Table Constraint
Feb 25, 2005
In Oracle, you can set up table constraints which constrain data accross mutliple attributes/fields. Can you do this in Access?
For example. I have:
OrderLine(orderNum,orderLineNum,[productNum],date)
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:
CONSTRAINT chk_prod CHECK UNIQUE (orderNum, productNum)
Thanks for any help.
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Aug 17, 2005
Hi all. I want to check for not null value constraint for all tables in database . I tried the following but when i run it i get the following error:
Compile error:
Invalid Next control variable reference
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
Code: For Each T In db.TableDefs '''Skip the system tables If Left(T.Name, 4) <> "MSys" Then ''' this line determines the primary key of the table ''' by calling GetPk function from module pk = Left(GetPK(T, db), InStr(1, GetPK(T, db), "<-") - 1) cont = cont & ShowFields(T.Name) & vbCrLf & " primary key " & "(" & pk & ")" & vbCrLf & ")" & vbCrLf End If Next T ''' This line of code post the generated table statment to a massage box MsgBox cont
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Apr 6, 2008
Can anybody help me understand why I get the error
"Syntax error in CONSTRAINT clause"?
I get it in Access 2003 and Access 2007.
Both are clean installs with no add-ins
Running this code in VBA, or pasting the SQL directly in a query results in the same error.
Sub test()
sTableName = "Test"
sSQL = "CREATE TABLE " & sTableName & "_Config (" _
& "[idConfig] Int Primary Key," _
& "[Config] Memo," _
& "[Instrument] int," _
& "[Serial_No] Text(25)," _
& "[Firmware] int," _
& "[Orientation] int," _
& "[Sensors] int," _
& "[Sensor_Size] float," _
& "[Sensor_1_Distance] float)"
DoCmd.RunSQL sSQL
sSQL = "CREATE TABLE " & sTableName & "_Leader (" _
& "[idLeader] Int Primary Key," _
& "[idGroup] int," _
& "[idFile] int," _
& "[idConfig] int," _
& "[DateTime] DateTime," _
& "[Heading] float, [Pitch] float, [Roll] float," _
& "[Pressure] float, [Depth_BSL] float, [Height_ASB] float,"
_
& "[Min_Valid_Sensor] int, [Max_Valid_Sensor] int," _
& "[ASM_Bed_Level] float," _
& "CONSTRAINT [FK_Test_Leader_idConfig] FOREIGN KEY ([idConfig]) REFERENCES [Test_Config] ([idConfig]) ON DELETE CASCADE ON UPDATE CASCADE" _
& ")"
DoCmd.RunSQL sSQL
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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Sep 29, 2014
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).
Then, there is a criteria that a student can only take up to 6 courses. Hence, may I know that where and how can I include this constraint? I believe that it should be in the Macro (Before Change) of the table Register...
My relationship is: Student -> Register <- Section <- Course
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Sep 3, 2007
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 ...
Thanks
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Mar 13, 2005
I have a table with the following fields:
format
region
rarity
they are all set to lookup value lists:
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.
"Error 'Error evaluating CHECK constraint. ' in the validation rule."
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.
Can anyone help me work out why im getting this problem?
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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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Jun 26, 2005
Hi everybody .I created a bounded form that allows user to enter the following fields information
to the sql server db that is linked to access .The fields are: Projectno, taskcode, taskdiscription
and total hours worked.
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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Jun 29, 2005
Hi guys i got a form and sub form. When i leave the field hours empty in the sub form and try to click on close or some where in the form i get this error:
MsgBox "Primary key violation", , "Explanation"
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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Sep 22, 2014
Error: Error evaluating check constraint in the validation rule
What does this mean?
I have used a combo box in the table to input into 2 fields - one restricted to numbers 1 to 5 and the other restricted to letters A to E
Message comes up when I try to change the view or press submit. Does it have anything to do with the field type?
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Sep 29, 2013
How can I update (some columns) in a table from the same table based on a Criteria column in the same table.
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Jun 28, 2013
I need to get x and y coordinates for each device, but the data has to get looked up from 2 other tables.
I have a table (called InstReclosers) that has device names. Each device is on a Section. I can go to another table (called InstSections) and look up what Node that particular section is tied to. Then I need to go to another table (called Nodes) to get the X and Y location for that particular node.
How I can go about getting this X and Y data into the InstReclosers table?
...in summary, InstReclosers has device name and section name. InstSections has section name and node name. Nodes has node name and XY coords. Need XY coords for each device in InstReclosers.
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Jan 29, 2015
When I try to transfer (ctrl c + v) data from a table in Excel to a table in Access it loses format.
Exemple: $ 1.000,00 (Excel) become 1000 (Access).
I need to keep the format to make sure that the code works properly.
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Nov 4, 2014
I have a make-table query that pulls all the fields from 1 table (MainTable), and creates a new table with a date stamp based apon a form value entered (New Table = MainTableWithDate).
Currently, I setup the query to pull info from the form field like this:
DateField: [Forms]![frmmain]![DateField]
However, when the make-table query is done - all date fields are blank (all other fields are correctly created), and when I look at the new created table (mainTableWIthDate), the typeassigned to the date field is "Binary" (in the form, I've specified LongDate).
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Aug 5, 2014
I have a table products with a field "id_product" and "total" (Total items in stock)
I have a query with the fields "id_product" and also the field "total in stock"
I want an update query to update the field 'total' in table 'products' with infos from that query
For each id-product in table products, replace the field total with the field 'total in stock' from the query
So I want to update a filed in a specific table with infos form another table.
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Apr 19, 2013
Here's a query that the bottom listview in the attached form i.e. a listview representing a table of calls(many) to fims (1 top listview)
Code:
SELECT calls.id, calls.firm_id, calls.called, calls.said, calls.spoke_to, calls.next
FROM calls
WHERE (((calls.firm_id)=[firms].[id]))
ORDER BY calls.called DESC , calls.next DESC;
When I run the thing...I get a dialog asking me for firm id.
I want to change this so when I move up and down the firms LV (top)... the bottom LV updates taking firm id from the top LV with focus.
Access 2003.
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Jan 13, 2014
I have an MS Access accdb with linked SQL Server 2012 ODBC tables. I am working on a procedure to copy data from local tables to these linked tables (identical schema). I did a simple
Code:
DoCmd.RunSQL "INSERT INTO linkedTable SELECT * FROM localTable"
This works, but is very slow. Way too slow. (INSERT copies the data one record at a time).
I would like to copy the data in a bulk operation, or operations that I can execute programmatically.
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May 28, 2015
I have a table for a multiple parents linked to a child table. I need to figure out a way to only allow 1 parent to be coded as primary, 1 as secondary, and then the rest as other... I thought about making Primary/Secondary/Other a primary key. But then I can only have 1 other. I would have to make a finite number of parents that could be entered and I want an infinite number.... My end goal is to have a report that only has a primary and second parent on it, but the rest of the parents still exist in the table...
*Child_ID
Parent_First_Name
*Primary/Secondary/Other
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Sep 12, 2014
How to make a form open with data from a table based on a date and time in the/a table?
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Aug 29, 2006
Hi,
I am extracting data from linked db2 table using access make table query. First I create a select query and can view the linked db2 data, but when I change to a make table query I get an error message, "invalid argument", when I run the make table query. There is no selection critera specified. Has anyone had this happen? and Do you know a solution?
Thanks for your support
GinnyP
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Nov 24, 2006
Ok my problem is this......
I have a form with a field "Property Status" on it. It has 4 possible values -
"C - SHELTERED (with warden charge)";"H - SHELTERED (No warden charge)";"J - WHEELCHAIR SHELTERED (With warden charge)";"M - WHEELCHAIR SHELTERED (No warden charge)";"X - DISCONNECTED"
When the value "X - DISCONNECTED" is selected in the form I want the record to be removed from its existing table and sent to a new table which keeps all the "X - DISCONNECTED" records together.
Any ideas would be greatly appreciated. How would this be coded?
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Jan 21, 2005
Hi everybody,
Beginner here needs help !
I'm building a make-table query for which if the result is null (no record correspond to the set of criterias), a default message like "there was no activity during the period" would appear in the table (not a message box...I need the message in the output table). The best I could think of is an IIF function but it doesn't seem to work... Is there any way to do this without using VBA?
Thanks in advance !
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Nov 10, 2014
In a situation where I imported an excel file with so many columns and split them into two temp tables and they are linked using a key.
the data has a fixed part lets say
Field1....Field2.....Filed3.....Field4...then Field5.....Field6.....Field7....Field8 is the same data range as Field9...Field10...Field11...Field12. I would want to split this data into multiple rows like this
Field 1 Field2 Field3 Field4 Field5 Field6 Field7 Field8
Field 1 Field2 Field3 Field4 Field9 field10 field11 field12 and so own...
What is the best approach?
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Aug 17, 2012
I have one DB that is used for creating/storing customer ID's, and another DB that is used for creating/storing job information for customers.I have linked the table from the customer DB to the job DB.
There is a table in the job database that holds customer name and ID, and some VBA that generates unique job codes.
Is it possible to have the data from the linked table automatically update into the existing table?
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Feb 3, 2015
If you want to use a "DoCmd.RunSQL "INSERT INTO" command to insert data in a table and the data to insert comes from a table and a form, could this be done in one pass?
So...writing a record wit 4 values from table1 together with a additional value from a textbox in table2 as 5 values.
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Jan 22, 2015
Is there a way to append a pivot table to a table or possibly make a query based on a pivot table? I need to get a count of Part Numbers and I need the average price for all these parts. Additionally I want to ignore a count of less than 3.
Also I am having trouble filtering on the count in the pivot table... haha, so I was gonna Query on it later on.
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