MySQL: unknown table in field list - mysql

Question

I have 3 existing tables: transactions, transaction_types, and expenses:
$> USE `mydb`;
Datebase changed.
$> SHOW TABLES;
expenses
transactions
transaction_types
After adding a stored procedure and 2 triggers on expenses that call the procedure, I'm no-longer able to insert into the table:
$> INSERT INTO `expenses` SET `date`='2013-12-22';
1109. Unknown table 'expenses' in field list
$> INSERT INTO `expenses` (`date`) VALUES('2013-12-22');
1109. Unknown table 'expenses' in field list
But I can select from the able just fine…
If I drop the triggers, I can insert into expenses again.
My 2 triggers are duplicates, 1 for update, 1 for insert:
USE `mydb`;
DELIMITER $$
DROP TRIGGER IF EXISTS `expense_updated_paid`
CREATE TRIGGER `expense_updated_paid`
AFTER UPDATE ON `expenses` FOR EACH ROW
BEGIN
CALL `expense_paid`( NEW.`id` , NEW.`date paid` , NEW.`amount`);
END$$
And the procedure:
USE `mydb`;
DROP procedure IF EXISTS `expense_paid`;
DELIMITER $$
CREATE PROCEDURE `expense_paid`(IN `expense_id` INT, IN `date` DATE, IN `amount` INT)
BEGIN
IF `expenses`.`date paid` IS NOT NULL THEN
SET #type_id = (SELECT `id` FROM `transaction_types` WHERE `name` = 'reimbursement');
INSERT INTO `transactions`
SET
`transactions`.`date` = `date`,
`transactions`.`amount` = `amount`,
`transactions`.`type_id` = #type_id,
`transactions`.`note` = `expense_id`;
END IF;
END$$
I expect MySQL to complain about something in the trigger or procedure if that's causing a problem instead of telling me the table just doesn't exist…

Answer 1

Now that you provided the procedure code, the answer is clear:
IF `expenses`.`date paid` IS NOT NULL THEN
The procedure has no context for expenses.*. That is, you can't use qualified column names inside the procedure when the qualifier refers to a query outside the procedure. This makes more sense if you accept that column qualifiers refer to correlation names in a given query, not to the table itself.
But the procedure does have the date input parameter, which you passed as the same value NEW.\date paid``. So change the line to the following:
IF `date` IS NOT NULL THEN