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...
Oracle数据库中还提供了其他循环结构,如FOR循环和LOOP循环。 FOR循环: 语法更简洁,通常用于固定范围内的迭代。 自动处理循环变量的初始化和递增。 示例: sql DECLARE i NUMBER; BEGIN FOR i IN 1..5 LOOP DBMS_OUTPUT.PUT_LINE('i: ' || i); END LOOP; END; / LOOP循环: 无限循环,通常与EXIT WH...
oracle数据库 PLSQL数据库管理工具 方法/步骤 1 GOTO用法，以下是SQL源码：DECLARE x number;BEGIN x := 0; <<repeat_loop>> --循环点 x := x + 1; DBMS_OUTPUT.PUT_LINE(X); IF x < 9 THEN --当x的值小于9时,就goto到repeat_loop GOTO repeat_loop; END IF;END;2 FOR循环用法，以下是SQL...
WHILE condition LOOP sequence_of_statements END LOOP; 1. 2. 3. 示例 DECLARE v_count NUMBER(5):=11; v_num NUMBER(10):=200; BEGIN while v_count < 20 LOOP INSERT INTO T_TEST(T_TEST."id",T_TEST."num") VALUES(v_count,v_num); v_count:= v_count + 3; v_num:= v_num + 10...
Oracle中的三种循环(For、While、Loop) from:http://jingyan.baidu.com/article/c275f6ba38036ae33c756773.html GOTO用法,以下是SQL源码: DECLARE x number;BEGIN x := 0; <<repeat_loop>> --循环点 x := x + 1; DBMS_OUTPUT.PUT_LINE(X); IF x < 9 THEN --当x的值小于9时,就goto到repeat_...
PUT_LINE('逗号数量:' || SIGNS); --赋最大值 SI_MAX := SIGNS; --循环拼接SQL WHILE SIGNS > 0 LOOP --取当前字段 SELECT SUBSTR(STR,1,INSTR(STR,',') - 1 ) INTO CURRENT_VALUE FROM DUAL; --在待拼接的字段里删除当前字段 SELECT SUBSTR(STR,INSTR(STR,',') + 1) INTO STR FROM DUAL...
PL/SQL evaluates the condition in the WHILE clause before each loop iteration. If the condition is TRUE, then the loop body executes. If the condition is FALSE or NULL, the loop terminates. If the condition is FALSE before entering the loop, the WHILE loop does not execute at all. This...
Oracle中的三种循环(For、While、Loop) GOTO用法,以下是SQL源码: DECLARE x number;BEGIN x := 0; <<repeat_loop>> --循环点 x := x + 1; DBMS_OUTPUT.PUT_LINE(X); IF x < 9 THEN --当x的值小于9时,就goto到repeat_loop GOTO repeat_loop; END IF;END;...
TARGET_RESULTS :=TARGET_RESULTS||') '||ALIAS||' ';--循环拼接关联SQLFORTEMPINDATA LOOP--给待拼接的字段赋值STR :=TEMP.ASSOCIATION;--在末端追加逗号,否则最后一个字符无法识别STR :=STR||',';--计算逗号数量SELECTREGEXP_COUNT(STR,',')INTOSIGNSFROMDUAL;--赋最大值SI_MAX :=SIGNS;--清空关联...
oracle中的loop与while循环 2015-12-19 18:29 −Oracle中loop语句会先执行一次循环,然后再判断“exit when”关键字后面的条件表达式的值是true还是false,如果是true,那么将退出循环,否则继续循环。 LOOP循环 语法如下loop plsql_sentence;exit when end_condit... ...