Question

有没有办法使用plsql以降序迭代游标？

我试过了：

FOR item IN REVERSE items 
LOOP  
-- do stuff
END LOOP;

但它似乎忽略了反向关键词。

有什么建议吗？

Answer 1

SQL子句确定遍历数据的顺序，因此只需在查询中应用适当的ORDER BY。

Answer 2

DECLARE
cursor c1 is Select * FROM table_1
where (something)
order by (id..whatever you want) DESC; --decrement
v_variable.table%rowtype;
BEGIN
open c1;

fetch c1 into variable; -- will fetch  first row...but it will be DESC

close c1;

END;

那样的...... OR

FOR i1 IN c1
LOOP
i1.id...
something...
END LOOP;

OR

FOR i2 IN (Select * FROM table_1
    where (something)
    order by (id..whatever you want) DESC) 
LOOP
--something
END LOOP;

Answer 3

由于您没有任何要订购的列，请尝试使用rownum的订单

用于循环plsql的反转游标

3 个答案: