问: In SQL Server , I got this error -> "There are no primary or candidate keys in the referenced table 'BookTitle' that match the referencing column list in the foreign key 'FK_BookCopy_Title__2F10007B'." I first created a relation called the
SELECT oSub.name AS [子表名称] , fk.name AS [外键名称] , SubCol.name AS [子表列名] , oMain.name AS [主表名称] , MainCol.name AS [主表列名] FROM sys.foreign_keys fk JOIN sys.all_objects oSub ON ( fk.parent_object_id = oSub.object_id ) JOIN sys.all_objects oMain ON ( fk.r
SELECT ROW_NUMBER() over(partition by a.yngrbsh order by a.SFRQ desc ) RN, c.' and a.LSH not in(select SFLSH from JB_NCZ_GW_ZZD b) 在结果中根据yngrbsh进行分组,然后可以取出RN等于1的数据.
1.Employees员工表 /** 创建Employees员工表 **/ USE TSQL2012 IF OBJECT_ID('dbo.Employees','U') IS NOT NULL DROP TABLE dbo.Employees CREATE TABLE dbo.Employees ( empid INT NOT NULL, firstname ) NOT NULL, lastname ) NOT NULL, hiredate DATE NOT NULL, mgrid INT NU
Sql Server: What is the benefit of using “Enforce foreign key constraint” when it's set to “NO”? 问 I know the purpose of "Enforce foreign key constraint" in RDBMS. But is there any benefit when it's set to "NO" ? 答 In normal production
主键约束 SELECT tab.name AS [表名], idx.name AS [主键名称], col.name AS [主键列名] FROM sys.indexes idx JOIN sys.index_columns idxCol ON (idx.object_id = idxCol.object_id AND idx.index_id = idxCol.index_id AND idx.is_primary_k