如果我有以下情况:
**table 1
person| money
A | 2
B | 10
-------------
**table 2
person| cars
A | 3
C | 10
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两者有什么区别?
SELECT * FROM table1 NATURAL LEFT OUTER JOIN table2;
产生:
person| money |cars
A | 2 |3
B | 10 |NULL
---------------
对比
SELECT * FROM table1 LEFT OUTER JOIN table 2 ON person