SQL从3个具有相同列名的表中选择

Question

我有三个具有以下结构的表：

sequence
cli
datetime
company

该表是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

这将合并所有3个表中的数据。

通过显式添加列名进行编辑（类似于注释部分中提到的xQbert）

显示表名

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”和其他名称更改为您认为合适的名称。

如果要从orders_broadband添加其他列怎么办？

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'