Create a View or Partition Example in MySQL

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Hello All,

This is Regards of creating a View of Additional column with following requirement.
It would be great if I get some information on this

Example
I have a Table with the column as Specified and Sample value as below.

SQL

TABLENAME

RowNumber UtcTimeStamp           TotalRequest
1          2015-03-04 12:20:00    10441856
2          2015-03-04 12:30:00    10447205
3          2015-03-04 12:40:00    10454634
4          2015-03-04 12:50:00    10461790
5          2015-03-04 13:00:00    10469014
6          2015-03-04 13:10:00    10476494

I would need to create a View as following or PartitionLike below

Like always the First Row "ColumnResult" Column is 0

"ColumnResult" of Row 2 is
And from Row 2 Onwards, "ColumnResult"is =
TotalRequest(Value in Row 2 ) - TotalRequest(Value in Row 1 )

"ColumnResult" of Row 3 is
TotalRequest(Value in Row 3 ) - TotalRequest(Value in Row 2 )
and So on..

SQL

RowNumber UtcTimeStamp           TotalRequest    ColumnResult
1          2015-03-04 12:20:00    10441856       0
2          2015-03-04 12:30:00    10447205       5349
3          2015-03-04 12:40:00    10454634       7429
4          2015-03-04 12:50:00    10461790       7156
5          2015-03-04 13:00:00    10469014       ...
6          2015-03-04 13:10:00    10476494       so on...

Thanks and Regards
Durai Velan C.

Posted 6-Mar-15 1:04am

Duraivelan Chockalingam

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Herman<T>.Instance 9-Mar-15 6:58am

How does you query look right now?

1 solution

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Duraivelan Chockalingam · Accepted Answer · 2015-04-07T22:34:00

Hello Team,

I am closing this case, as I have got solution for it.

=======================================================

<pre lang="sql">

CREATE PROCEDURE GetDiffView()
BEGIN
SET @isFirstRow=1;
SET @ColumnThreeValuePrevious=0;

SELECT ColumnOne, ColumnTwo, ColumnThree
FROM ( 
SELECT ColumnOne, ColumnTwo.
@VColumnThree:=ColumnThree as CColumnThree,
(CASE
   WHEN @isFirstRow=1 THEN 0
   ELSE @VColumnThree-@ColumnThreeValuePrevious
END) as ColumnThree,
@ColumnThreeValuePrevious:=@VColumnThree,
@isFirstRow:=0
FROM DBTABLE ) Diff
END

Thanks and Regards
Durai Velan C