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Use Dlookup For A Quick Way To Find Items in a Table or Query

These are two examples of using the Dlookup command.

Program Code

' ***********************************************************************
' Loop Through Numerous Dlookup commands - varPersonID is a variant
' ***********************************************************************
For lngEEIDKeyIndex = LBound(lngEEIDKeyValues) To UBound(lngEEIDKeyValues)
    varPersonID = DLookup("[PersonID]", "EmployeeData", "[EEID] = " & lngEEIDKeyValues(lngEEIDKeyIndex))
    If Not IsNull(varPersonID) And varPersonID <> 0 Then
        lngPersonCount = lngPersonCount + 1
        ReDim Preserve lngPersonKeyValues(1 To lngPersonCount)
        lngPersonKeyValues(lngPersonCount) = varPersonID
    End If
Next lngEEIDKeyIndex
Exit Sub

' ***********************************************************************
' Get The Rep Code and Name - Note varRepName is a Variant Data Type
' ***********************************************************************
strRepCode = recIn!SalesRep
varRepName = DLookup("[RepName]", "qryFCSTSalesRepCodesUnique", "[RepCode]=" & """" & strRepCode & """")
If Not IsNull(varRepName) Then
    strRepName = varRepName
Else
    strRepName = ""
End If

Syntax Examples

General: DLookup Usage Samples
Author
Dev Ashish
Note that the same logic applies to most Domain Aggregate Functions (DMax, DMin etc.)

Normal usage

For numerical values:
        DLookup("FieldName" , "TableName" , "Criteria = n")

For strings: (note the apostrophe before and after the value)
        DLookup("FieldName" , "TableName" , "Criteria= 'string'")

For dates:
        DLookup("FieldName" , "TableName" , "Criteria= #date#")
 
Refering to a form control

For numerical values:
        DLookup("FieldName", "TableName", "Criteria = " & forms!FormName!ControlName)

For strings: (note the apostrophe before and after the value)
        DLookup("FieldName", "TableName", "Criteria = '" & forms!FormName!ControlName & "'")

dates:
        DLookup("FieldName", "TableName", "Criteria = #" & forms!FormName!ControlName & "#")
 

Mix-n-Match

   DLookup("FieldName", "TableName", "Criteria1 = " & Forms!FormName!Control1  _
             & " AND Criteria2 = '" & Forms!FormName!Control2 & "'" _
            & " AND Criteria3 =#" & Forms!FormName!Control3 & "#")