faustf

questions about mysql

4 posts in this topic

hi guy  ,  i  have a  table in mysql  ,  i would  recreate  a  index  .

Some time  i cancel some row  and  index  , is not  regular (ex. 123589), i want reorder in 123456 ,  exist  a command in mysql ??? 

i saw autoincrement  but  , not reorder the  number 

thankz at all

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This time I do not know, you should wait for others users to answer.
I'm not SQL expert ;)

Just only know a little about ADO and other technologies.

Cheers,
mLipok

 


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faustf,

Are you talking about record IDs? If so, what is the problem with non-adjacent IDs, after some delete operations for instance?

In 99% of SQL uses IDs are just like unique tags: it doesn't matter what they are, only that they are unique and permits to designate a precise row in a table.

You seem to want a rank() operator or function somewhere, but in what context is it actually useful?

Finally, realize that SQL tables are inherently orderless -- just like mathematical sets -- unless you retrieve data using a SELECT query with an ORDER BY clause. To be more explicit, there is no way to retrieve the 3rd row in a table unless you specify the ORDER BY clause which makes sense in this query.


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ok  understund    thankz  

 

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