1>ALTERTABLEtest_subNOCHECKCONSTRAINTmain_id_cons;2>go1>deletefromtest_main2>go(2行受影响)1>deletefromtest_sub2>go(2行受影响) 数据清理完毕后,恢复外键select'ALTER TABLE'+o.name+'CHECK CONSTRAINT'+fk.name+';'ASCommandfromsys.foreign_keys fkJOINsys.all_objects oON(fk.parent_object_id=o....
O:select ceil(-1.001) value from dual 3.取整(小) S:select floor(-1.001) value O:select floor(-1.001) value from dual 4.取整(截取) S:select cast(-1.002 as int) value O:select trunc(-1.002) value from dual 5.四舍五入 S:select round(1.23456,4) value 1.23460 O:select round(1.23456...
SQL Server 用來處理單一 SELECT 陳述式的基本步驟如下:剖析器會掃描 SELECT 陳述式,並將其分成數個邏輯單位,例如關鍵字、運算式、運算子和識別碼。 然後系統會建立查詢樹 (有時也稱為序列樹),描述將來源資料轉換成結果集所需格式的邏輯步驟。 查詢最佳化工具會分析可存取來源資料表的數種方式。 接著會選取一...
Here you will learn what is a foreign key and how to established a relationship between two tables using a foreign key in the SQL Server database. What is Foreign Key? The foreign key establishes the relationship between the two tables and enforces referential integrity in the SQL Server. Fo...
---FOREIGN KEY (列名) references 表名(列名) ---创建默认值 ---create default 默认值名 ---AS 常量 ---绑定 sp_bindefault "默认名","表名.列名" ---解除绑定 sp_unbindefault "表名.列名" -- use master if db_id ('info141')is not...
USE <database_name>; GO SELECT f.name AS foreign_key_name ,OBJECT_NAME(f.parent_object_id) AS table_name ,COL_NAME(fc.parent_object_id, fc.parent_column_id) AS constraint_column_name ,OBJECT_NAME (f.referenced_object_id) AS referenced_object ,COL_NAME(fc.referenced...
sql server 1.清空日志:DUMP TRANSACTION 库名 WITH NO_LOG 2.截断事务日志:BACKUP LOG 数据库名 WITH NO_LOG 3.收缩数据库文件(如果不压缩,数据库的文件不会减小) --收缩数据库 DBCC SHRINKDATABASE(database_name) --收缩指定数据文件,1是文件号,可以通过这个语句查询到: select * from sysfiles DBCC...
(SELECTnameFROMsys.asymmetric_keysWHEREasymmetric_key_id=@major_id)WHEN@class_desc ='SERVER'THEN(SELECTnameFROMsys.serversWHEREserver_id=@major_id)WHEN@class_desc ='SERVER_PRINCIPAL'THENSUSER_NAME(@major_id)WHEN@class_desc ='ENDPOINT'THEN(SELECTnameFROMsys.endpointsWHEREendpoint_id=@major_id)...
1.SELECT：用于从数据库表中检索数据。2.INSERT：用于向数据库表中插入新的数据。3.UPDATE：用于更新...
SQL Server List Foreign Keys – Version 1 SELECTPKTABLE_QUALIFIER=CONVERT(SYSNAME,DB_NAME()),PKTABLE_OWNER=CONVERT(SYSNAME,SCHEMA_NAME(O1.SCHEMA_ID)),PKTABLE_NAME=CONVERT(SYSNAME,O1.NAME),PKCOLUMN_NAME=CONVERT(SYSNAME,C1.NAME),FKTABLE_QUALIFIER=CONVERT(SYSNAME,DB_NAME()),FKTABLE_OWNER=C...