The FOR Loop can also loop in reverse. For example: 译:FOR循环也可以反向循环(这里就是计数器从高到低),如: FOR Lcntr IN REVERSE 1..15 LOOP LCalc := Lcntr * 31; END LOOP; This example will loop 15 times. The counter will start at 15 and end at 1. (loops backwards) 译:该示例...
The syntax for the FOR Loop is: FOR loop_counter IN [REVERSE] lowest_number..highest_number LOOP {.statements.} END LOOP; You would use a FOR Loop when you want to execute the loop body a fixed number of times. Let's take a look at an example. FOR Lcntr IN 1..20 LOOP L...
END LOOP; RETURN total_val; END; In this example, we've created a cursor called c1. TheCURSOR FOR Loopwill terminate after all records have been fetched from the cursor c1. 译:在这个示例中,我们建立了一个名为c1的cursor。当所有c1中的记录都取后,CURSOR FOR Loop就会终止。 再分享一下我老...
数据库Oracle变量定义异步控制结构体异常处理if-else语句循环控制while循环for循环loop循环语法规则 本视频主要介绍了编程中变量的定义、异步控制的语法结构,以及结构体和异常处理的相关概念。同时,详细讲解了if-else语句的使用,以及while循环、loop循环和for循环的语法规则和应用场景。通过实际案例演示了如何在控制台输出1到...
loop loop 语句序列 exit when 布尔表达式;end loop 先循环再判断退出条件,满足条件退出循环 while loop while 条件 loop 语句序列 end loop 先判断满足条件后再循环 for loop for 计数器 in [reverse] 低..高 loop 语句序列 end loop reverse为倒置,for 循环在plsql中没有步数 exit 当有两层循环时,exit写...
100 loop dbms_output.put_line(i); end loop; end; / 思考题:用PLSQL输出一个99口诀乘法表,大家可以先自己做,答案在下方。 ---用PLSQL输出99乘法表,循环套循环就可以完成--- begin for a in 1 .. 9 loop for b in 1 .. 9 loop dbms_output.put(' ' || a || ' * ' || b || ' =...
plsql中常见的loop循环 Integer for loop for i in 1..10 loop …. end loop; Implicit cursor loop for c in (select ) loop …. end loop; While loop i:=5; while i >10 loop i:=i+1; ... end loop; Basic loop i:=5; loop
For example,Oracle Forms applications frequently use SQL statements to test the values offield entries and do simple computations. By using PL/SQL instead of SQL, theseapplications can avoid calls to the database. 2.2 PL/SQL Unitsand Compilation Parameters ...
plsql内部正常运行DML(insert,delete,update),DQL(select, into )。 如果去运行DDL(create,truncate,drop)需要动态sql来执行。 动态sql不但可以在plsql中运行DDL,也可以运行DML,DQL 动态sql语法结构 execute immediate 'sql语句' [into 变量][using 绑定参数]...
游标是引用一个SQL的结果集,故游标只能是select 语句的结果集; 要处理多行数据必须定义游标; 游标必须和循环联合使用; declare cursor cur_emp is select * from emp; begin for x in cur_emp loop dbms_output.put_line(x.ename); end loop ;