Question

我正在使用mysql 5.5，这是一个带有literal列表的左连接查询：

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

但它不起作用！

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

如何将此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

请参阅 Fiidle Logic

您可以先创建一个表tbl1作为

，而不是使用子查询。

create table tbl1
(
id varchar(1)
)

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

现在您可以将表格tbl1 用于join

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

Answer 2

在您的子查询中缺少一个选择？

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

但我不明白你的左连接应该做什么

[编辑]为您的加入创建临时表？

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

如何从文字列表中查询：select * from（'a'，'b'，'c'）

3 个答案: