Microsoft access dlookup query

This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? Tip Although you can use the DLookup function to display a value from a field in a foreign table, it may be more efficient to create a query that contains the fields that you need from both tables and then to base your form or report on that query.

You can also use the Lookup Wizard to find values in a foreign table. In this article. An expression that identifies the field whose value you want to return. It can be a string expression identifying a field in a table or query, or it can be an expression that performs a calculation on data in that field.

A string expression used to restrict the range of data on which the DLookup function is performed. If criteria is omitted, the DLookup function evaluates expr against the entire domain. Any field that is included in criteria must also be a field in domain ; otherwise, the DLookup function returns a Null.

The DLookup function returns a single field value based on the information specified in criteria. Although criteria is an optional argument, if you don't supply a value for criteria , the DLookup function returns a random value in the domain.

If no record satisfies criteria or if domain contains no records, the DLookup function returns a Null. If more than one field meets criteria , the DLookup function returns the first occurrence.

You should specify criteria that will ensure that the field value returned by the DLookup function is unique. You may want to use a primary key value for your criteria, such as [EmployeeID] in the following example, to ensure that the DLookup function returns a unique value:.

Whether you use the DLookup function in a macro or module, a query expression, or a calculated control, you must construct the criteria argument carefully to ensure that it will be evaluated correctly. You can use the DLookup function to specify criteria in the Criteria row of a query, within a calculated field expression in a query, or in the Update To row in an update query.

You can also use the DLookup function in an expression in a calculated control on a form or report if the field that you need to display isn't in the record source on which your form or report is based. To look up ProductName from a Products table based on the value in the text box, you could create another text box and set its ControlSource property to the following expression:. Although you can use the DLookup function to display a value from a field in a foreign table, it may be more efficient to create a query that contains the fields that you need from both tables and then to base your form or report on that query.

Note: Unsaved changes to records in domain aren't included when you use this function. Why would you use a DLookup rather than a join? In reply to boblarson's post on October 2, This works, I hadn't considered that there may not be any values on Dec But I now have every daily value showing the year end value, is it possible to filter out all other dates except year ends?

In reply to Scottgem's post on October 3, The data is daily day on day closing figures for a tracked supply and is in one MS Access table that has 2 columns - Dates the date , PXLast the day's closing figure. I have daily data from Jan to Aug and I wanted to give a percentage change at every year end compared to last year year end as follows: Year Percentage Change Year on Year.

I was hoping with a dlookup I would get the end of year values, I am using the below SQL statement for get the fields Dates, Daily PXlast value and the value at end of year. Is there a better way of doing it?

Here are the following circumstances explained to learn briefly about how to use Dlookup Function in Access. This happens because you are attempting to assign a null value to the variable strX. In order to avoid this error message, you can make use of the IF statement to check whether there is a record found before allotting the result value to the strX.

Well, it is the simplest way to use DLookup function; i. DLookup MS Access function is also used to look at the information on the query. In the above example, LDate is used as a variable that will keep the OrderDate value of the Orders table.

From this Orders table, OrderID is used in the code. Hopefully, all the aforementioned information about MS Access DLookup function seems helpful to you in easy access of this DLookup function in Access Database from now onwards. If you stuck into any further issue regarding DLookup Access function then ask in our comment section. You will surely get an immediate response to your query. Pearson Willey is a website content writer and long-form content planner.

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