SQL查询仅根据列的值返回某些行

Question

我有一个类似于以下表格：

cycle | id    | name
------|-------|------
0     | 0012  | bob
s     | 0012  | bob
1     | 0012  | bob
0     | 6208  | sally
1     | 6208  | sally
0     | 3276  | jane
s     | 3276  | jane
1     | 3276  | jane
0     | 8736  | harry
s     | 8736  | harry

我需要一个查询，将导致：

cycle | id    | name
------|-------|------
s     | 0012  | bob
0     | 6208  | sally
s     | 3276  | jane
s     | 8736  | harry

因此，仅返回“循环”值为“ s”的行，除非特定“ id”没有“ s”的值，在这种情况下，它应返回“循环”值为“ 0”的行。

Answer 1

SELCET cycle, id, name from tbl1 as t1 where cycle='s' or 
(cycle=0 and (select count(cycle) from tbl1 as t2 where t2.id = t1.id and t2.cycle='s') <= 0)
group by t1.cycle,t1.id;