其他解决方案相比情况下

我有一个Firebird数据库和此查询：其他解决方案相比情况下

select distinct 
case 
    when exists (select * from fixvar 
       where costtype_id=7 and extract(year from ct_from)<=2017 and 
       2017<=extract(year from ct_to) and costcenter_id=10) 
    then (select fix from fixvar where costtype_id=7 and extract(year from ct_from)<=2017 and 
       2017<=extract(year from ct_to) and costcenter_id=10) 
    else (select fix from fixvar where costtype_id=7 and extract(year from ct_from)<=2017 and 
       2017<=extract(year from ct_to)) 
end as fix, 
case 
    when exists (select * from fixvar 
       where costtype_id=7 and extract(year from ct_from)<=2017 and 
       2017<=extract(year from ct_to) and costcenter_id=10) 
    then (select var from fixvar where costtype_id=7 and extract(year from ct_from)<=2017 and 
       2017<=extract(year from ct_to) and costcenter_id=10) 
    else (select var from fixvar where costtype_id=7 and extract(year from ct_from)<=2017 and 
       2017<=extract(year from ct_to) and costcenter_id=10) 
end as var 
from fixvar

我得到正确的结果，但我可以做短？我想查询fix和var。如果有一行，其中costcenter_id是10，那么我想要相应的fix和var的值，如果不是，那么这些值就是我们没有的costcenter_id（-1）。

编辑：

的样本数据：

正如你看到的，有两排。所以，如果一行存在costcenter_id=10，那么我想要appr。 fix和var的值，如果没有这个costcenter_id的行，那么我想要fix和var的值，其中的costcenter_id=-1。

来源

2016-12-14 derstauner

样本数据和预期的结果将真正帮助解释你想要做什么。 –

[Firebird SQL挑战 - 在选择返回的两行时返回一行有数据]可能重复（http://stackoverflow.com/questions/14451183/firebird-sql-challenge-return-one-row-that-has -the-data-when-select-returned-t） – Serg

谢谢Serg，那是通过我的解决方案。 – derstauner

我想，我有解决方案：

select 
first 1 fix, var, costcenter_id 
from 
fixvar 
where 
costtype_id=7 
and 
2017 between extract(year from ct_from) and extract(year from ct_to) 
and 
costcenter_id in (-1, 10) 
order by costcenter_id desc

来源

2016-12-15 17:58:19 derstauner

其他解决方案相比情况下

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