Solved

Help : Difference between the 2 sql statements

Posted on 2009-07-06
8
238 Views
Last Modified: 2012-05-07
What is the Difference in this 2 sql statements.

SQL 1
============
select * from table_name a
where
      
      CONVERT(datetime, CONVERT(datetime, dateAdd(dd,datediff(dd,0,START_DATE_OF_TRAVEL),0))) >=       CONVERT(datetime, CONVERT(datetime, dateAdd(dd,datediff(dd,0,@START_DATE_OF_TRAVEL),0))) AND
      ( a.START_DATE_OF_TRAVEL >= @START_DATE_OF_TRAVEL and a.START_DATE_OF_TRAVEL <= @TRAVEL_END_DATE) AND
      datepart(dw, a.START_DATE_OF_TRAVEL) between 2 and 6

SQL 2
=========
select * from table_name  a where
      A.WORKFLOW_STATUS_ID=1 AND
      USER_ID <> @USER_ID AND
      CONVERT(datetime, CONVERT(datetime, dateAdd(dd,datediff(dd,0,START_DATE_OF_TRAVEL),0))) >=       CONVERT(datetime, CONVERT(datetime, dateAdd(dd,datediff(dd,0,@START_DATE_OF_TRAVEL),0))) AND
      ( a.START_DATE_OF_TRAVEL >= @START_DATE_OF_TRAVEL and a.START_DATE_OF_TRAVEL <= @TRAVEL_END_DATE)AND
      datepart(dw, a.START_DATE_OF_TRAVEL) in (1,7)

Please explain with eg. thanks
0
Comment
Question by:TECH_NET
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 4
8 Comments
 
LVL 12

Expert Comment

by:kevin_u
ID: 24787421
I assume you've detected this difference.

 A.WORKFLOW_STATUS_ID=1 AND
      USER_ID <> @USER_ID AND

In addition, the last item:
datepart(dw, a.START_DATE_OF_TRAVEL) between 2 and 6
matches dates of travel of monday thru friday

compared to
datepart(dw, a.START_DATE_OF_TRAVEL) in (1,7)
matches dates of travel of saturday and sunday

0
 

Author Comment

by:TECH_NET
ID: 24787462
Just wanted to make sure that the dates of travel for the 1sql was monday thru friday
and the latter was saturday/sunday.

The
 A.WORKFLOW_STATUS_ID=1 AND
      USER_ID <> @USER_ID AND
was my typo. I just omiited it out in the first one.

Anyway, was just curious since i was able to retrieve any results. Maybe my dates format was messed up.(CONVERT(datetime)
0
 

Author Comment

by:TECH_NET
ID: 24787532
the start_date_of_travel is stored in the following format
2009-07-06 15:11:03.000
2009-07-06 16:49:54.000
etc

I really want the date comparison on the date only.
With my sql, these dates get rounded to
2009-07-06 00:00:00.000
2009-07-06 00:00:00.000

and the sql query ( if replace the start-date with getdate() should return 2 records.
select CONVERT(datetime, CONVERT(datetime, dateAdd(dd,datediff(dd,0,getdate()),0))) from COMMUTER_REQUESTS_VIEW a where
 
      CONVERT(datetime, CONVERT(datetime, dateAdd(dd,datediff(dd,0,START_DATE_OF_TRAVEL),0))) >=       CONVERT(datetime, CONVERT(datetime, dateAdd(dd,datediff(dd,0,getdate()),0))) AND
      ( a.START_DATE_OF_TRAVEL >= getdate() and a.START_DATE_OF_TRAVEL <= getdate()) AND
      datepart(dw, a.START_DATE_OF_TRAVEL) between 2 and 6

and that is not happening.
0
Creating Instructional Tutorials  

For Any Use & On Any Platform

Contextual Guidance at the moment of need helps your employees/users adopt software o& achieve even the most complex tasks instantly. Boost knowledge retention, software adoption & employee engagement with easy solution.

 
LVL 12

Expert Comment

by:kevin_u
ID: 24787605
Are you asking another question?  I am unclear if you want me to do more.
0
 

Author Comment

by:TECH_NET
ID: 24787908
yes, the first queston arose from my question 2 which i assumed (if the explaination provided for the question 1 was the correct one - which i do agree), should have provide me with 2 records from my database.

0
 
LVL 12

Expert Comment

by:kevin_u
ID: 24787964
if this is still part of your query, it won't work.
( a.START_DATE_OF_TRAVEL >= getdate() and a.START_DATE_OF_TRAVEL <= getdate()) AND

this will only work if start_date_of_travel is the current date and time exactly.
0
 

Author Comment

by:TECH_NET
ID: 24788258
how can i get compare with the date part of the date
0
 
LVL 12

Accepted Solution

by:
kevin_u earned 500 total points
ID: 24788385
You've already answered that yourself:

CONVERT(datetime, CONVERT(datetime, dateAdd(dd,datediff(dd,0,START_DATE_OF_TRAVEL),0)))

>=  CONVERT(datetime, CONVERT(datetime, dateAdd(dd,datediff(dd,0,getdate()),0)))

That part will work just fine.

I'm not clear on what you're trying to accomplish.  Maybe some sample data would help.
0

Featured Post

Enroll in May's Course of the Month

May’s Course of the Month is now available! Experts Exchange’s Premium Members and Team Accounts have access to a complimentary course each month as part of their membership—an extra way to increase training and boost professional development.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

So every once in a while at work I am asked to export data from one table and insert it into another on a different server.  I hate doing this.  There's so many different tables and data types.  Some column data needs quoted and some doesn't.  What …
Introduction: When running hybrid database environments, you often need to query some data from a remote db of any type, while being connected to your MS SQL Server database. Problems start when you try to combine that with some "user input" pass…

751 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question