4000 今天写了一条把我两个月职业生涯学到的SQL知识全用上了的语句

select r.ENTERPRISE_ID,

       e.ENTERPRISE_NAME,

       e.ADDR,

       e.REPRESENT,

       l.LEVEL_NAME,

       e.eval_year enterprise_year,

       r.eval_year record_year,

       sum(DECR_SCORE) as SUM_DECR,

       (case

         when ((100 - sum(DECR_SCORE)) <= t.alarm_value and

              (100 - sum(DECR_SCORE)) > t.warning_value) then

          '预警'

         when ((100 - sum(DECR_SCORE)) <= t.warning_value) then

          '预警'

       end) type,

       t.warning_value,

       t.alarm_value

  from eece_credit_record r

 inner join eece_enterprise e

    on r.enterprise_id = e.enterprise_id

 inner join eece_level l

    on e.level_id = l.level_id

  join eece_set_threshold t

    on 1 = 1

 where e.eval_year = '2016'

   and r.eval_year = '2017'

 group by r.ENTERPRISE_ID,

          e.ENTERPRISE_NAME,

          e.ADDR,

          e.REPRESENT,

          l.LEVEL_NAME,

          e.eval_year,

          r.eval_year,

          t.warning_value,

          t.alarm_value
having(100 - sum(DECR_SCORE)) < t.alarm_value

看起来应该还是比较复杂   一会看看有没有办法优化