select * from tb order by 1
select * from tb order by 2
select * from tb order by 3
select * from tb order by 4这种order by 写法是什么意思啊?还有 如果 select * from tb order by 0
这样的写法又是错误的 这又是为什么啊
select * from tb order by 2
select * from tb order by 3
select * from tb order by 4这种order by 写法是什么意思啊?还有 如果 select * from tb order by 0
这样的写法又是错误的 这又是为什么啊
order by 2 按第2列排序
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