SQL语句中的Left Join、Right join、Inner Join 、Full Join关键字
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Left Join 关键字会在左表 (EMP) 那里返回所有的行，即使在右表 (SAL) 中没有匹配的行，例如：
select * from EMP Left join SAL on EMP.ENAME = SAL.ENAME;RIGHT JOIN 关键字会在右表 (SAL) 那里返回所有的行，即使在左表 (EMP) 中没有匹配的行，例如：
Select * from EMP Right join SAL on EMP.ENAME = SAL.ENAME; Inner Join关键字显示的是两个表相关的信息，例如：
SELECT * FROM EMP inner join SAL on EMP.ENAME = SAL.ENAME;Full Join关键字显示的是两个表全部的信息，例如：
SELECT * FROM EMP full join SAL on EMP.ENAME = SAL.ENAME; 1 0
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