如何从文字列表中查询：从（'a'，'b'，'c'）中选择*

Question

我正在使用mysql 5.5 ，这是带有literal列表的左联接查询：

select tbl1.*, details.* 
from ('a', 'b', 'c'... 300+ elements) as 'tbl1' 
left join details
on 
details.id=tbl1.id

但这不起作用！

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''a','b')' at line 1

如何使此list作为表格？

Answer 1

使用UNION

select tbl1.*, details.* 
from (select 'a'as id
      union
      select 'b' as id
      union
      select 'c' as id
      union
      ...300) as tbl1
left join details
on 
details.id=tbl1.id

看到这个Fiidle逻辑

除了使用Subquery之外 ，您还可以先创建一个表tbl1作为

create table tbl1
(
id varchar(1)
)

insert into tbl1
select 'a' as id
union 
select 'b' as id
union 
select 'c' as id
....300

现在你可以使用表TBL的join

select tbl1.*, details.* 
from 'tbl1' 
left join details
on 
details.id=tbl1.id

Answer 2

子查询中缺少选择？

select tbl1.*, details.* 
    from (select 'a', 'b', 'c'... 300+ elements) as 'tbl1' 
    left join details
    on 
    details.id=tbl1.id

但是我不明白你的左联接应该做什么

[编辑]为您的联接创建一个临时表？

CREATE TEMPORARY TABLE TempTable ( tempcol varchar(100) ) ENGINE=heap; 

insert into TempTable
values ('a'), ('b'), ('c'), 300+ elements);

select TempTable.*, details.*
from TempTable
left join details on details.id = TempTable.tempcol;

Answer 3

select tbl1.*, details.* 
from (select 'a', 'b', 'c' as id) as tbl1
left join details
on 
details.id=tbl1.id