MySQL错误:无法创建表(错误号:121“写入或更新时存在重复键”) [英] MySQL Error: Can't create table (errno: 121 "Duplicate key on write or update")
问题描述
我使用MySQL Workbench为数据库生成图表和代码。
当我将代码放入phpMyAdmin时,显示错误(#1005-无法创建表 wypozyczalnia
。 wypozyczenie
(错误号:121在写入或更新))
问题出在哪里? :(
外键-表 wypozyczenie
:
CONSTRAINT符号
如果给出了CONSTRAINT符号子句,则符号值(如果使用),
在数据库中必须是唯一的。符号重复会导致
错误。如果没有给出该子句,或者在CONSTRAINT关键字后没有包含符号
,则将自动创建约束的名称
。
I use MySQL Workbench to generate diagram and code for database.
When I put code to phpMyAdmin, it show error (#1005 - Can't create table wypozyczalnia
.wypozyczenie
(errno: 121 "Duplicate key on write or update"))
Where is the problem? :(
Foreign Keys - table wypozyczenie
Error is from this part of code:
CREATE TABLE IF NOT EXISTS `wypozyczalnia`.`wypozyczenie` (
`id_wyp` INT NOT NULL,
`data_wyp` DATE NOT NULL,
`data_odd` DATE NOT NULL,
`id_samochod` INT NOT NULL,
`id_klient` INT NOT NULL,
`id_pracownik` INT NOT NULL,
`id_plac_wyp` INT NOT NULL,
`id_plac_odd` INT NULL,
`cena` INT NULL,
`kaucja` INT NULL,
PRIMARY KEY (`id_wyp`),
INDEX `id_klient_idx` (`id_klient` ASC),
INDEX `id_samochod_idx` (`id_samochod` ASC),
INDEX `id_placowka_idx` (`id_plac_odd` ASC),
INDEX `id_pracownik_idx` (`id_pracownik` ASC),
INDEX `id_plac_wyp_idx` (`id_plac_wyp` ASC),
CONSTRAINT `id_klient_klient`
FOREIGN KEY (`id_klient`)
REFERENCES `wypozyczalnia`.`klient` (`id_klient`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `id_samochod_samochody`
FOREIGN KEY (`id_samochod`)
REFERENCES `wypozyczalnia`.`samochody` (`id_samochod`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `id_placowka_placowka`
FOREI[...]
As the error message says: you must have used the same constraint name twice. The constraint may even be in a different table, since the constraint name must be unique in a database:
CONSTRAINT symbol
If the CONSTRAINT symbol clause is given, the symbol value, if used, must be unique in the database. A duplicate symbol results in an error. If the clause is not given, or a symbol is not included following the CONSTRAINT keyword, a name for the constraint is created automatically.
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