if exists(select * from sysobjects where name=约束名) alter table 表名 drop constraint 约束名; go alter table 表名 add constraint 约束名 check(约束规则),constraint 约束名 check(约束规则); go 示例: -- 添加一个默认约束 use testss; go if exists(select * from sysobjects where name='check1...
IF EXISTS (SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[Carl]') AND OBJECTPROPERTY(id, N'IsUserTable') = 1) DROP TABLE [dbo].[Carl] Create Table Carl ( InCarlID int --Unique --创建表时创建唯一约束 ) --在已有的表中创建唯一约束 Alter Table Carl Add Constraint UC...
alter table 表名 add constraint 约束名 check(约束规则),constraint 约束名 check(约束规则); go 示例: -- 添加一个默认约束 use testss; go if exists(select * from sysobjects where name='check1') alter table test1 drop constraint check1; go alter table test1 add constraint check1 check(height...
How to check if a table exists in any of the databases in a server ? For example, I want to see if a table called userAccountsBackup exists in any of the 25 databases in a server. How can I write a query to find this ?
We want to know if an index named ix_halp exists on the table agg.FirstNameByYear in theSQLIndexWorkbook database– now renamed to BabbyNames. It does! It was created with this code: CREATENONCLUSTEREDINDEXix_halpONagg.FirstNameByYear (ReportYear) ...
SQL Server/Oracle/MS Access: CREATE TABLE Persons ( P_Id int NOT NULL CHECK(P_Id>0), LastName varchar(255) NOT NULL, FirstName varchar(255), Address varchar(255), City varchar(255) ) 如需命名CHECK约束,并定义多个列的CHECK 约束,使用下面的SQL语法: ...
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SQL Query to return the data ? 1 SELECTTABLE_NAMEFROMDBName.INFORMATION_SCHEMA.TablesWHERETABLE_NAME='Article' How do I check this in C#? As for how you check that in C#? You just make sure the Row count returned from the query is 1. See this article I have already posted. ...
GetPropValueOptionalAllowNull(从SqlSmoObject继承。) GetRealValue(从SqlSmoObject继承。) GetScriptIncludeExists(从ScriptNameObjectBase继承。) GetScriptingOptionsForCreate(从SqlSmoObject继承。) GetServerNameGets the name of the instance of SQL Server with which the object is associated. (从SqlSmoObject继...
AclPermissionsFacet Checks if the SQL Server registry keys are consistent. P SQL Server registry keys are consistent and can support SQL Server installation or upgrade. Bids2008InstalledCheck Checks if any of SQL Server 2008 Business Intelligence Development Studio installation exists...