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mysql查询中的小数点是什么意义

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Release： 2016-06-13 12:10:02
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mysql查询中的小数点是什么意思，
我看有的是这样写的select g.name SUM(og.names_number) as names_number ;这个g.是什么意思，怎么还有个小数点啊，表中并没有g啊
------解决思路----------------------
select g.id,g.name from table as g

g代表表的别名，如果表名很长可以通过别名来替代，
------解决思路----------------------
库名.表名.字段名
完整写是这样的
------解决思路----------------------
as 可以缺省

select g.* from tbl_name as g
select g.* from tbl_name g

都是可以的

Related labels：
from name nbsp select
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