Statik Ve Mukavemet Mehmet Omurtag.pdfl

Statik Ve Mukavemet Mehmet Omurtag.pdfl

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Statik Ve Mukavemet Mehmet Omurtag.pdfl

Mehmet H.
statik mehmet omurtag mehmet omurtag.pdf
Q:

How to delete a column from a mysql table with a foreign key

How to delete a column from a mysql table that has a foreign key?
For example:
CREATE TABLE `test`.`test1` (
`id` INT NOT NULL,
`id1` INT NOT NULL,
`name` VARCHAR(45),
PRIMARY KEY(`id`),
FOREIGN KEY(`id1`) REFERENCES `test`.`test2`(`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

So if i delete the id2 column from table test2 i wish to get this error:
#1452 – Cannot delete or update a parent row: a foreign key constraint fails

I can only change the name of the column.

A:

Only modify the column, but have no default value… then, for the foreign key it will not match the default value so it will not give an error.
After that, you’ll just need to have the column empty, and when you’re removing the foreign key, you can remove that line.
mysql> create table test1(id int, id1 int, name varchar(45), primary key(id),
foreign key (id1) references test2(id));
mysql> drop table test2;
Query OK, 0 rows affected (0.00 sec)

mysql> alter table test1 modify column id1 int;
Query OK, 0 rows affected (0.00 sec)
Records: 0 Duplicates: 0 Warnings: 0

mysql> delete from test1;
Query OK, 0 rows affected (0.00 sec)

mysql> alter table test1 modify column id1 int;
Query OK, 0 rows affected (0.00 sec)
Records: 0 Duplicates: 0 Warnings: 0

mysql> select * from test1;
+—-+—-+——-+
| id | id1 | name |
+—-+—-+——-+
| 1 | | foo

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