执行此查询时缺少右括号

Question

Select a.*, 
when to_number(prem_term='annually')then to_number(prem_amt×1)
when to_number(prem_term='quaterly') then 
to_number(prem_amt×4)
when to_number(prem_term='semi annually') then 
to_number(prem_amt×2)Else end
From policy_holder a;

Answer 1

缺少CASE 和您希望在ELSE、多余且无效的TO_NUMBER 函数调用的情况下返回的值。也许你想要这样的东西：

SELECT a.*,
       CASE
          WHEN prem_term = 'annually'      THEN prem_amt * 1
          WHEN prem_term = 'quaterly'      THEN prem_amt * 4
          WHEN prem_term = 'semi annually' THEN prem_amt * 2
          ELSE NULL
       END
  FROM policy_holder a;