You would use aCURSOR FOR Loopwhen you want to fetch and process every record in a cursor. TheCURSOR FOR Loopwill terminate when all of the records in the cursor have been fetched. 译:当你每次想通过cursor来对每条记录进行取及操作时,就可以使用CURSOR FOR Loop。当cursor中所有的记录都取后,CUR...
方法1:游标循环(Cursor For Loops) 具体逻辑如下: 按一定顺序遍历时间date; where条件的时间范围为[本月第一天,date] 以date分组,这就把在这个时间范围内的数据聚合起来了 FORdateINlist_of_dates LOOP INSERTINTOfinal_table(date, revenue_mtd) SELECT@dateasdate,sum(revenue)asrevenue_mtd FROMsales WHEREsale...
You would use aCURSOR FOR Loopwhen you want to fetch and process every record in a cursor. TheCURSOR FOR Loopwill terminate when all of the records in the cursor have been fetched. 译:当你每次想通过cursor来对每条记录进行取及操作时,就可以使用CURSOR FOR Loop。当cursor中所有的记录都取后,CUR...
Summary: in this tutorial, you will learn how to use the PL/SQL cursor FOR LOOP statement to fetch and process every record from a cursor. Introduction to PL/SQL cursor FOR LOOP statement The cursor FOR LOOP statement is an elegant extension of the numeric FOR LOOP statement. The numeric...
BEGIN OPEN c_num3; FETCH c_num3 INTO v_num3; WHILE c_num3%FOUND LOOP -- 能找到数据则执行循环内语句 FETCH c_num3 INTO v_num3; END LOOP; CLOSE c_num3; END; -- for DECLARE v_num2 VARCHAR2(100); CURSOR c_num2 IS SELECT NAME FROM test_t WHERE ROWNUM < 600000; BEGIN dbms_...
**while** 条件表达式 loop 循环语句 end loop; 1. 2. 3. 4. 2.3简单应用 计算出1到100的和 **for实现:** for i in 1..100 loop i:=i+1; end loop **While实现:** while i<100 loop i:=i+1; end loop; 1. 2. 3. 4.
DECLARE C1 CURSOR FOR ---SELECT code,salary,city FROM employee WHERE city="Beijing"; OPEN C1; loop_label: LOOP - FETCH C1 INTO code_v,salary_v,city_v; --IF SQLCODE=0 THEN ---SET salary_v=salary_v*1.1; ---UPDATE employee SET salary=salary_v#p# ---WHERE...
Cursor For 是在 Cursor 基础上添加了 FOR 命令的一种操作形式。它可以让我们更方便地遍历结果集合,并对每一条记录执行相同的操作。通常情况下,Cursor For 会搭配 LOOP 命令一起使用,以实现对结果集合的循环处理。 Cursor For 示例 假设我们有一个名为Employee的表,其中包含了员工的信息,如员工编号(EmployeeID)...
游标通常与FOR循环一起使用。以下是一个示例,展示了如何在PL/SQL中使用游标和FOR循环: DECLARE CURSOR my_cursor IS SELECT column1, column2 FROM my_table; BEGIN FOR my_record IN my_cursor LOOP -- 在此处编写对每一行记录的操作 DBMS_OUTPUT.PUT_LINE('Value of column1: ' || my_record.column1)...
2 例二：使用LOOP循环 --- CREATE PROCEDURE TEST_LOOP LANGUAGE SQL BEGIN DECLARE code_v char(10); DECLARE salary_v integer; DECLARE city_v char(20);DECLARE C1 CURSOR FOR ---SELECT code,salary,city FROM employee WHERE city="Beijing"; OPEN C1; loop_label: LOOP ...