T-SQL – Add Column on a Existing Table with Default Value ALTER TABLE [dbo].[Team] ADD [TEAM_STADIUM] int NOT NULL DEFAULT(0)
The default value is 1.实例:PersonId int identity(1, 1), -- 或者通过修改表的方式加入 ALTER TABLE Person ADD PersonId INT IDENTITY(1,1); How to explicitly supply Values for Identity Column in SQL Server?#设置为可以手动插入Identity列
Can't add datetime column with default value in SQL Server 2005 Can't change the currente collate of my database Can't copy the result of a query? Can't declare table parameter as input to stored procedure Can't delete rows from Mgt Studio view Can't Enable Foreign Key Constraint (...
|column_nameAScomputed_column_expression }[, n] |[WITH CHECK | WITH NOCHECK]ADD {}[, n] |DROP {[CONSTRAINT]constraint_name |COLUMNcolumn }[, n] |{CHECK
–1. IDENTIY 列不能为空,不能设默认值,创建后不能使用ALTER TABLE TableName ALTER COLUMN修改,每张表只能有一个自增列 –2. 查看当前值:SELECT IDENT_CURRENT(‘TableName’), — 查看增量值:SELECT IDENT_INCR(‘TableName’) — 查看原始种子值:SELECT IDENT_SEED(‘TableName’),起始值, TRUNCATE TABL...
ADD CONSTRAINT UC_Categories UNIQUE (categoryname); GO Like the primary key constraint, the unique constraint automatically creates a unique index with the same name as the constraint. By default, the index will be nonclustered. SQL uses that index to enforce the uniqueness of the column or com...
value_columnPIVOT 运算符的值列。 与 UNPIVOT 一起使用时,value_column 不能是输入 table_source 中的现有列的名称。FOR pivot_columnPIVOT 运算符的透视列。 pivot_column 的数据类型必须可隐式或显式转换为 nvarchar()。 此列不能为 image 或 rowversion。使用UNPIVOT 时,pivot_column 是从 table_source 中...
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'用戶ID' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'E_CMS_Community_Statistics', @level2type=N'COLUMN',@level2name=N'UserId' ...
(index_value) |FORCESEEK [ ( index_value (index_column_name[,...] ) ] | |FORCESCAN |HOLDLOCK |NOLOCK |NOWAIT |PAGLOCK |READCOMMITTED |READCOMMITTEDLOCK |READPAST |READUNCOMMITTED |REPEATABLEREAD |ROWLOCK |SERIALIZABLE |SNAPSHOT |SPATIAL_WINDOW_MAX_CELLS =integer_value|TABLOCK |TABLOCKX |...
COLUMN INTERSECT SQLCODE COMMIT INTERVAL SQLERROR CONNECT INTO SQLSTATE CONNECTION IS SQLWARNING CONSTRAINT ISOLATION SUBSTRING CONSTRAINTS JOIN SUM CONTINUE KEY SYSTEM_USER CONVERT LANGUAGE TABLE CORRESPONDING LAST TEMPORARY COUNT LEADING THEN CREATE LEFT TIME CROSS LEVEL TIMESTAMP CURRENT...