SQLForeignKeys以标准结果集的形式返回结果。 如果请求与主键关联的外键,则按FKTABLE_CAT、FKTABLE_SCHEM、FKTABLE_NAME和KEY_SEQ对结果集进行排序。 如果请求与外键关联的主键,则按PKTABLE_CAT、PKTABLE_SCHEM、PKTABLE_NAME和KEY_SEQ对结果集进行排序。 下表列出了结果集中的列。
SQL Server / Oracle / MS Access: CREATETABLEOrders ( OrderID intNOTNULLPRIMARYKEY, OrderNumber intNOTNULL, PersonID intFOREIGNKEYREFERENCESPersons(PersonID) ); To allow naming of aFOREIGN KEYconstraint, and for defining aFOREIGN KEYconstraint on multiple columns, use the following SQL syntax: ...
Returns the foreign keys that reference primary keys on the table in the linked server. Transact-SQL Syntax Conventions Syntax sp_foreignkeys [ @table_server = ] 'table_server' [ , [ @pktab_name = ] 'pktab_name' ] [ , [ @pktab_schema = ] 'pktab_schema' ] [ , [ @pktab_cata...
Gilt für: SQL ServerGibt die Fremdschlüssel zurück, die auf Primärschlüssel in der Tabelle auf dem Verbindungsserver verweisen.Transact-SQL-SyntaxkonventionenSyntaxsyntaxsql Kopie sp_foreignkeys [ @table_server = ] N'table_server' [ , [ @pktab_name = ] N'pktab_name' ] [...
ERROR1452 (23000): Cannot add or update a child row: a foreign key constraint fails (`test`.`subtb`, CONSTRAINT `subtb_ibfk_1` FOREIGN KEY (`rootid`) REFERENCES `roottb` (`id`) ON DELETE CASCADE) mysql> FOREIGN KEY reference UNIQUE KEY not primary ...
To set the foreign key to trusted, use the following script to trust the foreign key constraint again, noting the additional WITH CHECK syntax. Copy and paste the following example into the query window and select Execute. SQL Copy ALTER TABLE [Purchasing].[PurchaseOrderHeader] WITH CHECK ...
P_Id int FOREIGN KEY REFERENCES Persons(P_Id) )To allow naming of a FOREIGN KEY constraint, and for defining a FOREIGN KEY constraint on multiple columns, use the following SQL syntax:MySQL / SQL Server / Oracle / MS Access:CREATE TABLE Orders ( O_Id int NOT NULL, OrderNo int NOT NU...
然后再设置外键约束: SET FOREIGN_KEY_CHECKS=1; 2. MySQL 5.1.48 导入 MySQL 5.7.18 时遇到 T FOREIGN_KEY_CHECKS = 0 错误的解决方法 #1064 – You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘T FOREIGN...
In addition, MySQL 9.2 allows implicit references to the parent table's primary key. This means that the following syntax is valid: CREATE TABLE person ( id SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT, name CHAR(60) NOT NULL, PRIMARY KEY (id) ); CREATE TABLE shirt ( id SMALLINT UNSIGNED...
然后再设置外键约束: SET FOREIGN_KEY_CHECKS=1; 2. MySQL 5.1.48 导入 MySQL 5.7.18 时遇到 T FOREIGN_KEY_CHECKS = 0 错误的解决方法 #1064 – You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘T FOREIGN...