SELECT * INTO #Temp_Table FROM Students WHERE Id > 1; GO -- SELECT INTO 创建永久表 SQL Server 2016 (13.x) SP2 和更高版本。 IF OBJECT_ID(N'Temp_Table', N'U') IS NOT NULL DROP TABLE Temp_Table; GO -- 永久表查询 SELECT * INTO Temp_Table FROM Students WHERE Id > 1; GO --...
AI代码解释 ---Table structureforstudent---DROPTABLEIFEXISTS`student`;CREATETABLE`student`(`id`int(11)NOTNULLAUTO_INCREMENTCOMMENT'id',`sno`varchar(20)CHARACTERSETutf8COLLATEutf8_unicode_ciNULLDEFAULTNULLCOMMENT'学号',`sname`varchar(10)CHARACTERSETutf8COLLATEutf8_unicode_ciNULLDEFAULTNULLCOMMENT'学生...
);2.查看约束的定义信息--查看表的约束SQL>SELECTowner,constraint_name,constraint_type,table_name,status,deferrable,validatedFROMuser_constraintsORDERBYtable_name; OWNER CONSTRAINT_NAME C TABLE_NAME STATUS DEFERRABLE VALIDATED--- --- - --- --- --- ---ROBINSON SYS_C005543 C TB_CONSTRAINT_1 ENA...
SQL> ALTER TABLE tb_dept 2 DROP PRIMARY KEY CASCADE; --删除后可以看到不存在tb_dept主键约束及tb_cons2外键的记录 SQL> SELECT constraint_name,constraint_type,table_name,status,deferrable,validated 2 FROM user_constraints 3 ORDER BY table_name; CONSTRAINT_NAME C TABLE_NAME STATUS DEFERRABLE VALIDAT...
適用於:SQL ServerAzure SQL DatabaseAzure SQL 受控實例Microsoft Fabric 中的 SQL Database 您可以使用 SQL Server Management Studio 或 Transact-SQL 來刪除 SQL Server 中的檢查限制式。 刪除檢查條件約束會從條件約束運算式中移除一個或多個資料行所接受資料值的限制。 本主題內容 開始之前: 安全性 若要...
建立新的叢集索引可啟用先前停用的非叢集索引。 如需詳細資訊,請參閱Enable Indexes and Constraints。 如果資料表為堆積,則所有非叢集索引會重建。 權限 若要執行ALTER INDEX,至少需要資料表或檢視表的ALTER權限。 使用SQL Server Management Studio 停用索引 ...
sys.check_constraints chk JOIN sys.tables tab ON (chk.parent_object_id = tab.object_id) ---查找唯一约束 select * from sys.indexes idx where idx.is_unique_constraint = 1 SELECT tab.name AS [表名], AS [约束名称], AS [约束列名] FROM...
MySQL / SQL Server / Oracle / MS Access: ALTERTABLEPersonsADDCONSTRAINTuc_PersonIDUNIQUE(Id_P,LastName) 1. 2. 撤销UNIQUE 约束 如需撤销 UNIQUE 约束,请使用下面的 SQL: MySQL: ALTERTABLEPersonsDROPINDEXuc_PersonID 1. 2. SQL Server / Oracle / MS Access: ...
Drop all constraints in Database DROP ALL USERS FROM DATABASE Drop and Create Constraint on Very Large Table Drop and recreate table in stored procedure Drop Database Error Msg 3701, Level 11, State 1, Line 1 Drop or Truncate a particular partition. DROP Table - How to force a delete of...
For all installations of SQL Server, the default compatibility level is associated with the version of the Database Engine, as seen inthis table. For new development work, always plan to certify applications on the latest database compatibility level. ...