Question

我无法在以下查询中使用if then语句：

define start_date = '&START_DATE'
define end_date   = '&END_DATE'
define co_cd      = '&COMPANY_CODE'
define myacct     = '&4_DIGIT_ACCOUNT'

select ivc.pmt_dt, ivc.ivc_cd, gl.seq#, gl.gl_acct_cd, ivc.ve_cd, ve.ve_name, gl.amt
from ivc ivc
  left outer join ve ve
    on ivc.ve_cd = ve.ve_cd
  left outer join ivc$gl_acct gl
    on (ivc.ivc_cd = gl.ivc_cd and ivc.ve_cd = gl.ve_cd)
where ivc.post_dt >= '&start_date'
  and ivc.post_dt <= '&end_date'
  and substr(gl_acct_cd,1,4) = '&myacct'
  and if '&co_cd' = 'BSD' then
        substr(gl_acct_cd,6,2) in ('04','08','11','31','37')
      elseif '&co_cd' = 'JEYE' then
        substr(gl_acct_cd,6,2) in ('03','20','21','22','23','24')
      elseif '&co_cd' = 'BSF' then
        --something
      elseif '&co_cd' = 'ALL' then
        --something
      else
        substr(gl_acct_cd,6,2) in '&co_cd'
      end if
order by gl.amt desc

我在If Then声明中做错了什么？我一直收到无效的关系运算符错误。我在线搜索了很多，但找不到答案。任何帮助表示赞赏。我知道这个东西很危险......做了很多sql查询，但它们通常不会太复杂。谢谢！

Answer 1

如果SQL是面向集合的，那么就没有像IF这样的过程方法。

相反，构建查询如下：

and (
  ('&co_cd' = 'BSD'  and substr(gl_acct_cd,6,2) in ('04','08','11','31','37')) or
  ('&co_cd' = 'JEYE' and substr(gl_acct_cd,6,2) in ('03','20','21','22','23','24')) or
  ('&co_cd' = 'BSF'  and --something) or
  ('&co_cd' = 'ALL'  and --something) or
  ('&co_cd' not in ('BSD','JEYE','BSF','ALL') and substr(gl_acct_cd,6,2) in '&co_cd'))

Answer 2

如果那么其他方法在SQL语句中不起作用，你应该使用CASE WHEN，但在你的情况下，case when不是一个好的选择试试这个

and (
      ('&co_cd' = 'BSD' and substr(gl_acct_cd,6,2) in ('04','08','11','31','37'))
      OR 
      ('&co_cd' = 'JEYE' and substr(gl_acct_cd,6,2) in ('03','20','21','22','23','24'))
      OR 
      ('&co_cd' = 'BSF' and --something)
      OR 
      ('&co_cd' = 'ALL' and --something)
      OR
      ('&co_cd' NOT IN ('BSD','JEYE','BSF', 'ALL') and substr(gl_acct_cd,6,2) in '&co_cd')
     )

Oracle SQL：在If Then语句中使用变量

2 个答案: