Rownum in postgresql

Question

Is there any way to simulate rownum in postgresql

User · Answer

Postgresql does not have an equivalent of Oracle s ROWNUM  In many cases you can achieve the same result by using LIMIT and OFFSET in your query

User · Answer

Postgresql have limit   Oracle s code   select   from   tbl where rownum  lt   1000    same in Postgresql s code    select   from   tbl limit 1000

User · Answer

If you have a unique key  you may use COUNT    OVER   ORDER BY unique key   as ROWNUM  SELECT t    count    OVER  ORDER BY k   ROWNUM  FROM yourtable t     k       n   rownum    --- ------- --------    a   TEST1        1     b   TEST2        2     c   TEST2        3     d   TEST4        4     DEMO

User · Answer

use the limit clausule  with the offset to choose the row number -1 so if u wanna get the number 8 row so use   limit 1 offset 7

User · Answer

If you just want a number to come back try this   create temp sequence temp seq  SELECT inline v1 ROWNUM inline v1 c1 FROM   select nextval  temp seq   as ROWNUM  c1  from sometable  inline v1    You can add a order by to the inline v1 SQL so your ROWNUM has some sequential meaning to your data   select nextval  temp seq   as ROWNUM  c1  from sometable ORDER BY c1 desc    Might not be the fastest  but it s an option if you really do need them

User · Answer

I have just tested in Postgres 9 1 a solution which is close to Oracle ROWNUM   select row number   over   as id  t   from information schema tables t

User · Answer

Postgresql   8 4   SELECT      row number   OVER  ORDER BY col1  AS i       e col1       e col2            FROM

[postgresql] Rownum in postgresql

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