sql中join與left-join圖解區別

t1表內容以下：3d t2表內容以下：blog 下面來簡述join和left join/right join的區別：get inner joinit select * from t1 inner join t2 on t1.id = t2.id;class 公共部分的數據纔會被查詢出來；select left joinim select * from t1 left join t2 on t1.i

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