在PL/SQL中可以使用LOOP语句对数据进行循环处理,利用该语句可以循环执行指定的语句序列。常用的LOOP循环语句包含3种形式:基本的LOOP、WHILE...LOOP和FOR...LOOP。 LOOP语句的基本语法结构如下: [<>]LOOPstatement...ENDLOOP[label_name]【语法说明】<>:LOOP结构的标签,是可选项。LOOP:LOOP循环开始标志。 statement...
LOOP:LOOP循环开始标志。 statement:LOOP语句中循环执行的语句序列。 END LOOP:LOOP循环结束标志,可以添加LOOP结构的标签。 1.基本的LOOP语句 实例:要求声明变量,每次循环都需要为变量增加数字1,并输出结果。当变量值大于3时,退出循环操作。 a、利用EXIT...WHEN结束循环操作。 SQL> set serveroutput on; SQL> --...
1[<>]WHILE boolean_expression2LOOP3statement...4END LOOP [label_name];5【语法说明】6boolean_expression:布尔表达式。7statement:语句序列,当boolean_expression为TRUE时,该语句序列可获得执行权。 c、WHILE...LOOP结构 1SQL> --while...loop2SQL>declare32 v_rlt number(8):=-3;43begin54 <<while_lo...
它还会使用 ITERATE 和 LEAVE 语句。 CREATE PROCEDURE ITERATOR() LANGUAGE SQL BEGIN DECLARE v_deptno CHAR(3); DECLARE v_deptname VARCHAR(29); DECLARE at_end INTEGER DEFAULT 0; DECLARE not_found CONDITION FOR SQLSTATE '02000'; DECLARE c1 CURSOR FOR SELECT deptno, deptname FROM department ORDER...
Introduction to PL/SQL FOR LOOP statement PL/SQL FOR LOOP executes a sequence of statements a specified number of times. The PL/SQL FOR LOOP statement has the following structure: FOR index IN lower_bound .. upper_bound LOOP statements; END LOOP;Code language: SQL (Structured Query Language...
Postgres on Neon provisions in 1 second. Get the free plan here. Summary: in this tutorial, you will learn about the PL/pgSQL loop statement that executes a block of code repeatedly. Introduction to PL/pgSQL Loop statement The loop defines an unconditional loop that executes a block of ...
MySQL provides loop statements that allow you to execute a block of SQL code repeatedly based on a condition. There are three loop statements in MySQL:WHILE,REPEATandLOOP. We will examine each statement in more detail in the following section. ...
Oracle LOOP循环控制语句,在PL/SQL中可以使用LOOP语句对数据进行循环处理,利用该语句可以循环执行指定的语句序列。常用的LOOP循环语句包含3种形式:基本的LOOP、WHILE...LOOP和FOR...LOOP。LOOP语句的基本语法结构如下:[<>]LOOPstatement...ENDLOOP[label_na
Summary: in this tutorial, you will learn about PL/SQL WHILE loop statement to execute a sequence of statements as long as a specified condition is TRUE. Introduction to PL/SQL WHILE loop statement PL/SQL WHILE loop is a control structure that repeatedly executes a code block as long as a...
FOR index IN low..high LOOP sql_statement; END LOOP; index是一个变量,low和high是范围。在每次循环中,index的值会逐渐增加,从low增加到high。在循环体中,可以通过index变量访问当前的循环次数。 例如,我们希望插入10行数据到一个名为numbers的表中。一个可能的for loop实现如下: ...