循环使用WHILE 比如 DECLARE @I INT SET @I=0 WHILE @I<10 BEGIN PRINT @I SET @I=@I+1 END 跳出循环有主要有2种 BREAK和RETURN 比如 DECLARE @I INT SET @I=0 WHILE @I<10 BEGIN PRINT @I BREAK END 这样就跳出循环了，也可以换成RETURN，RETURN会结束整个批查询的执行，BREAK仅仅跳出...
WHILE (@RowNo < = @Tot_Count) BEGIN Print @TempStartDate SET @DSQL = 'SELECT F1 FROM Evaluation.CalculatedLimits_' + CAST(@PlantLineMapId as varchar) + ' WHERE PROCESS = 2 AND TIMESTAMP = ' + '''+CONVERT(nvarchar(50), @TempStartDate,121)+''' SET @RowNo = @RowNo + 1 END ...
mssql备份数据库语句 更多内容 空语句 空语句在PL/SQL程序中,可以用NULL语句来说明“不用做任何事情”,即空语句。 空语句相当于一个占位符,可以使某些语句变得有意义,提高程序的可读性。 语法 空语句的用法如下: 1 2 3 4 5 6 7 8 9 DECLARE … BEGIN … IF ...
WHILE @Loop <= 100000 BEGIN Set @PRID = NewID() Set @PRDesc = ' PerformanceIssue - ' + Convert( Varchar(10),@Loop ) Insert Into PerformanceIssue Values (@PRID, @Loop, @PRDesc) Set @Loop = @Loop + 1 END 脚本成功执行后,数据就添加进去了。 用下面语句来看一下表的内容: Select PRID...
建议使用SELECT语句,或While Loop语句实现相同功能 子查询 注意子查询、临时表和表变量的使用 只返回出必须的列,不要包含与处理需求无关的列(*) 变量 变量赋值:请修改为SELECT TOP 1… 动态T-SQL处理语句中,如果涉及到变量,尽量使用sp_executesql,通过参数传递进行处理 ...
Since it is recursive and relies on previous data to generate the next set of results, MSSQL doesn't perform well with parallel execution. Using a Temp Table and While Loop: This approach proved to be slower than my current recursive query, which uses a CTE (Common Table Expression) with...
while@loop_time<=@max_ids begin select@file_bak_path=file_path from@temwhereids=@loop_time select@sql_cmd='dir'+@file_bak_path EXEC@proc_result=master..xp_cmdshell @sql_cmd,no_output /*系统存储过程xp_cmdshell返回代码值:0(成功)或1(失败)*/ ...
Any Transact-SQL statement or statement grouping as defined with a statement block. To define a statement block, use the control-of-flow keywordsBEGINandEND. BREAK Causes an exit from the innermostWHILEloop. Any statements that appear after theENDkeyword, marking the end of the loop, are execut...
You're trying to pass NT LAN Manager (NTLM) credentials from one service to another service on the same computer (for example: from IIS to SQL Server), but a failure occurs in the process.Add theDisableLoopbackCheck or BackConnectionHostNamesregistry entries. ...
DELETE (Transact-SQL) SELECT (Transact-SQL) UPDATE (Transact-SQL)Transact-SQL 語法慣例語法syntaxsql 複製 <join_hint> ::= { LOOP | HASH | MERGE | REMOTE } 引數{ LOOP |HASH |MERGE }指定查詢中的聯結應該使用迴圈、雜湊或合併。 使用 LOOP、 HASH或MERGE JOIN 會強制執行兩個數據表之間的特定...