE FUNCTION CurrentMemoDepartment(MID INT)
RETURNS INT
BEGIN
  DECLARE DeptID INT;
  SET DeptID = 0;
  SELECT TDeptID INTO DeptID FROM Transactions WHERE MemoID = MID ORDER BY ID DESC LIMIT 1;
  RETURN DeptID;
END$$
DELIMITER ;