Read one field in every row during SELECT

Transact-SQL

PPCUBAN


Hello

I have a table that keeps track of every access to the system. We insert the UserID, TimeOfAccess and TypeOfAccess.


We want to create a report and due to the limitations of Reporting Services for programatically processing, we want to create a temporary table to have the columns already set up for the report with the info that we need.

ORIGINAL TABLE

USERID | TIMEOFACCESS | TYPE OF ACCESS

---------------------------------------------------------------------

2323 | 12/15/2007 03:52:54 | CLOCKIN

2323 | 12/15/2007 04:32:54 | CLOCKOUT

2323 | 12/15/2007 05:42:54 | CLOCKIN

2323 | 12/15/2007 07:53:54 | CLOCKOUT

2323 | 12/15/2007 09:18:54 | CLOCKIN

2323 | 12/15/2007 10:24:54 | CLOCKOUT

TEMPORARY TABLE

USERID | CLOCKIN | CLOCKOUT | ELAPSEDTIME

------------------------------------------------------------------------

2323 | 03:52:54 | 04:32:54 | 0:40:54

OK. the problem is that I need to read the fields one by one in the SELECT statement so i can insert (and Update) the fields of the temporary table.

I create my temporary table

CREATE #TempTable

(

UserID int,

ClockIN DateTime null,

ClockOUT DateTime null,

ElapsedTime DateTime null,

)

I want to be able to do this in my stored procedure. I can doit in a form but i want to return from my database the datatable already suitable for my report.

Does anyone know how to read in a SELECT statement one field as it's been read



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Re: Read one field in every row during SELECT

dready


you can do that using a cursor in your stored procedure.

See: http://www.sqlteam.com/item.asp ItemID=553

If you dont want to use a cursor, its possible as well:

http://www.sql-server-performance.com/dp_no_cursors.asp



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Re: Read one field in every row during SELECT

joeydj

hi,

you can achieve this using a better solution by dong a self join on userid and midnight(dateaccess)

you just have to drop the timepart of the date on the join. you dont even need the temp table.

here's the pseudocode: you just need to imporve this.

select userid, convert( varchar(20),dateaccess,102) as dateaccess, convert( varchar (20),dateaccess,108) as clockin, t2.clockout from table1 t1

where [type of access]='clockin'

join

(select userid, convert( varchar(20),dateaccess,102) as dateaccess,

convert( varchar(20),dateaccess,108) as clockout, from table1

where [type of access]='clockout')

as t2

on t1.userid=t2.userid and t1.dateaccess=t2.dateaccess

regards,

joey






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Re: Read one field in every row during SELECT

hunchback

Try selecting the minimum "clockin" and maximum "clockout" per each userid, then calculate the diff in seconds.

Code Snippet

;with cte

as

(

select

userid,

min(case when [type of access] = 'clockin' then [time of access] end) as clockin,

max(case when [type of access] = 'clockout' then [time of access] end) as clockout,

datediff(

seconds,

min(case when [type of access] = 'clockin' then [time of access] end) as clockin,

max(case when [type of access] = 'clockout' then [time of access] end) as clockout

) as elapsed_time_sec

from

dbo.t1

group by

userid

)

select

userid,

clockin,

clockout,

right('00' + ltrim(elapsed_time_sec / 3600), 2) + ':' +

right('00' + ltrim((elapsed_time_sec % 3600) / 60), 2) + ':' +

right('00' + ltrim((elapsed_time_sec % 3600) % 60), 2)

from

cte;

AMB


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Re: Read one field in every row during SELECT

PPCUBAN

None of this solutions actually work.

I don't get the desired result. I think this is something impossible to do in a Stored Procedure wich is very disappointing because is not so difficult to do in a form. But that's what i don't want. There has to be a way... i guess i need to study more the t-sql language. I just can't believe t-sql is so poor.


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Re: Read one field in every row during SELECT

hunchback

Try:

Code Snippet

;with cte_1

as

(

select

userid,

[TIME OF ACCESS],

[TYPE OF ACCESS],

row_number() over(partition by userid order by [TIME OF ACCESS]) as rn

from

dbo.t1

),

cte_2

as

(

select

a.userid,

a.[TIME OF ACCESS] as CLOCKIN,

b.[TIME OF ACCESS] as CLOCKOUT,

datediff(second, a.[TIME OF ACCESS], b.[TIME OF ACCESS]) as elapsed_time_sec

from

cte_1 as a

inner join

cte_1 as b

on a.userid = b.userid

and a.rn = b.rn - 1

and a.[TYPE OF ACCESS] = 'CLOCKIN'

and b.[TYPE OF ACCESS] = 'CLOCKOUT'

)

select

userid,

CLOCKIN,

CLOCKOUT,

right('00' + ltrim(elapsed_time_sec / 3600), 2) + ':' +

right('00' + ltrim((elapsed_time_sec % 3600) / 60), 2) + ':' +

right('00' + ltrim((elapsed_time_sec % 3600) % 60), 2)

from

cte_2

order by

userid,

CLOCKIN;

go

BTW, I wonder why elapsed time for the first two rows is "00:40:54", is they both have same number of seconds. I think it should be "00:40:00".

AMB


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Re: Read one field in every row during SELECT

PPCUBAN

This is it.

It works perfectly fine.

Definitely i am gonna buy a couple of T-SQL books. Any suggestion on the best title or publisher

Jose


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Re: Read one field in every row during SELECT

hunchback

I will suggest the serie "Inside SQL Server 2005".

Inside Microsoft SQL Server 2005: T-SQL Querying

http://www.amazon.com/Inside-Microsoft-SQL-Server-2005/dp/0735623139/ref=pd_bbs_sr_3/002-2026708-7606405 ie=UTF8&s=books&qid=1179781170&sr=1-3

Inside Microsoft SQL Server 2005: T-SQL Programming

http://www.amazon.com/Inside-Microsoft-Server-2005-Pro-Developer/dp/0735621977/ref=pd_sim_b_1/002-2026708-7606405 ie=UTF8&qid=1179781170&sr=1-3

Inside Microsoft (r) SQL Server (tm) 2005: The Storage Engine

http://www.amazon.com/Inside-Microsoft-SQL-Server-2005/dp/0735621055/ref=pd_sim_b_2/002-2026708-7606405 ie=UTF8&qid=1179781170&sr=1-3

AMB

P.S. Your alias exposed you.

PP --> Pepe (Jose)

CUBAN --> from Cuba

Oye chico, vinistes a bailar en casa del trompo.


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Re: Read one field in every row during SELECT

Arnie Rowland

AMB

P.S. Your alias exposed you.

As one who belives in transparency, and thinks that a lot of folks are stuck in grade school with their childish and 'cutsy' nom de plumes, exactly how this is a problem in this venue

Granted, anonymity has it purposes and places -but really, are these forums such place to fear exposure





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Re: Read one field in every row during SELECT

PPCUBAN

good point. I am not affraid of exposure. As a matter of fact, most of the people online knows me by that name. ppcuban@{most famous emails}.com are my address, the domain ppcuban.com also... hahaha. So, basically everybody call me ppcuban as a nickname even out of internet.

AMB Tu eres cubano




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Re: Read one field in every row during SELECT

hunchback

Jose,

Nacido y criado en la Vibora. Emigre hacia los Estados Unidos de america hace 9 anios. Vivi por un tiempo en Miami y ahora radico en Carolina del Sur (No pastelitos de guayava y mucho menos masareal).

Saludos,

Alejandro Mesa


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