sql 各種 join的區別 left join,right join,inner join,full outter join
left join以左表爲主，同時顯示左右表的內容，右表不存在的字段顯示null right join以右表爲主，同時顯示兩個表的內容，左表不存在的字段顯示null inner join，只顯示符合條件的交集
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