如何为FIlter国家编写sql查询作为状态明智

Question

这里我有一个简单的表格。我想最终得到一张像给定的那样的桌子。编写sql语句来实现此目的的最佳方法是什么？

表1

 Id    Name           Approved
 1     Australia      3
 2     UAE            1
 3     India          2

表2

Id    Status
1     Submit
2     In-Progress
3     Pending

将结果显示为

Submitted    In-Progress     Pending
UAE           India         Australia

Answer 1

请尝试以下查询：

create table #country
(
    ID int identity(1,1),
    Name varchar(30),
    Approved int
)

create table #status
(
    ID int,
    Status varchar(30)
)

insert into #country (Name, Approved) values ('Australia',3), ('UAE',1), ('India',2)
insert into #status (ID, Status) values (1,'Submit'), (2, 'In-Progress'), (3,'Pending')

select Submit, [In-Progress],[Pending]
from (
    select t1.Name, t2.Status
    from #country t1
    inner join #status t2 on t1.Approved = t2.ID
)dd1
pivot (
    max(Name) for Status in ([Submit], [In-Progress],[Pending])
) piv

drop table #country
drop table #status

此查询的输出：

Answer 2

试试这个： -

select 
trim(replace(group_concat(submitted),',',' ')) as submitted, 
trim(replace(group_concat(InProgress),',',' ')) as InProgress,
trim(replace(group_concat(Pending),',',' ')) as Pending
from
(
Select 
case when status='Submit' then A.Name else ' ' end as submitted,
case when status='In-Progress' then A.Name else ' ' end as InProgress,
case when status='Pending' then A.Name else ' ' end as Pending

FROM

TABLE1 A
INNER JOIN
TABLE2 B
ON A.ID=B.ID
) a;

Answer 3

以下是给定数据的答案：

select `Submit`,`In-Progress`,`Pending` from
(select `Submit`,`In-Progress`,INP.id from
(select   Name as 'Submit',a.id  from
 (select * from table1)as a

LEFT JOIN 

  (select * from table2) as b
on a.Approvide = b.`Id` 
where b.`STATUS` = 'Submit') as Sub


INNER JOIN


(select   Name as 'In-Progress',a.id  from
 (select * from table1)as a

LEFT JOIN 

  (select * from table2) as b
on a.Approvide = b.`Id` 
where b.`STATUS` = 'In-Progress') as INP
on Sub.id != INP.id) as c


INNER JOIN


(select   Name as Pending,a.id  from
 (select * from table1)as a

LEFT JOIN 

  (select * from table2) as b
on a.Approvide = b.`Id` 
where b.`STATUS` = 'Pending') as Pen

on c.id != Pen.id

Answer 4

select Name,Status from Table1 natural join Table2;

这很简单。结果应该现在看起来像这样。我认为这是我们如何从多个表中实际检索信息的常用方法。

Name           Status

Australia      Pending
UAE            Submit
India          In-Progress

请考虑