Mysql查询获取每种类型的有限行

I have a Table in MYSql called companies and each companies has a type say type 1, type 2 type 3,

我在MYSql中有一个名为companies的表，每个公司都有一个类型1类型，类型2类型3，

example :

例子：

id   company_name   company_type
===============================
1    test1          3
2    xyz            2
3    ashdasdjk      2 
4    test 4         1 
5    test           3 
6    ahsdkjsg       1
7    TCS            2
and so on ...

now i want to write a query to fetch results such that i get 20 companies of type 1, 20 companies of type 2 and 20 companies of type 3... i mean i want to fetch maximum of 20 companies of each type

现在我想写一个查询来获取结果，这样我就可以得到20个类型1的公司，20个类型为2的公司和20个类型为3的公司...我的意思是我想要获取每种类型的最多20家公司

I am using Codeigniter..

我正在使用Codeigniter ..

1 个解决方案

#1

select * from (
    select
    c.*,
    @rn := if(company_type != @ct, 1, @rn + 1) as rownumber,
    @ct := company_type
    from
    companies c
    , (select @rn := 0, @ct := null) var_init
    order by
    company_type
) comp
where rownumber <= 20;