MySQL按分组，同时按列内容保留某些行
表中有重复的行。请参见第1行和第2行：MySQL按分组，同时按列内容保留某些行,mysql,sql,sql-order-by,Mysql,Sql,Sql Order By,表中有重复的行。请参见第1行和第2行： id full_name email status active 1 John Doe john@mail.com ok 1 2 John Doe john@mail.com null 1 3 Ricky Duke rick@mail.com null 1 4 Jane Doe jane@mail.com block 1
id full_name email status active
1 John Doe john@mail.com ok 1
2 John Doe john@mail.com null 1
3 Ricky Duke rick@mail.com null 1
4 Jane Doe jane@mail.com block 1
SELECT full_name, email
FROM `subscribers`
WHERE active = 1 AND (status = 'ok' OR status IS NULL)
GROUP BY email
我如何优先选择“状态”不为NULL的不同行，并仅在没有“确定”状态的行存在的情况下选择具有NULL的行？您可以使用
row\u number（）您可以使用
行编号（）您可以使用执行条件排序的相关子查询进行筛选，并为
nullselect t.*
from mytable t
where t.id = (
select id
from mytable t1
where
t1.full_name = t.full_name
and t1.email = t.email
and t1.active = t.active
order by status is null, status
limit 1
)
全名电子邮件活动您可以使用执行条件排序的相关子查询进行筛选，并为
nullselect t.*
from mytable t
where t.id = (
select id
from mytable t1
where
t1.full_name = t.full_name
and t1.email = t.email
and t1.active = t.active
order by status is null, status
limit 1
)
全名电子邮件活动