Question

我的数据是这样的：

data1_qqq_no_abc_ccc
data1_qqq_abc_ccc
data2_qqq_no_abc_ccc
data2_qqq_abc_ccc
data3_qqq_no_abc_ccc
data4_qqq_no_abc_ccc
data4_qqq_abc_ccc

...

现在，我想获取其中数据具有子字符串_no_abc_ccc但没有_abc_ccc的字段。在上面的示例中，其data3

我正在尝试为其创建查询。大概是

select SUBSTRING_INDEX(name, 'abc', 1)  
from table1 
where SUBSTRING_INDEX(name, 'abc', 1) not LIKE "%no" 
  and NOT IN (select SUBSTRING_INDEX(name, '_no_abc', 1) 
              from table 
              where name LIKE "%no_abc");

Answer 1

类似这样的东西（？）

create table t (
    col text
);

insert into t
values
('data1_qqq_no_abc_ccc'),
('data1_qqq_abc_ccc'),
('data2_qqq_no_abc_ccc'),
('data2_qqq_abc_ccc'),
('data3_qqq_no_abc_ccc'),
('data4_qqq_no_abc_ccc'),
('data4_qqq_abc_ccc');

select f from (
    select SUBSTRING_INDEX(col, '_', 1) as f, SUBSTRING_INDEX(col, '_', -3) as s from t
) tt
group by f
having 
count(case when s = 'no_abc_ccc' then 1 end) > 0
and
count(case when s like '%qqq_abc%' then 1 end)  = 0

demo

带子查询的SQL查询

1 个答案: