sql query execution

Question

0.00/5 (No votes)

See more:

SQL-Server-2005

i have to compare time attributes of two tables and query is like

select s.sid
from sal s, prod p
where s.date='2008-01-10'
and p.beginDate< s.date
and p.endDate>s.date

i want to know, how it will be evaluated.mean, is it same to following query

select s.sid
from sal s, prod p
where s.date='2008-01-10'
and p.beginDate<2008-01-10'
and p.endDate>'2008-01-10'

Posted 17-Dec-10 8:01am

s_aslam98

Add a Solution

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sandeep Mewara · Answer 1 · 2010-12-17T08:08:00

Solution 1

Use Query analyzer of SQL Server to find the query cost and performance.

Posted 17-Dec-10 8:08am

Sandeep Mewara

Comments

s_aslam98 17-Dec-10 14:10pm

okay, i check it.but, is it theoratically right

#realJSOP · Answer 2 · 2010-12-17T08:09:00

Solution 2

Yes, it should do the same thing, but you could have determined that yourself by simply running the two different query versions in SQL Server Management Studio Express...

Posted 17-Dec-10 8:09am

#realJSOP

Updated 17-Dec-10 8:10am

v2

Rene Bustos · Answer 3 · 2011-11-09T10:37:00

Hi,
there's two way to compare Date Time types, but i see that you need the Date and not the time comparation right?

well, if you need the time Use this function CONVERT(DataType,Value,#)
here an example

SELECT CONVERT(varchar(11),fecha_de_Emision,113),
       CONVERT(varchar(11),fecha_de_Emision,112) ,
       CONVERT(varchar(11),fecha_de_Emision,110) ,
       CONVERT(varchar(11),fecha_de_Emision,109)
FROM TableOfSomeDates WHERE Date1 >=Date2

the result is a several dates in differents formats..

remember if you want comparate Date be sure that the date is in the correct format like MM/DD/YY OR MM/DD/YYYY OR MM/DD/YYYY HH:MM:SS

the simple way to do this is to use the CONVERT function

CONVERT(varchar(11),fecha_de_Emision,110) the result is '11-09-2011' (avoid the time, leave only the Date)
then you can compare with your DateTime
Regards!!!

[Edited]Code is wrapped in "pre" tag[/Edited]