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  1. DZone
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  3. Databases
  4. Database pagination on mySql and Oracle

Database pagination on mySql and Oracle

Michael Mainguy user avatar by
Michael Mainguy
·
Feb. 15, 13 · Interview
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Having studiously avoided Oracle for over 20 years, I'm now working in a shop that uses it almost exclusively. Aside from the general overall expense of the product I'm routinely amazed at how many features other DBMS's I've used (DB2, MSSQL, MySQL, PostGres) are either missing or syntactically difficult to understand.

The most recent example is server side pagination… or more specifically, having the DBMS limit the results returned to for specific subsets of rows. In oracle to do this, one must run a query something like this:

select * from (select name, rownum rn from 
        (select name
          from users order by name)
      where rownum <= 10) where rn > 5;

I realize that this is a legacy syntax, but I personally find the new way just as obtuse. The new way (I guess) is supposed to be:

select * from (select name,
        row_number() over
        (order by name) rn
  FROM users) where rn between 5 and 10 order by rn

Compare this with the syntax for mySql (also now I guess technically part of the Oracle corporation):

select * from users order by name limit 5,5;

I find mySql's syntax to be more concise and don't really understand why Oracle's syntax is so convoluted other than perhaps some dogmatic insistence on following some sort of standard or an internal engineering group who was all hopped up on set theory drugs of some sort ;)



MySQL Database

Published at DZone with permission of Michael Mainguy, DZone MVB. See the original article here.

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