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how to change the query from oracle to  mysql.

Posted on 2016-10-05
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Last Modified: 2016-10-06
below query has been written in oracle.how to change this query in mysql.

select *
               from (
                    select rownum as rn, a.*
                    from (select * from test
                            where test_datetime  <= #{testDate}
                          order by test_datetime asc) a
                          )
              where rownum <= #{pageSize} and rn > #{offset}
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Question by:chaitu chaitu
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3 Comments
 
LVL 36

Expert Comment

by:ste5an
ID: 41829830
It's exactly the same in MySQL.

The interesting part is: In what front-end do you use? Cause the parameter format looks pretty suspicious.
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LVL 20

Author Comment

by:chaitu chaitu
ID: 41829842
java.
Is rownum  there in mysql?
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LVL 36

Accepted Solution

by:
ste5an earned 2000 total points
ID: 41829858
Ah, I see. In this case you need an iterator:

SELECT T.*, 
       @rownum := @rownum + 1 AS rownum
  FROM yourTable T, 
       (SELECT @rownum := 0) R

Open in new window


E.g. untested
SELECT  * ,
		@rownum := @rownum + 1 AS rownumO
FROM    ( SELECT	@rownum := @rownum + 1 AS rownumI ,
                    A.*
          FROM      ( SELECT    *
                      FROM      test
                      WHERE     test_datetime <= '#{testDate}'
                      ORDER BY  test_datetime ASC
                    ) A,
					 (SELECT @rownum := 0) RI
        ) B ,
		(SELECT @rownum := 0) RO
WHERE   rownumI <= '#{pageSize}'
        AND rownumO > '#{offset} '

Open in new window

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