Oracle/PLSQL: While Loop The syntax for the WHILE Loop is: WHILE condition LOOP {.statements.} END LOOP; 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...
Here’s the syntax for the WHILE loop statement: WHILE condition LOOP statements; END LOOP;Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) In this syntax, the condition is a boolean expression that evaluates to TRUE, FALSE or NULL. ...
PL/SQL WHILE LOOP语句 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_ou...
If the dataset is very large, consider processing it in smaller batches by adding a TOP clause to the INSERT INTO ##TempLinePatternSequence query and adjusting the loop logic accordingly. By following these optimizations, you should see a significant improvement in the performance of ...
Introduction to PL/pgSQL while loop statement The while loop statement executes one or more statements as long as a specified condition is true. Here’s the basic syntax of a while loop statement: [ <> ] while condition loop statements; end loop; In this syntax, PostgreSQL evaluates ...
FOR i IN 1..10 LOOP INSERT INTO table_name VALUES (...); END LOOP; 该INSERT语句会从PL/SQL引擎发送到SQL引擎10次。也就是说,会发生10次上下文其换。如果使用FORALL语句替换这个FOR循环,只需要发送一次INSERT语句,但是会执行10次。在这种情况下,在PL/SQL和SQL之间只会发生一次上下文切换。
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; ...
-- loop DECLARE v_num VARCHAR2(100); CURSOR c_num IS SELECT NAME FROM test_t WHERE ROWNUM < 600000; BEGIN dbms_output.enable(800000); OPEN c_num; LOOP FETCH c_num INTO v_num; EXIT WHEN c_num%NOTFOUND; --未找到数据 END LOOP; CLOSE c_num; END; -- while DECLARE v_num3 VARCH...
postgresql 游标遍历 while found loop plsql游标循环,一般情况下,数据要以一栏和明细的形式在画面上显示。这种程序相对会复杂一些。例如,首先有一行是部门的数据,在部门下方需要显示多行该部门的员工的信息。然后,再显示下一个部门的数据,再显示部门所属的员工信息;
ELSE和嵌套的IF语句循环控制语句LOOPWHILELOOP和FORLOOP错误处理–如果PLSQL在执行时出现异常则应该让程序在产生异常的语句处停下来根据异常的类型去执行异常处理语句–SQL标准对数据库服务器提供什么样的异常处理做出了建议要求PLSQL管理器提供完善的异常处理机制数据库系统概论PLSQL流程控制示例在SQLServer2005中新建查询执...