更新数据: UPDATE table_name SET column1 = value1, column2 = value2 WHERE condition; 删除数据: DELETE FROM table_name WHERE condition; 变量声明与使用: DECLARE @MyVariable INT; SET @MyVariable = 10; SELECT @MyVariable AS My
Declare@SearchTerm varchar(250); --What we're searching the DB for<br> Declare@vSQL varchar(550)=''; --Variable that will hold our dynamic queries<br> set@SearchTerm='LoadID';<br> selectname fromsys.databases whereowner_sid !=0x01; print @Dbname; set@vSQL ='use [' + @dbname +...
If a SELECT statement returns more than one row and the variable references a nonscalar expression, the variable is set to the value returned for the expression in the last row of the result set. For example, in this batch @EmpIDVariable is set to the EmployeeID value of the last row ...
项目中使用BIGINT来存放时间,以下代码用来转换时间类型和BIGINT类型 SETANSI_NULLSONGOSETQUOTED_IDENTIFIERONGO--===--Author: GGA--Create date: 2013-03-28--Description: 将时间类型转化成BIGINT,返回指定时间--到-01-01 08:00:00.000的毫秒数--===CREATEFUNCTION[dbo].[ufn_GetMSIntFormTime](@dtDATE...
为局部变量赋值,可以使用set和select。 set@variable_name=expression set一次只能给一个局部变量赋值。 select@variable_name=expression select 可以同时给一个或多个变量赋值。 若select语句中省略赋值号及后面的表达式,则可以将局部变量值显示出来,与print语句作用相同。
29 rpc_starting declare @p1 int set @p1=7 exec sp_prepexecrpc @p1 output,N'spTest',2,2 select @p1 66 2023-10-23 08:20:30.0829108 ''' import pyodbc connection_string = ' DRIVER={ODBC Driver 17 for SQL Server};SERVER=localhost;DATABASE=tempdb;UID=sa;PWD=xxxxxxxxxxxxx;...
How to find the number of times a view was used within SQL Server We are doing housekeeping in SQL Server and wanted to remove views that are no longer being used or needed. To ascertain this, we wanted to assess the frequency of various view usage within select statements, stored procedur...
3.局部变量的赋值方法使用DECLARE命令声明并创建变量之后，系统会将其初始值设为NULL，如果想要设定变量的值，必须使用SET命令或者SELECT命令。SET{{@local_variable=expression}或者 SELECT{@local_variable=expression}[,...n]其中：参数@local_variable是给其赋值并声明的变量，expression是有效的...
How can i select a max of column witch type is unique identifier how can i select all columns except one in sql server query How can i select the step count of a recursive CTE ? How can i set value of @variable inside with cte ? How can I treat ZERO and NULL the same in a WHE...
select * from ( merge into dbo.tar as t using dbo.src as s on =s.id --matched表示On子句匹配成功,加上额外的and条件,如果when子句成功,那么更新Targe表中的数据 when matched and <> then update set = --not matched表示On子句不匹配