left join、right join和inner join區別
left join(左連接) 返回包括左表中的所有記錄和右表中聯結字段相等的記錄 right join(右連接) 返回包括右表中的所有記錄和左表中聯結字段相等的記錄 inner join(等值連接) 只返回兩個表中聯結字段相等的行 實例 A表（Order) B表(Customer) select * from order as o left join customer as c on o.cust
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