LOOP:先执行再判断,至少执行一次; WHILE LOOP:先判断再执行,如果不满足条件,就不执行 FOR循环:已知要循环的次数. 如果明确知道循环次数,使用FOR循环; 如果不知道循环次数,但是知道循环结束条件,使用LOOP循环. 循环控制:EXIT与CONTINUE语句完成。 PL/SQL程序与其他编程语言一样,也拥有自己的三种程序结构:顺序结构
PL/SQL的FOR-LOOP循环分为如下两类: 数字FOR循环:在已知的循环次数内进行循环操作。 游标FOR循环:用来循环游标结果集。 数字FOR循环与LOOP和WHILE-LOOP循环的最大的不同在于,在循环开始前已经知道了循环的次数,因此称为数字FOR循环。 1.基本循环结构 FOR循环的声明语法如下所示: FOR loop index IN [ REVERSE ]...
I am not sure about DO-WHILE IN MS SQL Server 2008 but you can change your WHILE loop logic, so as to USE like DO-WHILE loop. 1) Example of WHILE Loop DECLARE@intFlagINTSET@intFlag=1WHILE (@intFlag<=5)BEGINPRINT@intFlagSET@intFlag=@intFlag+1ENDGO ResultSet: 1 2 3 4 5 2) Exampl...
“Unable to enlist in the transaction” with Oracle linked server from MS SQL Server [<Name of Missing Index, sysname,>] in non clustered index [Execute SQL Task] Error: The value type (__ComObject) can only be converted to variables of type Object. [ODBC Driver Manager] Data source nam...
Print @DSQL END the @tempStartDate variable is not parsing correctly in the 2nd loop which is not allowing to increment the date by 10 minutes. Please let me know whats going wrong or did i miss any step. Any help would be very much appreciated. ...
Sql server for-each或while行 SQL Server中没有直接的"for-each"或"while"行的概念。然而,可以使用不同的方法来实现类似的功能。 使用游标(Cursor):游标是一种用于遍历结果集的数据库对象。可以使用游标来逐行处理查询结果。游标提供了类似于"for-each"的功能。以下是一个示例: 代码语言:txt 复制 DECLARE @id...
SET SERVEROUTPUT ON; DECLARE total INTEGER := 0; BEGIN FOR i IN 1..100 LOOP total := total + i; END LOOP; dbms_output.put_line(total); END; / 解释: 在这个例子中,FOR语句使代码更加简洁。循环变量i从1开始,到100结束,每次循环都将i的值加到total中。循环结束后,total的值为5050,与WHIL...
运行pl/sql程序,得到结果 3.pl/sql中使用for循环 1SETserveroutputON;2DECLARE3--定义循环变量4pnumnumber:=1;5BEGIN6--循环条件7FORpnumIN1..10loop8dbms_output.put_line(pnum);9ENDloop;10END;11/ 运行pl/sql程序,得到结果
SQL database in Microsoft Fabric Sets a condition for the repeated execution of a SQL statement or statement block. The statements are executed repeatedly as long as the specified condition is true. The execution of statements in theWHILEloop can be controlled from inside the loop with theBREAK...
After reading this article you will understand the basics of using the WHILE statement to write a loop within a stored procedure. All the examples for this lesson are based on Microsoft SQL Server Management Studio and the sample databases AdventureWorks and WideWorldImporters. Start learning SQL ...