Oracle IF声明

Question

当我使用IF语句时，我有以下查询无效。当我只运行select语句时，它会给我我想要的结果。

我应该在此查询中更改哪些内容？

我愿意接受其他建议，例如使用＆＃39; CASE＆＃39;而不是＆＃39; IF＆＃39;如果那会更容易！

DECLARE
operacija VARCHAR2 := 'z';
BEGIN
IF operacija = 'z' THEN


(select (MIN_QUANT + (50/100) * MIN_QUANT) as MIN_QUANT, 
        (OPT_QUANT + (50/100) * OPT_QUANT) as OPT_QUANT,
        (MAX_QUANT + (50/100) * MAX_QUANT) as MAX_QUANT 
from my_table
where PRODUCT_CODE = '01' and CODE = '123' and FLAG = 'C');
END IF;

END;

谢谢。

Answer 1

您必须在变量中选择值，并在开始块之后为变量赋值，例如

DECLARE
   operacija     VARCHAR2(200);
   v_min_quant   NUMBER (20, 2);
   v_opt_quant   NUMBER (20, 2);
   v_max_quant   NUMBER (20, 2);
BEGIN
   operacija :='z';

   IF operacija = 'z'
   THEN
      SELECT (MIN_QUANT + (50 / 100) * MIN_QUANT),
             (OPT_QUANT + (50 / 100) * OPT_QUANT),
             (MAX_QUANT + (50 / 100) * MAX_QUANT)
        INTO v_min_quant, v_opt_quant, v_max_quant
        FROM my_table
       WHERE PRODUCT_CODE = '01' AND CODE = '123' AND FLAG = 'C';
   END IF;
END;