Question

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How do I limit the number of rows returned by an oracle query?

I have this query

select * from pr_device_reading order by date_reading DESC

Note that this query is normalized, constructed by a method, and the table name will change according to the method’s argument, so I can’t specify the column names (and I do want all the columns in the result anyway).

What is the equivalent of

SELECT * 
 FROM pr_lecture_combustibles 
ORDER BY date_lecture DESC 
LIMIT 10,20;

using Oracle SQL?

I have tried

SELECT * 
  FROM (SELECT * 
          FROM pr_lecture_combustibles 
         ORDER BY date_lecture DESC) 
 WHERE ROWNUM BETWEEN 10 AND 20;

and other syntax, but I get no result, “missing expression” messages and other errors.

Thanks

Answer 1

If you can accept getting an additional column for the row number, you can apply the ROW_NUMBER analytic function and do something like this

SELECT *
  FROM (SELECT a.*,
               ROW_NUMBER() OVER( order by date_lecture desc ) rn
          FROM pr_lecture_combustibles a)
 WHERE rn BETWEEN 10 AND 20

But you’ll get all the columns in the table plus the RN column