You would use a WHILE Loop when you are not sure how many times you will execute the loop body. Since the WHILE condition is evaluated before entering the loop, it is possible that the loop body maynotexecute e
只要给定条件为真,PL/SQL编程语言中的WHILE LOOP语句重复执行目标语句。 语法 WHILE LOOP语句的语法如下 - WHILEconditionLOOP sequence_of_statementsENDLOOP; 示例 以下是有关WHILE LOOP语句的应用示例 - SETSERVEROUTPUTONSIZE1000000;DECLAREa number(2) :=10;BEGINWHILE a<20LOOP dbms_output.put_line('value o...
PL/SQL WHILE loop examples Let’s take some examples of using the WHILE loop statement to see how it works. 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_...
2、WHILE...LOOP结构 WHILE...LOOP结构和基本的LOOP语句不同,它本身可以结束LOOP循环。WHILE关键词后面需要有布尔表达式,当WHILE后面的布尔表达式为TRUE时,则循环体重的语句序列被执行1次,然后会重新判断WHILE后面的表达式是否为TRUE,只有当WHILE后的布尔表达式为FALSE时,才结束整个LOOP循环。 该语句结构的相关语法如下:...
PL/SQL脚本语言循环loop for while的用法学习示例 (一)、循环学习 (a)、loop 循环 declare -- 求和变量 i变量 1.,。100 v_sum number(5); v_i number(5); begin v_sum :=0; v_i := 1; loop v_sum := v_sum + v_i; v_i := v_i+1; ...
1. PL/SQL中的流控制概述 2. IF语句的基础用法 3. 复杂条件判断:IF...ELSIF...ELSE结构 4. 条件组合判断 5. 循环语句:LOOP结构 6. 条件判断与循环结合:实际应用示例 1. PL/SQL中的流控制概述 PL/SQL提供了丰富的流控制语句,用来对程序的执行流程进行控制。流控制语句可以分为两类:条件判断语句和循环语...
postgresql 循环插入多条数据 plsql中用循环进行查询,一,常见的循环--while循环procedureloop_while(start_valueinnumber,end_valueinnumber)iscurrent_valuenumber:=start_value;beginwhilecurrent_value<=end_valueloop
PL/SQL While Loop [ 21 exercises with solution ]1. Write a PL/SQL program to display the names of all countries.Click me to see the solution2. Write a PL/SQL program to display the job titles of all employees. Return a heading of job title....
PL/SQL FOR LOOP examples Let’s take some examples of using the FOR LOOP statement to understand how it works. Basic PL/SQL FOR LOOP example In this example, the loop index is l_counter, lower_bound is one, and upper_bound is five. The loop shows a list of integers from 1 to ...
PreviousPL/pgSQL CASE Statement NextPL/pgSQL While Loop Last updated on March 19, 2024 Was this page helpful? YesNo On this page Introduction to PL/pgSQL Loop statement PL/pgSQL loop statement examples 1) Basic PL/pgSQL loop example 2) Using a loop with a label 3) Nested loop ...