string str = "SELECT * FROM `air_window` left join `wind_measure_device` on air_window.wind_device_...
string str = "SELECT * FROM `air_window` left join `wind_measure_device` on air_window.wind_device_id=wind_measure_device.id ";
c#中写表关联 表达式对吗
正确的写法是啥样 求解惑
