how to write sql query

Question

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SQL

DECLARE @PDate date,
@In_Punch datetime
SELECT *From MASTERPROCESSDAILYDATA where PDate>='02-1-13' AND PDate<= '02-28-13'
IF(@In_Punch>='08:00:00' AND @In_Punch <= '09:30:00')
BEGIN
    UPDATE MASTERPROCESSDAILYDATA set Status = 'P'  SELECT  *from MASTERPROCESSDAILYDATA;
END

ELSE

SQL

BEGIN
    UPDATE MASTERPROCESSDAILYDATA set Status = 'HL'  SELECT  *from MASTERPROCESSDAILYDATA;
END</pre>

It is not working only else part is executing & status is updated to all the students.

Can anyone help me how to write sql query where In_punch between '08:00:00 AM' AND '10:30:00AM'

Out_punch between '04:00:00 PM' AND '05:30:00PM'

Consider for a set of 5 students like std1,std2,std3,std4,std5(from table1)

eg:
std1,std2 made their punches beyond the timings i.e., In_punch between '08:00:00 AM' AND '10:30:00AM',
Out_punch between '04:00:00 PM' AND '05:30:00PM'
UPDATE Status ='P'
otherwise
UPDATE Status ='HL'

How can i update the status of students using if condition or loops

Thanks in advance

Posted 23-Dec-13 23:05pm

Karthik Achari

Updated 24-Dec-13 0:32am

v4

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Comments

OriginalGriff 24-Dec-13 5:12am

How are you storing the data? What are the datatypes?

Karthik Achari 24-Dec-13 7:40am

datatype for In_Punch & Out_Punch was datetime
datatype for status was varchar(MAX)

Ashish_Agrawal 24-Dec-13 7:05am

Where are you assigning @In_Punch?

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OriginalGriff · Answer 1 · 2013-12-24T02:10:00

The problem is probably that you need to look at the time parts only: a DateTime has both date and time, so if your timestamps are literally that then they probably include a date element. But that code looks rather odd anyway...
What you probably want to do is along the lines of

C#

UPDATE MASTERPROCESSDAILYDATA SET Status =  
   CASE WHEN CAST(PDate AS TIME) 
             BETWEEN CAST ('08:00' AS TIME) 
             AND CAST('09:30' AS TIME)
   THEN 'P'
   ELSE 'HL'
   END

[edit]Wrong column name[/edit]