MySQL meldet: Dokumentation #1005 - Kann Tabelle `test_apptest`.`#sql-eb0_fd` nicht erzeugen (Fehler: 150 "Foreign key constraint is incorrectly formed") (Details…) In English: #1005 - Cannot create table `test_apptest`.`#sql-eb0_fd` (Error: 150 …) ...
MySQL foreign key support in database engines Laughing at myself here, there actually isn't too much to know. As of MySQL 5.x, InnoDB is the only MySQL database engine that supports foreign keys. (You might be able to use the foreign key syntax with other MySQL database engines, but ...
似乎每次打开连接时，都会设置一个新会话，因此，如果在单独的连接中使用这两种查询，它将无法工作。
First, click theinvoice_itemtable; notice that a red border indicates that this table is selected. Next, click theinvoicetable. This creates a foreign key in theinvoice_itemtable, the table on the“many”side of the relationship. This relationship between the two tables is shown graphically in...
constraint_name = KeyCol.constraint_name WHERE RefCons.constraint_schema = 'DATABASE_NAME'; Sample result The output of the SQL query: The above SQL script listed all foreign keys in the database, but what if you want to list all foreign keys for a specific table in the MySQL database...
You can always temporarily set the global system variable 'foreign_key_checks" off by command line before running database creating script. See example:http://www.hackyours.com/2014/01/import-mysql-dump-folder-with-script.html [19 May 2016 21:39] De Veloper ...
You can import the backup with the following lines. mysql >use databasename >SET FOREIGN_KEY_CHECKS = 0; >\. sqlscript.sql >SET FOREIGN_KEY_CHECKS = 1; Then your foreign keys will be properly restored. N.b. the fastes way to take a backup is with mysqldump --skip-opt --quick ...
when I have a table without an external key, just one drop table for delete table but if have constraint and use SET foreign_key_checks = 0; after of the query not work... error is Cannot delete or update a parent row: a foreign key constraint fails please help me I do not want...
SET FOREIGN_KEY_CHECKS=0; ALTER TABLE `currency` CHANGE COLUMN `id` `id` INT(11) NOT NULL, DROP PRIMARY KEY; ALTER TABLE currency ADD PRIMARY KEY (code); SET FOREIGN_KEY_CHECKS=1; MySQL throws the below exception: The query encountered an error while attempting to rename the database ...
What I did in the script already is to make all engines InnoDB by replacing the other names that existed, but no avail. The key fields are all of the type INT, and there no ON DELETE SET NULL command. I also changed the CHARACTER SET from latin1 to a coherent utf8 in the SQL scr...