1) Simple PL/SQL WHILE loop example The following example illustrates how to use the WHILE loop statement: DECLARE n_counter NUMBER := 1; BEGIN WHILE n_counter <= 5 LOOP DBMS_OUTPUT.PUT_LINE( 'Counter : ' || n_counter ); n_counter := n_counter + 1; END LOOP; END; Code languag...
译:当你不确定循环体有多少次的时候,可以使用WHILE LOOP。因为在进入循环以前,WHILE的条件是先给的,因为可能循环体不止执行一次。 Let's take a look at an example: WHILE monthly_value <= 4000 LOOP monthly_value := daily_value * 31; END LOOP; In this example, the WHILE Loop would terminate on...
dropprocedureifexistsp_while_do;createprocedurep_while_do()begindeclareiint;seti=1;whilei<=10doselectconcat('index :', i);seti=i+1;endwhile;end; call p_while_do(); FOR LOOP dropprocedureifexistsp_for_loop;createprocedurep_for_loop()begindeclareiint;seti=1; loop_example : loopselectco...
下面我们来看一个简单的示例来演示如何在MySQL中实现循环执行一条SQL语句: DELIMITER//CREATEPROCEDUREloop_example()BEGINDECLAREiINTDEFAULT0;DECLAREmax_countINTDEFAULT10;WHILEi<max_countDO-- 需要循环执行的SQL语句SELECTCONCAT('This is iteration ',i);SETi=i+1;ENDWHILE;END//DELIMITER; 1. 2. 3. 4. ...
for_loop_statement Whereas the number of iterations through aWHILEloop is unknown until the loop completes, the number of iterations through aFORloop is known before the loop is entered. NumericFORloops iterate over a specified range of integers. The range is part of an iteration scheme, which...
Hi, We are using the below query to iterate through all the records and then increment a date as follows: WHILE ( @TempStartDate <= @endDateTime ) BEGIN WHILE (@RowNo < = @Tot_Count) BEGIN Print @TempStartDate …
WHILE LOOP文 カーソルFORLOOPの詳細は、「カーソルFOR LOOP文による問合せ結果セットの処理」を参照してください。 4.2.1基本LOOP文 基本LOOP文の構造は、次のとおりです。 [label] LOOPstatementsEND LOOP [label]; ループが反復されるたびにstatementsが実行され、制御がループの先頭に戻ります。
A. Use BREAK and CONTINUE with nested IF...ELSE and WHILE In the following example, if the average list price of a product is less than $300, theWHILEloop doubles the prices and then selects the maximum price. If the maximum price is less than or equal to $500, theWHILEloop restarts...
Example 2-49 Equivalent BOOLEAN Expressions 代码语言:javascript 代码运行次数:0 运行 AI代码解释 DECLAREdoneBOOLEAN;BEGIN--TheseWHILEloops are equivalentdone:=FALSE;WHILEdone=FALSELOOPdone:=TRUE;ENDLOOP;done:=FALSE;WHILENOT(done=TRUE)LOOPdone:=TRUE;ENDLOOP;done:=FALSE;WHILENOTdoneLOOPdone:=TRUE;END...
sql server里有循环语句，在sqlserver 数据库中，循环语句是最常用的语句之一，比如：SQL循环语句 declare @i int set @i=1 while @i<30 begin insert into test (userid) values(@i)set @i=@i+1 end while 条件 begin 执行操作 set @i=@i+1 end WHILE 设置重复执行 SQL 语句或语句块的...