delete all entries in table mysql code example

Example 1: delete all records from table

DELETE FROM table_name;

Example 2: mysql delete entire row on condition

DELETE FROM table_name [WHERE Clause]

Example 3: delete all content in table mysql

TRUNCATE tablename

Example 4: sql delete where in

-- Deletes all records where `columnName` matches the values in brackets.
DELETE FROM tableName WHERE columnName IN ('val1', 'val2', 'val3');

Example 5: stored procedure to delete data from table in mysql

mysql> DELIMITER // ;
mysql> Create Procedure Delete_studentinfo ( IN p_id INT)
    -> BEGIN
    -> DELETE FROM student_info
    -> WHERE ID=p_id;
    -> END //
Query OK, 0 rows affected (0.11 sec)

mysql> DELIMITER ; //

Example 6: delete all tables from database mysql

DROP PROCEDURE IF EXISTS `drop_all_tables`;

DELIMITER $$
CREATE PROCEDURE `drop_all_tables`()
BEGIN
    DECLARE _done INT DEFAULT FALSE;
    DECLARE _tableName VARCHAR(255);
    DECLARE _cursor CURSOR FOR
        SELECT table_name 
        FROM information_schema.TABLES
        WHERE table_schema = SCHEMA();
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET _done = TRUE;

    SET FOREIGN_KEY_CHECKS = 0;

    OPEN _cursor;

    REPEAT FETCH _cursor INTO _tableName;

    IF NOT _done THEN
        SET @stmt_sql = CONCAT('DROP TABLE ', _tableName);
        PREPARE stmt1 FROM @stmt_sql;
        EXECUTE stmt1;
        DEALLOCATE PREPARE stmt1;
    END IF;

    UNTIL _done END REPEAT;

    CLOSE _cursor;
    SET FOREIGN_KEY_CHECKS = 1;
END$$

DELIMITER ;

call drop_all_tables(); 

DROP PROCEDURE IF EXISTS `drop_all_tables`;

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