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How to generate row number in SQL Without ROWNUM?

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How to generate row number in SQL Without ROWNUM?
posted Jan 19, 2014 by Vishvachi Tiwari

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1 Answer

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Best answer

Generating a row number – that is a running sequence of numbers for each row is not easy using plain SQL. In fact, the method I am going to show below is not very generic either. This method only works if there is at least one unique column in the table. This method will also work if there is no single unique column, but collection of columns that is unique. Anyway, here is the query:

SELECT name, sal, (SELECT COUNT(*) FROM EMPLOYEE i WHERE o.name >= i.name) row_num
FROM EMPLOYEE o
order by row_num

answer Jan 19, 2014 by Atul Mishra
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    1546    Ins_date   05062011
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    1546    X          10.4567
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I have data as above in table A. This table has many Assetids 1546,675,....etc. attributes might vary for assets.

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assetid  ins_date  status  X        Y       Size  depth  st_date
1546     05062011  active  10.4567  27.56   17    null   null
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I have created Stored procedure, then called in Informatica to achieve this output. However, since i have large volume of data, it is taking much time to load.

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