Field rules/validation rules

I have a table which consists of field names like ID, Unit, DATE, Time, Site

Time means either AM, PM, LUNCH.

Each date (eg. 2nd March, 2012) could have 3 different TIME.
Each date and time is stored in different rows/as separate record

How do I set the rules to my query or my table that 2nd march of TIME - PM cannot be a repeat and so on? I know how to set rules for each field in the table itself but my problem is 2nd March could be repeated 3 times in that column and Time could be repeated too and if 2nd March, 2012 of TIME - PM already exits, Access should warn the user.

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Related Topics

Validation Rules
Validation rules prevent bad data being saved in your table. Basically, they look like criteria in a query. Learn how and when to use Validation Rules on your fields and tables, in Microsoft Access databases.


Table Field Validation Rules triggering in Forms
I have noticed that

If Me.dirty then Me.Dirty = False

doesn't trigger Table field validation Rules.

Why not?

How can I trigger Table Field validation Rules using VBA when the user clicks the Save button?


Create a validation rule to validate data in a field
This article explains how to add validation rules to a database. Validation rules restrict what users can enter in a given field, and also help ensure that your database users enter the proper types or amounts of data.
What do you want to do? -Understand validation rules, -Validate data during entry in table fields, -Validate data during entry in forms, -Validate data during import operations, -Validation rule reference.


Validation rules
Validation rules prevent bad data being saved in your table. Basically, they look like criteria in a query.
You can create a rule for a field (lower pane of table design), or for the table (in the Properties box in table design.) Use the table's rule to compare fields.
There is one trap to avoid. In some versions of Access, you will not be able to leave the field blank once you add the validation rule, i.e. you must enter something that satisfies the rule. If you need to be able to leave the field blank, add OR Is Null to your rule. (Some versions accept Nulls anyway, but we recommend you make it explicit for clarity and consistency.)
This article explains how to use validation rules, and concludes with some thought provoking on when to use them.


Multiple Validation Rules
I need to input two validation rules for date fields. Here are the specifics:

1. Field1 is called [Purchase_Date]. Any data must be in or after 1959, so the validation rule I entered is >#12/31/1958#.
2. Field2 is called [Labor_Date]. Any data must be not only in or after 1959, but must also be on or after [Purchase_Date] (labor cannot be performed until after payment is received). I initially thought I may need two validation rules, both >#12/31/1958# and [Labor_Date]>=[Purchase_Date].

Is this even close to right? When I typed these codes concurrently into the validation rule box for Field2, I came up with a syntax error. I then tried just the latter rule by itself, knowing that the Purchase_Date used as a comparison in Field2 is already after 12/31/1958...


Validation rules
I have a form, two of the fields are Comment which is a text box and Update which is a combo box with a list of names. I am trying to prevent someone selecting his name as having updated the record but leaving the Comment field blank. Have tried validation rules on the Combo box but think I need some code to make this happen


Field rules/validation rules
I have a table which consists of field names like ID, Unit, DATE, Time, Site. Time means either AM, PM, LUNCH.

Each date (eg. 2nd March, 2012) could have 3 different TIME. Each date and time is stored in different rows/as separate record

How do I set the rules to my query or my table that 2nd march of TIME - PM cannot be a repeat and so on? I know how to set rules for each field in the table itself but my problem is 2nd March could be repeated 3 times in that column and Time could be repeated too and if 2nd March, 2012 of TIME - PM already exits, Access should warn the user.


Access Data Validation
This article details how to create your own Access 2000 validation routines. While Access 2000 has its own validation rules that you can create for each control, I've found it easier to use Visual Basic techniques to validate data.
You may wonder why these validation routines were created in Access when the data types and bound controls could prevent most of the data errors. In truth, I use these routines to validate using Active Server Pages by converting the validation routines to Javascript. The Javascript was converted to vbascript and run in this Access 2000 demonstration.
You may find creating your own validation routines more flexible and functional than the built-in validation rules in Access.


Access 2010 Field Validation Rule & Message
In Access, Field Validation lets user to validate the data entry by applying desired constraints over the field, it also facilitates users to show the messages in case of any invalid data entry field. By writing simple expression in validation fields you can collate entries from different fields and apply rules over them. Expressions are used in many places to perform calculations, manipulate characters, or test data. You can apply different expression over tables, queries, forms, reports, and macros for validation. This post will describe the most easiest way to apply rules and show messages in case of any invalid data entry.


validation field based on combox box column data
herewith my issues and explanation:-

for example:
combo box in Form
column(1) (2) (3)
stock code item balance
B12536 blouse 5
P12356 Pant 10

For stock issue, I will select the stock code from combo box and key in quantity out, but need to set validation to this qty out field to <=combox box, column(3), that means if stock code B12536 selected, qty out validate <=5 only, should not more than stock balance qty. how do I set this validation rules in qty out field? I did set this rules in Ms Access 2003, however, it's unable to run in Ms Acess


Validation Rules
I am making a database that is used to enter Quality Control data. In order to prevent erroneous entries, I am setting up validation rules (for example the measured pH has to be between two certain values). This is easy enough to do when those numbers are fixed, but I want those to be able to be changed easily. Since there are several tables that have the same bounds, I want to have one place where they can be changed and have it update to all of the necessary tables.

For example, I tried making a Bounds table with fields such as pHMin, pHMax, etc. I want the validation rule to be able to say something like:

"Between Bounds.pHMin and Bounds.pHMax"

Then when I go to the Bounds table I can put in any value I want for pHMin and pHMax and have that validation rule use those values. Unfortunately, this doesn't work.


Validation Rules to measure pH
I am making a database that is used to enter Quality Control data. In order to prevent erroneous entries, I am setting up validation rules (for example the measured pH has to be between two certain values).

This is easy enough to do when those numbers are fixed, but I want those to be able to be changed easily. Since there are several tables that have the same bounds, I want tohave one place where they can be changed and have it update to all of the necessary tables.

For example, I tried making a Bounds table with fields such as pHMin, pHMax, etc. I want the validation rule to be able to say something like:

"Between Bounds.pHMin and Bounds.pHMax"

Then when I go to the Bounds table I can put in any value I want for pHMin and pHMax and have that validation rule use those values. Unfortunately, this doesn't work. Is there a way to getAccess to do this?


Form Validation Rule
I have a form in which there are fields that have validation rules for the quantity and types of characters that are entered by the people on the production floor. The operators are wanting me to refine this so that if they accidentally enter or scan the wrong information, the affected field will automatically be cleared of the previously-entered contents (after theyclear the validation error pop-up window). How can I accomplish this?


Microsoft Access 2007: Including Data Validation
In this video, you will learn how to add data validation to a Microsoft Access database. Skills taught include: adding data validation rules, adding data validation text, changing a view, limiting the field to one of two values, disallowing characters, restricting values, and ensuring one date is greater than a second date.


about validation rules
I want to have more than one validation rule to my table

how can I do that? (should I sepreate them by "and")

other ques.
how can I write the following expression as a validation rule for my table:

if I enter 1 in field1 then, field2 must be 3 otherwise it must be 1


Is entry text only?
I need to enforce some data entry validation rules.

I tried with using the validation property. It works, but the message sent to the user is useless and will not work for our needs. So, as such, I have switch to using a BeforeUpdate event to perform the validation.

That said, I can't seem to find any function which checks if an entry is only made of alphabetic characters (similar to the validation rule : Is Null OR Not Like "*[!a-z]*").

Can some explain how I can reproduce this using VBA so I can send my own message to the user.


Business Rules
Am new to Acccess and am taking a class called Database Theory and wonder when your given a set of business rules does that mean you are to establish a table for each rule?


Clearing a field after validation rule pop-up window
I have a form in which there are fields that have validation rules for the quantity and types of characters that are entered by the people on the production floor. The operators are wanting me to refine this so that if they accidentally enter or scan the wrong information, the affected field will automatically be cleared of the previously-entered contents (after they clear thevalidation error pop-up window). How can I accomplish this?


(Access) Clearing a field after validation rule pop-up window
I have a form in which there are fields that have validation rules for the quantity and types of characters that are entered by the people on the production floor. The operators are wanting me to refine this so that if they accidentally enter or scan the wrong information, the affected field will automatically be cleared of the previously-entered contents (after they clear thevalidation error pop-up window). How can I accomplish this?


Validation rules for particular format
Can someone tell me what is the validation rule for entering data in a particular format? For e.g, BookID must be in the format A999(for e.g,Hau344) .values out of this format are not accepted(e.g,H4s09)!