how to write the sql?

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hi,

sql statement,

SQL

select * from STS_VEHICLE_RUNNING_STATUS
WHERE VRS_DEVICEID='ST0001' AND  VRS_UTCTIME BETWEEN '2012-07-02' AND '2012-11-09'

retrieve data from table as,

SQL

 VRS_DEVICEID          VRS_UTCTIME                    VRS_SPEED
-------------          -----------                    ---------
 ST0001                2012-07-02 10:59:26.000        0.36
 ST0001                2012-07-02 11:33:36.000        40
 ST0001                2012-09-06 18:45:29.000        0.26
 ST0001                2012-09-06 19:46:28.000        0.36
 ST0001                2012-10-09 12:10:12.000        50
 ST0001                2012-10-09 01:12:12.000        40

but i want to fill the gridview as below,

SQL

Date              start_time         stop_time       max_speed
----              ----------         ---------       ---------
2012-07-02        10:59:26.000       11:33:36.000      40

2012-09-06        18:45:29.000       19:46:28.000      0.36

2012-10-09        12:10:12.000       01:12:12.000      50

can i retrieve the whole date in single sql statement to fill the gridview as above? i want to do fill the gridview in a button click.

plz help me...

Thanks

Posted 16-Nov-12 1:15am

hasbina

Updated 16-Nov-12 1:23am

__TR__

v2

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Comments

damodara naidu betha 16-Nov-12 7:52am

Yes we can help you on this. But I have a doubt that what if a device is stated and stopped twice in a particular day? I mean two records in your table for a particular day.

hasbina 16-Nov-12 23:20pm

@damodara naidu betha
not clear..

1 solution

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__TR__ · Accepted Answer · 2012-11-16T01:53:00

Solution 1

Try the below query (Assuming you are using MSSQL Server)

SQL

SELECT CONVERT(VARCHAR(10), VRS_UTCTIME, 121) AS [Date],
MIN(SUBSTRING(CONVERT(VARCHAR(23), VRS_UTCTIME, 121), 12,20)) AS [start_time],
MAX(SUBSTRING(CONVERT(VARCHAR(23), VRS_UTCTIME, 121), 12,20)) AS [stop_time],
MAX(VRS_SPEED) AS [max_speed]
FROM STS_VEHICLE_RUNNING_STATUS
WHERE VRS_DEVICEID = 'ST0001' AND  VRS_UTCTIME BETWEEN '2012-07-02' AND '2012-11-09'
GROUP BY CONVERT(VARCHAR(10), VRS_UTCTIME, 121)

Posted 16-Nov-12 1:53am

__TR__

Updated 16-Nov-12 1:56am

v2

Comments

hasbina 16-Nov-12 23:16pm

Hi -TR_,

thanks sooooooo much _TR_...

hasbina 16-Nov-12 23:36pm

Hi _TR_
one problem.max speed getting is not correct...why?..

__TR__ 19-Nov-12 0:25am

Not sure what is the problem. I am getting the correct result when i execute the above query, for the data you have mentioned in your question.

hasbina 19-Nov-12 0:54am

@_TR_

sorry sir..its my mistake..now got correct answer..it was max speed datatype problem.
i cast it from varchar to decimal using

MAX( cast(VRS_SPEED as decimal(12,2))) AS [max_peed].

Thanks...

__TR__ 19-Nov-12 0:55am

No Problem. Glad you found out the issue.