替代WHERE子句中的多个concats？

Question

我有一个像这样的巨大查询:

SELECT 'Tipification', COUNT(*) TOTAL, to_char(INITDATE,'YYYY-MM-DD')
FROM (
    SELECT (TYPE || ' \ ' || SUBTYPE || ' \ ' || PROBLEM ) Triplet, INITDATE 
    FROM TABLE 
    WHERE USER IS NOT null 
        AND (INITDATE >= TO_DATE('2016-12-01 00:00', 'YYYY-MM-DD HH24:MI:SS')) 
        AND (INITDATE <= TO_DATE('2016-12-31 23:59', 'YYYY-MM-DD HH24:MI:SS')) 

        AND ( (TYPE || ' \ ' || SUBTYPE || ' \ ' || PROBLEM) = 'aaa \ bbb \ ccc' 
            OR (TYPE || ' \ ' || SUBTYPE || ' \ ' || PROBLEM) = 'aaa \ bbb \ ddd' 
            OR (TYPE || ' \ ' || SUBTYPE || ' \ ' || PROBLEM) = 'xxx \ yyy \ zzz' 
            OR (TYPE || ' \ ' || SUBTYPE || ' \ ' || PROBLEM) = 'qqq \ www \ eee'
            ... etc ...
)
GROUP BY to_char(INITDATE,'YYYY-MM-DD')

凡到更多的这300个字符串连接:(TYPE || ' \ ' || SUBTYPE || ' \ ' || PROBLEM) = '... \ ... \ ...'.

执行此查询时,我收到了一些核心转储,因为执行DB太昂贵了.

有没有其他方法可以执行这样的查询而不会让数据库耗尽内存？

Answer 1

Oracle有一个很好的in功能,允许你放入多列组合.

select to_char(INITDATE,'YYYY-MM-DD'), count(*)
from table
where user is not null
AND (INITDATE >= TO_DATE('2016-12-01 00:00', 'YYYY-MM-DD HH24:MI:SS')) 
AND (INITDATE <= TO_DATE('2016-12-31 23:59', 'YYYY-MM-DD HH24:MI:SS')) 
and (type, subtype, problem) in (
    ('aaa','bbb','ccc'),
    ('aaa','bbb','ddd')) --  ... etc
group by to_char(INITDATE,'YYYY-MM-DD')