使用PLSQL时，此SELECT语句中应有一个INTO子句 | 此SELECT语句中应有一个INTO子句

本文介绍了使用PLSQL时，此SELECT语句中应有一个INTO子句的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我收到以下错误.在SELECT CASE语句中获取错误.

I am getting the following error. Getting the error at SELECT CASE statement.

FOR REMS IN cur_names LOOP

SELECT CASE
        WHEN EXISTS (SELECT 1
                     FROM SupplyTable
                     WHERE FirstName = REMS.Names)
        THEN 'Y'
        ELSE 'N'
    END AS rec_exists
FROM dual;

  IF rec_exists = 'Y' THEN
    FName := REMS.Names;
  ELSE
    FName := 'Gen';
  END IF;
END LOOP;

推荐答案

您不能在pl sql代码中进行随机选择.它必须在带有into子句的循环中，游标中.只需在此处包括一个into子句即可.

you can´t have a random select inside your pl sql code. It must be in a loop, cursor, with an into clause. Just include an into clause here.

declare
   v_value varchar2(1);
begin
...
FOR REMS IN cur_names LOOP

   SELECT CASE
           WHEN EXISTS (SELECT 1
                        FROM SupplyTable
                        WHERE FirstName = REMS.Names)
           THEN 'Y'
           ELSE 'N'
       END AS rec_exists
   INTO v_value
   FROM dual;
   IF v_value = 'Y' THEN
      FName := REMS.Names;
   ELSE
      FName := 'Gen';
   END IF;
END LOOP;
...

或循环

FOR REMS IN cur_names LOOP

   for i in
   (
       SELECT CASE
           WHEN EXISTS (SELECT 1
                        FROM SupplyTable
                        WHERE FirstName = REMS.Names)
           THEN 'Y'
           ELSE 'N'
       END AS rec_exists
       FROM dual
   )
   loop
      IF i.rec_exists = 'Y' THEN
         FName := REMS.Names;
      ELSE
         FName := 'Gen';
     END IF;
   end loop;
END LOOP;

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