Oracle inner join、left join、right join 、+左邊或者右邊的區別
爲了解釋這些問題，假設我們有一個表 t1 num | name
-----+------
1 | a
2 | b
3 | c 和 t2 num | value
-----+-------
1 | xxx
3 | yyy
5 | zzz 然後我們用不同的連接方式可以獲得各種結果： => SELECT * FROM t1 CROSS JOIN t2;
num
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