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Field rules/validation rules

Field rules/validation rules
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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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Validation Rules

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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.
 

Restrict data input by using validation rules

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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.
 

Table Field Validation Rules triggering in Forms

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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?
 

Validation rules

Preview
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

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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

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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

Preview
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 2010 Field Validation Rule & Message

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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.
 

Access Data Validation

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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.
 

validation field based on combox box column data

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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