Question

Getting a Operand should contain 1 column(s) mysql error whenever I try to insert into the table sets.

I googled and found a hoard of similar questions but they are always pin point specific to solving their immediate problem. I have mysql 5.6 by the way. I am allowed multiple TIMESTAMPS.

Here is my code:

INSERT INTO `sets` (`tabler_name`) VALUES ("leads_auto");

Here is my table:

CREATE TABLE IF NOT EXISTS `lms`.`sets` (
    `set_id` BIGINT NOT NULL AUTO_INCREMENT,
    `on_off` SMALLINT NOT NULL DEFAULT 0,
    `tabler_name` VARCHAR(45) NULL,
    `origin_date` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    `last_modified_date` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    `original_count` INT NULL,
    `current_count` INT NULL,
    `source_type` VARCHAR(45) NULL,
    `source` VARCHAR(45) NULL,
    `method` VARCHAR(45) NULL,
    `agent` VARCHAR(45) NULL,
    `dupes` INT NULL,
    `bads` INT NULL,
    `aged` INT NULL COMMENT 'This table keeps track of the record sets that enter the system.        Example: a set of leads imported into the database.',
    PRIMARY KEY (`set_id`)
) ENGINE = InnoDB;

Stored Procedure:

DELIMITER //

CREATE PROCEDURE `lms`.`leads_to_bak` ()
BEGIN
SET @table1 = (SELECT `tabler_name` FROM sets WHERE on_off=0 LIMIT 1);
SET @table2 = CONCAT(@table1, '_bak');
SET @SQL1 = CONCAT('INSERT INTO ',@table2, '(', (SELECT
REPLACE(GROUP_CONCAT(COLUMN_NAME), 'lead_id,', '') FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = @table2), ')', ' SELECT ', (SELECT                                                                   REPLACE(GROUP_CONCAT(COLUMN_NAME), 'lead_id,', '') FROM INFORMATION_SCHEMA.COLUMNS WHERE       TABLE_NAME = @table1), ' FROM ', @table1);
PREPARE stmt FROM @sql1;
EXECUTE stmt;
END//

DELIMITER ;
USE `lms`;

Trigger

DELIMITER $$

USE `lms`$$

CREATE TRIGGER `lms`.`after_insert_into_leads`
AFTER INSERT ON `sets` FOR EACH ROW
BEGIN
IF (SELECT * FROM sets WHERE on_off=0 LIMIT 1) THEN
CALL lms.leads_to_bak();
END IF;
END$$

DELIMITER ;
USE `lms`;

I don’t see anything wrong with my routines. Removing the routines and trigger seems to make the problem go away.

Answer 1

In your trigger, did you mean to put EXISTS after IF? Like this:

CREATE TRIGGER `lms`.`after_insert_into_leads`
AFTER INSERT ON `sets` FOR EACH ROW
BEGIN
IF EXISTS (SELECT * FROM sets WHERE on_off=0 LIMIT 1) THEN
CALL lms.leads_to_bak();
END IF;
END$$