IFEXISTS(SELECT*FROMsysobjectsWHEREname='student') --如果有同名的,删除 DROPTABLEtest1 GO CREATETABLEstudent ( tidintIDENTITY(1,1)NOTNULL, --tid,以种子1,增量1自增长,不可为空 tnamevarchar(20)NOTNULL, --姓名,20varchar类型长度,不可为空 tageintNOTNULLDEFAULT18CHECK(tage>0), --年龄,int型,...
IF EXISTS (SELECT * FROM sysobjects where name='bbsReply') DROP TABLE bbsReply CREATE TABLE bbsReply ( RID INT IDENTITY(1,1) NOT NULL, --自动编号,帖子编号 RtID INT NOT NULL, --主贴ID外健引用主贴表中的TID RsID INT NOT NULL, --版块ID外健引用版块表中的SID RuID INT NOT NULL, --...
CHARINDEX ( expression1 , expression2 [ , start_location ] ) --返回字符串中指定表达式的起始位置,没有返回0 PATINDEX ( '%pattern%' , expression ) -- 返回指定表达式中某模式第一次出现的起始位置;如果在全部有效的文本和字符数据类型中没有找到该模式,则返回零。 REPLICATE ( character_expression , i...
T-SQL语法 ---创建数据库--- usemaster go ifexists(select*fromsysdatabaseswherename='库名') dropdatabase库名--删除数据库 createdatabase库名 onprimary ( name='库名_data', filename='路径:\库名_data.mdf', size=5mb, maxsize=100mb, filegrowth=15% ) logon ( name='库名_log', filename...
DROP TABLE IF EXISTS dbo.Emp; GO CREATE TABLE dbo.emp ( empid INT NOT NULL CONSTRAINT PK_emp_empid PRIMARY KEY, mgrid INT NULL CONSTRAINT FK_emp_empid REFERENCES dbo.emp, empname VARCHAR(25) NOT NULL, jobtitle VARCHAR(25) NOT NULL, ...
Index .NET Framework error occurred during execution of user-defined routine or aggregate "geography" 'IF EXISTS(SELECT COUNT(1))' VS 'IF EXISTS(SELECT 1) ' 'Incorrect syntax near' error while executing dynamic sql 'INSERT EXEC' within a function did not work 'Sort' in exuction plan is...
SELECT I.name as IndexName, -- Uncommnent line below to include checking for index exists as part of the script --'IF NOT EXISTS (SELECT name FROM sysindexes WHERE name = '''+ I.name +''') ' + 'CREATE ' + CASE WHEN I.is_unique = 1 THEN ' UNIQUE ' ELSE '' END + I.typ...
专用SQL 池支持的 T-SQL 语言元素的相关文档的链接。 核心元素 批、流控制和变量 运算符 要匹配的通配符 位运算符 函数 事务 事务 诊断会话 CREATE DIAGNOSTICS SESSION 过程 SET 语句 后续步骤 有关更多参考信息,请参阅专用 SQL 池中的 T-SQL 语句和专用 SQL 池中的系统视图。
CreateApplicationRoleStatement CreateAssemblyStatement CreateAsymmetricKeyStatement CreateAvailabilityGroupStatement CreateBrokerPriorityStatement CreateCertificateStatement CreateColumnEncryptionKeyStatement CreateColumnMasterKeyStatement CreateColumnStoreIndexStatement CreateContractStatement CreateCredentialStatement Cre...
if ID and ID2 columns are key columns then you need to worry about that faulty Update Statement. Agree, those values aren't being changed but it create very expensive Query Plan. In Fact you should Compare the query Plan with and without mt.col1 = s.col1 , mt.col2 = s.col2 in ...