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。
Example query See also Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) Warehouse in Microsoft Fabric SQL database in Microsoft Fabric Contains a row for each column, or set of columns, that comprise a foreign key. Ex...
Learn about primary and foreign key constraints, important objects used to enforce data integrity in database tables.
In SQL Server, this parameter contains the database name.[ @fktab_name = ] N'fktab_name'The name of the table with a foreign key. @fktab_name is sysname, with a default of NULL.[ @fktab_schema = ] N'fktab_schema'The name of the schema with a foreign key. @fktab_...
TRUNCATE TABLE (Transact-SQL) - SQL Server | Microsoft Learn Additionally, your command for disabling the checks isn't helping because that will only impact the tables containing the foreign key definitions, not the table you're trying to truncate. ...
Learn about primary and foreign key constraints, important objects used to enforce data integrity in database tables.
PRIMARYKEY(OrderID), FOREIGNKEY(PersonID)REFERENCESPersons(PersonID) ); SQL Server / Oracle / MS Access: CREATETABLEOrders ( OrderID intNOTNULLPRIMARYKEY, OrderNumber intNOTNULL, PersonID intFOREIGNKEYREFERENCESPersons(PersonID) ); To allow naming of aFOREIGN KEYconstraint, and for defining aFOR...
A foreign key relationship involves a parent table that holds the initial column values, and a child table with column values that reference the parent column values. A foreign key constraint is defined on the child table. This following example relates parent and child tables through a single...
If there are several rows in the parent table with the same referenced key value, InnoDB performs a foreign key check as if the other parent rows with the same key value do not exist. For example, if you define a RESTRICT type constraint, and there is a child row with several parent ...
SQL QuizSQL FOREIGN KEY Constraint« Previous Next Chapter » SQL FOREIGN KEY ConstraintA FOREIGN KEY in one table points to a PRIMARY KEY in another table.Let's illustrate the foreign key with an example. Look at the following two tables:The "Persons" table:P...