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INNER LEFT RIGHT JOIN语句 Sql代码 CREATE TABLE `a` ( `a1` VARCHAR(10) DEFAULT NULL, `b1` VARCHAR(10) DEFAULT NULL, `c1` VARCHAR(10) DEFAULT NULL ) ENGINE=INNODB DEFAULT CHARSET=utf8 CREATE TABLE `b` ( `a2` VARCHAR(10) DEFAULT NULL, `b2` VARCHAR(10) DEFAULT NULL ) ENGINE=INNODB DEFAULT CHARSET=utf8 创建出表，表内数据如下： 
SQL语句执行结果图片在语句的下方 Sql代码 #inner join SELECT A.*,B.* FROM a INNER JOIN B ON a.a1=b.a2 
Sql代码 #left join SELECT A.*,B.* FROM a LEFT OUTER JOIN b ON a.a1 = b.a2 
Sql代码 #right join SELECT A.*,B.* FROM a RIGHT OUTER JOIN b ON a.a1 = b.a2 
Sql代码 #full outer join union SELECT A.*,B.* FROM a LEFT OUTER JOIN b ON a.a1 = b.a2 UNION SELECT A.*,B.* FROM a RIGHT OUTER JOIN b ON a.a1 = b.a2 
Sql代码 SELECT A.*, B.* FROM A,B 
Sql代码 SELECT A.*,B.* FROM a JOIN b ON a.a1 = b.a2 默认是inner join
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