5: create table #table (empidint, empname varchar (25),Department varchar (25) ,Salaryint) 6: create clustered index #table_index1 on #table (empid asc ) 7: create nonclustered index #table_index2 on #table (Salary) include (Department,empid ) 8: insert into #table select S.empid,...
T-SQL获取数据库中的Table表结构信息,Column结构信息 Using OBJECT CATALOG VIEWS SELECT T.NAMEAS[TABLENAME], C.NAMEAS[COLUMNNAME], P.NAMEAS[DATATYPE], P.MAX_LENGTHAS[SIZE], CAST(P.PRECISIONASVARCHAR) +'/'+ CAST(P.SCALEASVARCHAR)AS[PRECISION/SCALE] FROM SYS.OBJECTSAST JOIN SYS.COLUMNSASCO...
本主题列出了 T-SQL 的外围应用以及本机编译 T-SQL 模块主体支持的功能,如存储过程 (CREATE PROCEDURE (Transact-SQL))、标量用户定义函数、内联表值函数和触发器。 有关本机模块定义的支持功能,请参阅对于本机编译的 T-SQL 模块支持的 DDL。 如需了解不支持构造的完整信...
TSQL–标示列、GUID 、序列 –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(‘TableNa...
通过某一约束条件 (ON table.XXX = table2.XXX) 进行关联,如果表中有至少一个匹配,则返回行,输出查询的字段。 SQL左链接 LEFT JOIN关键字返回左 表(表1)中的所有行,即使在右 表(表2)中没有匹配。如果在正确的表中没有匹配,结果是NULL。 代码语言:javascript ...
syntaxsql 複製 FROM { <table_source> [ , ...n ] } <table_source> ::= { [ database_name . [ schema_name ] . | schema_name . ] table_or_view_name [ AS ] table_or_view_alias [ <tablesample_clause> ] | derived_table [ AS ] table_alias [ ( column_alias [ , ...n ]...
SQL Server Getting started with SQL Server Index 'xp_cmdshell' does not exist?? "Exception has been thrown by the target of an invocation" and "Rule 'Setup administrator' failed" when installing SQL server 2016 "Invalid Object Name dbo.<table_name>" "is not a recognized built-in function...
SqlServer.TransactSql.ScriptDom Microsoft.SqlServer.TransactSql.ScriptDom AbortAfterWaitType AcceleratedDatabaseRecoveryDatabaseOption AddAlterFullTextIndexAction AddFileSpec AddMemberAlterRoleAction AddSearchPropertyListAction AddSensitivityClassificationStatement AddSignatureStatement AdHocDataSource AdHocTa...
You should get an error notifying you that SQL Server cannot use snapshot isolation to access table T1 in database testdb and that you should retry your transaction. The WAITFOR Command The WAITFOR command has been enhanced in several ways in Yukon. Besides waiting for a specified duration or...
SqlServer.TransactSql.ScriptDom Microsoft.SqlServer.TransactSql.ScriptDom AbortAfterWaitType AcceleratedDatabaseRecoveryDatabaseOption AddAlterFullTextIndexAction AddFileSpec AddMemberAlterRoleAction AddSearchPropertyListAction AddSensitivityClassificationStatement AddSignatureStatement AdHocDataSource AdHoc...