Question

我有三个具有以下结构的表：

sequence
cli
datetime
company

表格为orders_broadband orders_lines和orders_porting

我想显示同一结果集中所有三个表的结果。

我试过运行查询：

SELECT orders_broadband.*, orders_lines.*, orders_porting.* from orders_broadband, orders_lines, orders_porting

但我不认为我的查询正确

Answer 1

你可以这样做：

select sequence, cli, datetime, company from orders_broadband
union all
select sequence, cli, datetime, company from orders_lines
union all
select sequence, cli, datetime, company from orders_porting

这将合并来自所有3个表的数据。

通过添加列名明显（类似于评论部分中提到的xQbert）

进行编辑

显示表格名称

select sequence, cli, datetime, company, 'Tablename1' as tbl from orders_broadband where status = 'New' 
UNION ALL 
select sequence, cli, datetime, company, 'Tablename2' as tbl from orders_lines where status = 'New' 
UNION ALL 
select sequence, cli, datetime, company, 'Tablename3' as tbl from orders_porting where status = 'New'

将'Tablename1'和其他人更改为您觉得舒服的任何内容。

如果我想从orders_broadband添加其他列，该怎么办？

select '' as telephone_number, sequence, cli, datetime, company, 'Tablename1' as tbl from orders_broadband where status = 'New' 
UNION ALL 
select '' as telephone_number, sequence, cli, datetime, company, 'Tablename2' as tbl from orders_lines where status = 'New' 
UNION ALL 
select telephone_number, sequence, cli, datetime, company, 'Tablename3' as tbl from orders_porting where status = 'New'

SQL从具有相同列名的3个表中进行选择

1 个答案: