How will fetch last 5 rows from table in db2
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Answer / sree
SELECT * FROM TABLENAME ORDER BY PRIMARYCOLUMNNAME DESC
FETCH FIRST 5 ROWS ONLY ;
THIS ANSWER IS VALID ONLY IF THERE IS A PRIMARY KEY
COLUMN,OTHERWISE IT WONT WORK
IF THERE IS NO PRIMARY KEY COLUMN IN GIVEN TABLE ,I DON'T
KNOW THE ANSWER
FOR FETCHING FIRST 5 ROWS
SELECT * FROM TABLENAME FETCH FIRST 5 ROWS ONLY;
| Is This Answer Correct ? | 8 Yes | 1 No |
Hi Harsha,
There is nothing to do with multiple of 5.
Simply declare the array of occours of 5 keep on filling
it when 6th record comes start over writing it from 1st.
At last we only left with the last 5 fetched rows.
Vaneesh Khurana
| Is This Answer Correct ? | 1 Yes | 0 No |
See there is no direct method to do so, but still if we want
last 5 rows only we can create a logic which is as follows.
1. Declare an array to save the fetch rows with occurs of 5.
2. Now fetch the rows and start saving in that array such
that when the count becomes 5 overwrite the 6th fetch in the
first occurs similarly the 7th fetch on the 2nd occur.
3. Now when all the fetching is done the array will contains
the last 5 fetched rows.
| Is This Answer Correct ? | 2 Yes | 2 No |
Answer / harsha
Vaneeshh, your logic will not work if number of records are
not in a multiple of 5.
| Is This Answer Correct ? | 1 Yes | 1 No |
Answer / mahyn
select * from tablename
order by primary_key desc
fetch first 5 rows only
with ur;
can be one way...
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / mayur bhayani
SELECT * FROM (SELECT * FROM T ORDER BY pk DESC FETCH FIRST 5 ROWS) AS X
ORDER BY PK;
| Is This Answer Correct ? | 3 Yes | 11 No |
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