Access Constraint: Overlapping Dates

Sep 9, 2005

Hi,

I have developed a small hotel booking system which inserts records into a reservations table. The table looks like this:
[ReservationNr][StartDate][EndDate][RoomNr]

I am now trying to add a constraint which prevents a room from beeing booked twice on the same day, hence the time period defined by StartDate and EndDate in a record must not overlap with another record.
Is Access capable of adding such a constraint?
It was easy to add a constraint that prevents a booking where the StartDate is before the EndDate, but this one needs to reference already existing records.
Any help would be much appreciated.

Thanks

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General :: How To Implement Query Into Table To Prevent Overlapping Dates

Jun 30, 2014

I'm creating an equipment hire database, and I was wondering how I would not permit overlaps of equipment hire ie. equipment being borrowed before it is returned. I have a query that lists all bookings that overlap, but I am unsure of how to implement this into the table to prevent overlaps.

The SQL for the query is as follows:

SELECT Bookings.[Booking ID], Bookings.[Instrument ID], Bookings.[Borrow Date], Bookings.[Return Date], Bookings_1.[Booking ID], Bookings_1.[Instrument ID], Bookings_1.[Borrow Date], Bookings_1.[Return Date], ([Bookings_1].[Borrow Date]>[Bookings].[Return Date]) Or ([Bookings_1].[Return Date]<[Bookings].[Borrow Date]) Or ([Bookings].[Instrument ID]<>[Bookings_1].[Instrument ID]) Or ([Bookings].[Booking ID]=[Bookings_1].[Booking ID])

[Code]...

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Jun 26, 2005

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I want for example when a user tries to enter total hours work for a user (Hours in hours worked table) and
if he did not already enter wages of the employee for that particular project (amount in hourly wages table)
that user get a massage prompt and ask user to enter amount in to hourly wages table first. Possibly opening that form.

I be happy if some one help me add this feature to my form. Thanks


http://i5.photobucket.com/albums/y180/method007/constraint.jpg (table reletionships pic)

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I am developing a simple database for students to register courses using Microsoft Access 2010. I have 4 tables: Student, Register, Course, and Section (1 Course can have many Sections).

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My relationship is: Student -> Register <- Section <- Course

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In Oracle, you can set up table constraints which constrain data accross mutliple attributes/fields. Can you do this in Access?

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I dont want to allow for the same product to be put on one order twice. Therefore, (orderNum,productNum) must be unique, but productNum is not a part of the primary key so it can be repeated in every row for all the database cares. :P

How can I set this up.

In Oracle I would do something like:

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Thanks for any help.

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I have an Access 2002 database with a relationship between 2 tables I want to delete using VB code. I setup the relationship from within Access. Is there a way to find out the name of the relationship, if there is such a thing. The tables are: TableA.Id linking to TableB.BankAcctId with both cascade functions. What would the VB code look like? Something like ALTER TableB DROP CONSTRAINT ...
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I have a table of records, which has within it two date fields (effectively, a 'start' and 'end' date for that particular record)

I now need to create a query to perform a calculation for each date between the 'start' date and the 'end' date

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Is there a way to do this?

So basically, if for a particular record, the 'start' date is 01-Apr-2015 and the 'end' date is 09-Apr-2015, can I produce a dataset of 9 records as follows :01-Apr-2015

02-Apr-2015
03-Apr-2015
04-Apr-2015
05-Apr-2015
06-Apr-2015
07-Apr-2015
08-Apr-2015
09-Apr-2015

(The *obvious* solution would be to create a separate table of dates, from which I could just SELECT DISTINCT <Date> Between #04/01/2015# And #04/09/2015# - but that seems like a dreadful waste of space, if that table is only required to generate the above? And it would have to cover all possible options; so it would either have to be massive, and contain every possible date - ever! - or maintained, adding new dates as necessary when they are required. Seems horribly inefficient!)

Is it possible to just select each date between the two reference dates? Or can you only query something which exists somewhere in a table?

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Mar 13, 2005

I have a table with the following fields:

format
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rarity

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format: tape; dvd
region: 0;1;2;3;4;5;6;7;8;pal;ntsc
rarity: 1;2;3;4;5

I have a check that makes sure (format, rarity, region) is unique.

It works fine until i set region to either "pal" or "ntsc", then I get the following error.

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I set up the constraint by going to table design view -> indexes -> created new index with each of the three fields listed one after another -> set to primary=no, unique=yes, ignore nulls=no.

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May 10, 2007

Here's a good one for the experts...

I have a query that sums downtime on equipment. The problem that I came across is that there can be multiple status items open up on the same piece of equipment. When the restored time on one status item occurs after the down time of another, the query still adds the total down time of both status items which is giving me greater downtime than there actually is.

Is there a workaround for this?

Thanx,
MJ

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Jun 29, 2005

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instead of

MsgBox "Violation of Not Null constraint", , "Explanation"

i want to trap not null error and prompt the user that he has to enter value for hours field but aparently it does not. i be happy if some one help me fix this error .Thanks

picture of form in action:

http://i5.photobucket.com/albums/y1...tnullerror1.jpg
http://i5.photobucket.com/albums/y1...tnullerror2.jpg

code for on error :

Code:Private Sub Form_Error(DataErr As Integer, Response As Integer)Select Case DataErr Case 3162 MsgBox "Violation of Not Null constraint", , "Explanation" Case 3146 MsgBox "Primary key violation", , "Explanation" Case 3155 MsgBox "Trigger violation: 'Wages of the employee in this project is not existed. You must enter data of hourly wage first'", , "Explanation" Case Else MsgBox "Other errors" End SelectEnd Sub

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Hi

I need to know how to avoid from overlapping between times per date when the user is isernt a new data.


I thought to use dllookup function but it finds one result but if there is more than one result.

Date Ent Ext

1/1/2007 8:00 17:00
1/1/2007 9:00 16:00
1/1/2007 10:00 15:00

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I be happy if some one one help me fix this error.if i remove the bold lines the program workes well but it does not put not null for table fileds that requries value.

picture of the output without the bold part

http://i5.photobucket.com/albums/y1...007/notnull.jpg


Code:Option Compare Database''This module displays field name and type in a massage boxFunction ShowFields(pTable As String) As StringDim db As DatabaseDim rs As RecordsetDim I As Integer''Dim j As IntegerDim n As Integer''Dim NL As StringDim strHold As String, ST As String''Dim x As Variant''NL = Chr(13) & Chr(10) ' Define newline.Set db = CurrentDbSet rs = db.OpenRecordset(pTable)n = rs.Fields.CountReDim x(n - 1, 1) As String'''ST = "Create Table " & pTable & vbCrLf''adding Create table and table name to statementST = "Create Table " & pTable & vbCrLf & "("For I = 0 To (n - 1)For Each fld In tbl.Fields ST = ST & rs.Fields(I).Name & " " & FieldType(rs.Fields(I).Type) & "," & vbCrLf If fld.Required = True Then ST = ST & " NOT NULL" & " " Else ST = ST End IfNext Irs.Closedb.CloseSet db = NothingShowFields = ST '' returns the fields name to main functionEnd Function

on click even code

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Running this code in VBA, or pasting the SQL directly in a query results in the same error.


Sub test()
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sSQL = "CREATE TABLE " & sTableName & "_Config (" _
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_
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End Sub


The first table is created just fine.
And if I leave the constraint clause out, the second table is created also.
If I try to run it as an SQL query right in Access, after the error is delivered, it highlights the word DELETE, and if I reverse the update and delete portions, it highlights the word UPDATE.

I have looked up the clause in Access help and even using their example, i get the same error.


Any help will surely be appreciated!

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