Solved

Dcount unique

Posted on 2016-11-14
6
37 Views
Last Modified: 2016-11-15
Experts, I have a count in a query but need to count only the unique ID's.  How could I modify the following statement:  
DCount("[ID]","qryOutstanding_2") AS [Count]

thank you

sql:
SELECT qryBal2_Works.FacilityType, qryBal2_Works.Utilized, tblType_dropbox.Type, DCount("[ID]","qryOutstanding_2") AS [Count]
FROM qryBal2_Works INNER JOIN tblType_dropbox ON qryBal2_Works.FacilityType = tblType_dropbox.ID
WHERE (((tblType_dropbox.Type) Like "Working*"));
0
Comment
Question by:pdvsa
6 Comments
 
LVL 50

Expert Comment

by:Ryan Chong
ID: 41887477
quick try:

SELECT qryBal2_Works.FacilityType, qryBal2_Works.Utilized, tblType_dropbox.Type, 
(select count(*) from (select ID from qryOutstanding_2 group by ID)) as  AS [Count]
FROM qryBal2_Works INNER JOIN tblType_dropbox ON qryBal2_Works.FacilityType = tblType_dropbox.ID
WHERE (((tblType_dropbox.Type) Like "Working*"));

Open in new window

0
 
LVL 27

Expert Comment

by:MacroShadow
ID: 41887479
Use Allen Browne's ECount. ECount() offers an extra argument so you can count distinct values. The other arguments are the same as DCount().
0
 
LVL 50

Accepted Solution

by:
Ryan Chong earned 500 total points
ID: 41887480
typo for my comment, you can try this instead:
SELECT qryBal2_Works.FacilityType, qryBal2_Works.Utilized, tblType_dropbox.Type, 
(select count(*) from (select ID from qryOutstanding_2 group by ID)) AS [Count]
FROM qryBal2_Works INNER JOIN tblType_dropbox ON qryBal2_Works.FacilityType = tblType_dropbox.ID
WHERE (((tblType_dropbox.Type) Like "Working*"));

Open in new window

0
U.S. Department of Agriculture and Acronis Access

With the new era of mobile computing, smartphones and tablets, wireless communications and cloud services, the USDA sought to take advantage of a mobilized workforce and the blurring lines between personal and corporate computing resources.

 
LVL 13

Expert Comment

by:John Tsioumpris
ID: 41887484
The problem lies to qryOutstanding_2...you should have the query to return only unique values and then perform the Dcount....
0
 
LVL 57
ID: 41887533
And just as an aside, you should not be using Domain functions inside a query as you are guaranteeing yourself poor performance (the query optimizer cannot cost it).   Use another query and join to it, or sub-selects as Ryan showed.

 All the Domain functions are nothing more than a SQL statement with a wrapper, so there's no reason not to write it directly in SQL.

 They were only intended to be used in places where SQL was not allowed.

 This is one of the main reasons you hear about Access apps that die after 5 or 6 users.

Jim.
0
 

Author Closing Comment

by:pdvsa
ID: 41887659
Perfect.  thank you.
0

Featured Post

Use Case: Protecting a Hybrid Cloud Infrastructure

Microsoft Azure is rapidly becoming the norm in dynamic IT environments. This document describes the challenges that organizations face when protecting data in a hybrid cloud IT environment and presents a use case to demonstrate how Acronis Backup protects all data.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Modal form 11 30
Trying to open FORM in specific record !! 6 45
How can I create a Message box thru a Macro action for yes / No? 26 59
Access Open Report with SQL Parameter 11 30
Introduction The Visual Basic for Applications (VBA) language is at the heart of every application that you write. It is your key to taking Access beyond the world of wizards into a world where anything is possible. This article introduces you to…
A simple tool to export all objects of two Access files as text and compare it with Meld, a free diff tool.
Using Microsoft Access, learn some simple rules for how to construct tables in a relational database. Split up all multi-value fields into single values: Split up fields that belong to other things into separate tables: Make sure that all record…
In Microsoft Access, when working with VBA, learn some techniques for writing readable and easily maintained code.

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question