This SQL Server tutorial explains how to use Foreign Keys in SQL Server with syntax and examples. A foreign key is a way to enforce referential integrity within your SQL Server database. A foreign key means that values in one table must also appear in an
WHERE C.CONSTRAINT_TYPE = 'FOREIGN KEY' SQL Server 2000 Version With SQL Server 2000 it is not as straight forward as using a simple SQL statement as shown above. In order to get this to work for SQL Server 2000 an adjustment was made to the sp_fkeys SP to cursor through all of th...
Else you will get a foreign key violation error. Foreign key constraints can reference tables within the same database in the same server. Foreign key constraints can be defined to reference another column in the same table. This is referred to as a self-reference. A foreign key constraint ...
You may have been in a scenario where you needed to quickly generate a script to drop and then subsequently re-create all of the foreign keys in a database (or in a specific schema, or matching a specific naming scheme). In some situations you can simply disable and re-enable the c...
However, in many real world applications referential integrity is not enforced since foreign keys remain disabled to ease data acquisition. Important applications such as anomaly detection, data integration, data modeling, indexing, reverse engineering, schema design, and query optimization all benefit ...
当任何 SQLForeignKeys 参数中存在无效值时, SQLForeignKeys 在执行时返回SQL_SUCCESS。 在这些参数中使用无效值时,SQLFetch 将返回SQL_NO_DATA。 可以在静态服务器游标上执行 SQLForeignKeys。 尝试对可更新的(动态或键集)游标执行 SQLForeignKeys 将返回SQL_SUCCESS_WITH_INFO指示游标类型已更改。 SQL Server Nati...
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USE<database_name>; GOSELECTOBJECT_DEFINITION (OBJECT_ID('<schema_name.object_name>'))ASObjectDefinition; GO TOP 如何实现查看服务器级触发器的定义? SQL SELECTdefinitionFROMsys.server_sql_modules; GO TOP 如何实现查找指定表的主键的列? 运行以下查询之前,请使用有效名称替换<database_...