Question

我想使用条件语句来确定要使用的查询条件集。对任何建议开放。目前我有

Select p.1, p.2, p.3, Count(p.3) ASDF
from table1 t1 
left join table2 t2 on t2.a = t1.a
inner join table3 t3 on t3.b = t1.b
where
    case t1.abc
        when 'x' then
            t2 in ('1111','2222')
    else t3.123 in ('asdf','qwer')

and t2.ad = '123'
and t1.bn = '456'
and t3.mk = '678'
group by p.1, p.2, p.3

我得到＆＃34;语法不正确＆＃34;第一个＆＃39; in＆＃39;和以下＆＃39;否则＆＃39;。我问的可能吗？如果没有，有什么好办法呢？

Answer 1

这应该可以按你的意愿运作：

SELECT p.1, p.2, p.3, COUNT(p.3) ASDF
FROM table1 t1 
LEFT JOIN table2 t2 
    ON t2.a = t1.a
INNER JOIN table3 t3 
    ON t3.b = t1.b
WHERE ((t1.abc = 'x' AND t2.somecolumn IN ('1111','2222'))
        OR t1.abc <> 'x' AND t3.123 in ('asdf','qwer'))
AND t2.ad = '123'
AND t1.bn = '456'
AND t3.mk = '678'
GROUP BY p.1, p.2, p.3

Answer 2

Select p.1, p.2, p.3, Count(p.3) ASDF
from table1 t1 
left join table2 t2 on t2.a = t1.a
inner join table3 t3 on t3.b = t1.b
where (t1.abc = 'x'AND t2 in ('1111','2222')) OR
      (t1.abc <> 'x' AND t3.123 in ('asdf','qwer'))

and t2.ad = '123'
and t1.bn = '456'
and t3.mk = '678'
group by p.1, p.2, p.3

用于选择要使用的查询条件的案例（或替代）语句

2 个答案: