sql内连查询

select <查询的列名> from <表名>

inner join `<连接的表名称>`

on <第一张表的主键> = <第二张表的外键>

--没有先后顺序，下面依次类推，就接着inner join

--条件判断用where

例

select facilities.facilities_name,facilities.facilities_type from fitem

INNER JOIN `fitem`

ON fitem.villa_id = `villa_info`.villa_id

INNER JOIN `facilities`

ON facilities.facilities_id = `fitem`.facilities_id

where villa_info.villa_id=2