Question

我需要获取m_id = 2的最后插入值。我有两条m_id = 2的记录，其中Id为主键我需要max(id) m_id=2

例如

id m_id MName

2 2样本

3 2 sample1

我只需要获取Id=3的记录。我需要检查以下查询的MAX（id）

select a.*,b.MName,b.ZipCode,b.City,b.Address,b.email from insurance_details as a,insmemberdetails as b where b.id='2' and a.m_id='2'

Answer 1

使用ORDER BY ID DESC和LIMIT 1：

select a.*,b.MName,b.ZipCode,b.City,b.Address,b.email 
from insurance_details as a,insmemberdetails as b 
where b.id='2' and a.m_id='2'
order by b.id desc 
limit 1

Answer 2

您可以像这样使用它：

select a.*,b.MName,b.ZipCode,b.City,b.Address,b.email 
from insurance_details as a,insmemberdetails as b 
where a.m_id='2' order by b.id desc limit 1

你也可以这样使用它：

select a.*,b.MName,b.ZipCode,b.City,b.Address,b.email 
from insurance_details as a,insmemberdetails as b 
where b.id= (SELECT MAX(id) FROM b) and a.m_id='2'

Answer 3

尝试此查询： -

select a.*,b.MName,b.ZipCode,b.City,b.Address,b.email 
from insurance_details as a,insmemberdetails as b 
where b.id='2' and 
m_id = (SELECT MAX(m_id) FROM insurance_details)

希望它会对你有所帮助： - ）

获取特定约束的最后插入值

3 个答案: