Question

我正在尝试使用以下字母m，f，i，c选择列paxtype中每个值的总数，但我的错误是sql未正确结束

(select b.PAXTYPE from xxxx b, xxx a)
(case b.PAXTYPE
    when 'M' then count('M')
    when 'F' then count('F')
    when 'I' then count('I')
    when 'C' then count('C')
    END)
where a.date_key=to_char(b.FLIGHTDATE,'RRRRMMDD')
and a.FLTNUM_KEY= trim(substr(b.flightnumber,3))
and a.origin=b.frm
and a.destination=b.too
--and a.date_key=20170801
--and fightnumber = '100'
and trim(a.cancelled) is null
and rownum = 1
)

Answer 1

首先，您没有使用正确的sql语法。此外，您的查询还有其他几个问题。

表名应位于select。
您需要使用group by，因为您需要count
无需CASE阻止

为什么需要ROWNUM = 1？

此查询应该可以满足您的要求。

SELECT b.PAXTYPE, COUNT (b.PAXTYPE)
          FROM xxxx b, xxx a
         WHERE     a.date_key = TO_CHAR (b.FLIGHTDATE, 'RRRRMMDD')
               AND a.FLTNUM_KEY = TRIM (SUBSTR (b.flightnumber, 3))
               AND a.origin = b.frm
               AND a.destination = b.too
               --and a.date_key=20170801
               --and fightnumber = '100'
               AND TRIM (a.cancelled) IS NULL
      --and rownum = 1  # Why was it required?
      GROUP BY b.PAXTYPE;

此外，如果您只需要M,F,I,C的计数，请在AND b.PAXTYPE IN ('M','F','I','C')之前添加group by

oracle SQL过程错误未正确结束

1 个答案: