Solved

insert into Table (select All Mondays between StartDate  and EndDate, numbered)

Posted on 2009-04-06
6
505 Views
Last Modified: 2012-05-06
hi, i need to make events for each Monday (or any day) between StartDate and EndDate, i am clueless


the user will enter startdate and enddate, and i will number each one of them, (not according to week, there will be no events in school holidays, so week10 of the normal calender could be Monday8, if 2 weeks are skipped)

INSERT INTO EVENT(Title,Date,EventNr)
e.g.
Monday 1, 200x/01/01, 1
Monday 2, 200x/01/08, 2
Monday 3, 200x/01/15, 3

please help.
i have looked at this project
http://www.codeproject.com/KB/database/sqlscheduleselector.aspx
but it does not enter any events into databases.

0
Comment
Question by:jxharding
[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
  • 2
6 Comments
 
LVL 60

Accepted Solution

by:
chapmandew earned 500 total points
ID: 24079508
declare @date1 datetime, @date2 datetime

select @date1 = '1/1/2009', @date2 = '4/6/2009'

set datefirst 1
;with dates(firstdate, lastdate, mondaycount)
as
(
select @date1, @date1, case when datepart(dw, @date1) = 1 then 1 else 0 end
union all
select firstdate, dateadd(d, 1, lastdate), case when datepart(dw,dateadd(d, 1, lastdate) ) = 1 then 1 else 0 end
from dates d
where lastdate <= @date2
)
insert into events(title, date, eventnmbr)
select 'Monday', lastdate, row_number() over(order by lastdate asc) from dates
where mondaycount > 0
0
 

Author Comment

by:jxharding
ID: 24085296
awesome stuff!! i am trying to make head or tails here still.
i am obviously awarding the points, and i see you are nr3 on the hall of fame, so you are busy, but if possible , could you pls save a few seconds on some short questions

1.
set datefirst 1
-is this a declaration and instatiation all in one?
-is it/is it not the same as declare datefirst; set datefirst =1

2.
;with dates
-im trying to google "SQL SERVER WITH" but not getting good results.
am i correct in observing that this is a table declaration and the items in brackets are the column names?
- is this some sort of new way to not work with #tables? (temp tables)

3.
which line of code actually generates the list of dates?

thanks!
0
 
LVL 60

Expert Comment

by:chapmandew
ID: 24086286
Hi, no problem...glad it worked for you.  
1.  The set date first made sure that we are both using the same date for the first day of the week. That way when I do this:  datepart(dw,dateadd(d, 1, lastdate) ) = 1, it evaluates to Monday.

2.  This is a common table expression.  Here is an article I wrote about them.  
http://blogs.techrepublic.com.com/datacenter/?p=275

3.  They're all a part of it.  If you look at this:
--this generates the very first line
select @date1, @date1, case when datepart(dw, @date1) = 1 then 1 else 0 end
--this generates all lines after it.
union all
select firstdate, dateadd(d, 1, lastdate), case when datepart(dw,dateadd(d, 1, lastdate) ) = 1 then 1 else 0 end
from dates d
where lastdate <= @date2
--this very last line limits the number so that it only loops up to the date you want.  

Try reading the article I wrote...it might make more sense afterwards.

HTH,
Tim
0
Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

 

Author Comment

by:jxharding
ID: 24086333
sometimes great posts like these come along and pinpoint exactly what one needs to learn, thanks a lot!!!
0
 
LVL 60

Expert Comment

by:chapmandew
ID: 24086344
You are very welcome!  Glad to help.
Tim
0
 
LVL 60

Expert Comment

by:chapmandew
ID: 24086350
BTW..you can check out my new website at www.sqlservernation.com.
0

Featured Post

Ransomware: The New Cyber Threat & How to Stop It

This infographic explains ransomware, type of malware that blocks access to your files or your systems and holds them hostage until a ransom is paid. It also examines the different types of ransomware and explains what you can do to thwart this sinister online threat.  

Question has a verified solution.

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

In this article I will describe the Backup & Restore method as one possible migration process and I will add the extra tasks needed for an upgrade when and where is applied so it will cover all.
This article explains how to reset the password of the sa account on a Microsoft SQL Server.  The steps in this article work in SQL 2005, 2008, 2008 R2, 2012, 2014 and 2016.
Michael from AdRem Software outlines event notifications and Automatic Corrective Actions in network monitoring. Automatic Corrective Actions are scripts, which can automatically run upon discovery of a certain undesirable condition in your network.…
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …

729 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