其他解决方案比情况时

Question

我有一个firebird数据库和这个查询：

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

我得到了正确的结果，但我可以做得更短吗？

我想要的是：我想查询字段fix和var。如果有一行costcenter_id为10，那么我想要有相应的fix和var值，如果没有，那么我们要避开的值不是costcenter_id（ - 1）。

编辑：

示例数据：

如您所见，有两行。所以，如果costcenter_id=10存在一行，那么我想要appr。 fix和var值，如果此costcenter_id没有行，那么我想要fix和var值，其中costcenter_id=-1

Answer 1

我想，我有解决方案：

$('#prev').click(function () {
    pageNumber--;
    showPage(pageNumber);
    if($('#more').prop('disabled')) {
        $('#more').prop('disabled', false);
    }
});

$('#more').click(function () {
    pageNumber++;
    showPage(pageNumber);
    if($('#prev').prop('disabled')) {
        $('#prev').prop('disabled', false);
    }
});