我有一张桌子:
num type flag
--- ---- ----
11 A 1
12 A 1
13 A 1
14 A 1
15 A 1
12 B 2
13 B 2
如何编写查询以获得以下结果:
num type flag
--- ---- ----
11 A 1
14 A 1
15 A 1
答案 0 :(得分:2)
select num
from your_table
where num not in
(
select num
from your_table
where type = 'B'
)
答案 1 :(得分:0)
尝试使用not exists
,如下所示
select *
from tab t
where t.type = 'A'
and not exists
(
select 1
from tab t1
where t1.type = 'B'
and t1.num=t.num
)