Question

I’m fairly new to SQL in general and even more so to MySQL and I’ve hit a stumbling block. I’m attempting to use a procedure to copy the value of one field to another if the original field is not null, this procedure is then called by triggers whenever the table is updated or has a new row inserted into it. Here is what I have so far:

-- WORK_NOTES_PROCEDURE - This copies the contents of the estimate notes to the work   order notes if the original estimate had any notes with it.
DROP PROCEDURE IF EXISTS 'WORK_NOTES_PROCEDURE';
DELIMITER $$

CREATE PROCEDURE WORK_NOTES_PROCEDURE()
BEGIN
DECLARE var_temp VARCHAR(50);

SET var_temp := (SELECT ESTIMATE_NOTES FROM ESTIMATES WHERE ESTIMATES.ESTIMATE_NUMBER = WORK_ORDERS.ESTIMATE_NUMBER);

IF var_temp IS NOT NULL THEN

UPDATE WORK_ORDERS SET WORK_ORDER_NOTES = var_temp WHERE WORK_ORDERS.ESTIMATE NUMBER = ESTIMATES.ESTIMATE_NUMBER;

END IF; 
END$$

DELIMITER ;

Absolutely any help would be appreciated, the error I’m getting is a syntax error for the line where I’m assigning a value to var_temp.

Answer 1

try,

SET var_temp = (SELECT ESTIMATE_NOTES 
                FROM ESTIMATES INNER JOIN WORK_ORDERS
                     ON ESTIMATES.ESTIMATE_NUMBER = WORK_ORDERS.ESTIMATE_NUMBER
                LIMIT 1);