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。
KEY_SEQ smallint Sequence number of the column in a multicolumn primary key. This field always returns a value. UPDATE_RULE smallint Action applied to the foreign key when the SQL operation is an update. SQL Server returns 0, 1, or 2 for these columns: ...
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: ...
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' ] [...
The goals of this task are: - make foreign-key support possible for any storage engine (which could handle it) via a combination of API calls and server handling. - support SQL standard syntax instead of InnoDB syntax. I use the abbreviation FK when discussing the child / referencing table...
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...
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 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 NULL, P_Id int, PRIMARY KEY (O_Id), CONSTRAINT...
Applies to: SQL Server 2016 (13.x) and later Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL database in Microsoft Fabric You can disable a foreign key constraint during INSERT and UPDATE transactions in SQL Server by using SQL Server ...
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...