Drop foreign key mysql

Foreign key mySql

CREATE TABLE parent (
    id INT NOT NULL,
    PRIMARY KEY (id)
) ENGINE=INNODB;

CREATE TABLE child (
    id INT,
    parent_id INT,
    INDEX par_ind (parent_id),
    FOREIGN KEY (parent_id)
        REFERENCES parent(id)
        ON DELETE CASCADE
) ENGINE=INNODB;

Source: dev.mysql.com

Drop all foreign key constraints mysql

SET foreign_key_checks = 0;

Source: stackoverflow.com

Mysql remove foreign key constraint

ALTER TABLE jobs DROP FOREIGN KEY constraint_name

Mysql drop key

ALTER TABLE tbl_quiz_attempt_master
  DROP INDEX `PRIMARY`;

Source: stackoverflow.com

Drop foreign key mysql

ALTER TABLE table_name DROP FOREIGN KEY constraint_name

Source: tutorialspoint.com

Add column mysql with foreign key

ALTER TABLE `TABLE_NAME`
ADD COLUMN `COLUMN_NAME` BIGINT(20) UNSIGNED NULL DEFAULT NULL AFTER `AFTER_COLUMN_NAME`, 
ADD FOREIGN KEY `FOREIGN_RELATION_NAME`(`COLUMN_NAME`) REFERENCES `FOREIGN_TABLE`(`FOREIGN_COLUMN`)  ON UPDATE SET NULL ON DELETE SET NULL

Similar codes

1 vote143 views1 answer
Mariadb.service: main process exited, code=exited, status=1/failure
SQL
6 votes119 views4 answers
Delete table sqlite
SQL
0 vote133 views1 answer
Rollback to name in sql
SQL
2 votes152 views1 answer
Find column in all stored procedures sql server
SQL
0 vote137 views1 answer
Sql change column in existing table
SQL
3 votes123 views1 answer
Ms sql skip take
SQL
1 vote122 views2 answers
Mysql spring boot application.properties
SQL
10 votes130 views4 answers
SELECT FROM WHERE
SQL
2 votes153 views3 answers
Application.properties spring boot mysql
SQL
0 vote136 views2 answers
Null value in column violates not-null constraint
SQL