Query To Return Only Most Recent Unique Values
Sep 22, 2015
I have a set of devices that are assigned to a truck, on occastion they are moved from truck to truck, I need to be able to track where they are AND where they have been. Here is what I have:
ID (autonumber)
GPS ID (number, this is the specific ID to each device)
Truck Number (this is the specific ID for each truck
Installation Date (Date installed / moved)
I have created a query to show the data I need, I have put them in order based on date.
- I must keep each event stored on the table
Goal:
To show a list of the current location of each device, nothing more.
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Aug 18, 2014
I have two tables with a one to many relationship. The tables are linked by the INDEX column.
EXAMPLE:
Code:
TABLE_1
INDEX NAME
1 Name_A
2 Name_B
3 Name_C
TABLE 2
INDEX NUM_INDEX STATUS
1 1 REJECTED
1 2 REJECTED
1 3 OPEN
2 1 CLOSED
3 1 REJECTED
3 2 OPEN
I need the NAME field from TABLE_1 and the Last STATUS field from TABLE_2 (MAX of NUM_INDEX).
Example:
Name_A, OPEN
Name_B, CLOSED
Name_C, OPEN
SQL that I have now.
Code:
SELECT A.FIN_Finding_Number, B.Max_Index
FROM TBL_Findings AS A INNER JOIN (SELECT RES_Finding_Index, Max(RES_Response_Index) As Max_Index
FROM TBL_Response GROUP BY RES_Finding_Index ) AS B ON A.FIN_Finding_Index = B.RES_Finding_Index
WHERE (((A.FIN_Finding_Index)=34));
This SQL statement will return me the Finding_Number and Max_Index. I don't need the Max_Index. I need the Status. If I put the Status in the Sub-Query and GROUP BY it, it will return both REJECTED and OPEN. I just need it to return OPEN.
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May 7, 2014
I have a table of accounts and a table of rates. There is a one-to-many relationship between them (i.e. each account can have multiple rates, each with their own - unique - effective date)
I'm trying to build a query which will show me all of the accounts in the accounts table and the most recent rate (based on the effective date) for each of those accounts.
This is as far as I've gotten with the SQL :
Code:
SELECT [tblAccounts].[AccountID], [tblAccounts].[AccountNumber], [tblAccounts].[AccountName], [LatestRate].[IntRate], [LatestRate].[EffectiveDate]
FROM [tblAccounts]
LEFT JOIN
(SELECT TOP 1 [tblRates].[AccountID], [tblRates].[IntRate], [tblRates].[EffectiveDate]
FROM [tblRates]
ORDER BY [tblRates].[EffectiveDate] DESC) AS LatestRate
ON [tblAccounts].[AccountID] = [LatestRate].[AccountID]
But this can't work because the [LatestRate] subquery can only ever return one record (i.e. the most recent rate across all of the accounts)
I need the most recent rate for each of the accounts in the main query
(FYI - I use an outer join as it is possible for no rate to be available in the rates table for a given account, in which case I want to return the null value rather than omit the account from the resulting dataset...)
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Oct 16, 2007
Hi,
I've been given a flat-file database to 'improve'. One field is simply titled 'Room' and refers to a room number in a school. I want to create a MakeTable query that will run through all the records and make a table containing one instance of each room number (for normalizing). Hope that makes sense!
Any help much appreciated,
Steve
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Jul 22, 2005
Using MS Access XP
Here's the scenario. I have 3 fields [AgentID], [QA Date], [Points Issued]. What I want to do is run a query that will give me the last date [QA Date] a point [Points Issued] was issued for each agent [AgentID]. And I want the query to display all 3 fields according. Is this possible?
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Nov 29, 2005
I don't know if I'm going about this problem correctly. In a nutshell:
I have a table which contains a number of fields, only a two of which are important for this task, as indicated below.
| ID | Type |
Where ID is an alpha-numeric identifier (say a store number), and there are three potential types, plus Null values. For this, we'll assume the three types are Fruit, Vegetable, and Grain (plus Null).
An example dataset might look like:
0-4 Vegetable
1-2
0-1 Grain
1-2 Fruit
0-4 Vegetable
1-2 Vegetable
0-1
0-2 Fruit
0-4 Grain
1-2 Fruit
0-4
0-1 Vegetable
0-3 Fruit
If I want to know how many stores have Vegetable, I could put "Vegetable" as the criteria in the query and set UniqueValues to Yes. Then I would get three unique values, one for each Vegetable existing at a unique store.
But, what if I want to know at which stores Fruit exists and Vegetable DOES NOT. Is there a way within Access to find all the records with "Fruit" as the criteria and then eliminate those with ID numbers matching the dataset with "Vegetable" as the criteria?
In other words, if I do my "Vegetable" criteria I end up with the resulting dataset:
0-4 Vegetable
1-2 Vegetable
0-1 Vegetable
If I then use "Fruit" as my criteria, I get the following dataset:
1-2 Fruit
0-2 Fruit
0-3 Fruit
Since Store 1-2 has Vegetable, I want to eliminate it from the list so that my resultant list is:
0-2 Fruit
0-3 Fruit
Is that possible?
Sorry for the long bizarre example, but I thought it the easiest way to make the situation clear. I'd really appreciate any suggestions anyone has on dealing with this situation!!
Thanks
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Jan 13, 2015
I have the following code:
Code:
Dim rs As DAO.Recordset
Dim db As Database
Dim strSQL As String
Set db = CurrentDb
strSQL = "SELECT DISTINCT tbl_contract_lev.ContractID FROM (tbl_leverancier_gegevens INNER JOIN
[Code] ....
The result of the query is a list fo unique values but by including the "count" function in SQL seems not te be working in combination with "DISTINCT"...
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May 25, 2006
I have a query that uses a linked table from an external database and joins it with a table from my database to return records that contain the same values.
Is there a way to return only the records that are present in the external database and not in my db?
Thanks
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Dec 10, 2007
Hi All,
I need an Access query to return the rate at which a customer should be charged. A customer's rate can be set for a period of 1 to 6 months and the customer's rate table could look like this:
ACCOUNT_ID........START_DATE........END_DATE...... ..COST_PER_UNIT
31308.................01-Apr-07................30-Jun-07.................6.195
31308.................01-Jul-07.................31-Aug-07.................6.304
31308.................01-Sep-07................31-Mar-08.................5.422
31308.................01-Apr-08.................31-Aug-08.................6.304
I need a query (preferrably SQL) that will return the rate a customer should be charged each month, e.g.
31308 / Aug 07 / $6.304
31308 / Sep 07 / $5.422
31308 / Oct 07 / $5.422
etc, etc
I'm using Access 2003 and the rates table contains details of about 2500 customers.
Any ideas would be welcomed.
PS. Can someone tell me how to paste a table straight from Excel into the forum post body???
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Feb 22, 2012
I have two tables: tblStudents and tblEnrollments. The query I have designed shows the StudentID and counts the number of Enrollments that each student has. I want the students who don't have any enrollments to still show up and have a 0 by their ID. Right now, only the students with enrollments show up in the query results.
Here is my SQL Statement:
SELECT tblStudents.StudentID, Count(tblEnrollments.EnrollmentID) AS CountOfEnrollmentID
FROM tblStudents INNER JOIN tblEnrollments ON tblStudents.StudentID = tblEnrollments.StudentID
GROUP BY tblStudents.StudentID;
What do I need to do to it to have null values display as zero?
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Oct 1, 2013
One Manifest can have many line items. One line item can only have 1 designation. Each manifest may have many line item with same designations.
For example:
Manifest #0001
Line Item 1: N
Line Item 2: H
Line Item 3: U
Line Item 4: N
Line Item 5: P
Line Item 6: H
Table set-up
CurrentCY
CurrentCYIDPK
WasteCategoryIDFK
LineItemInformation [Line Item 1, Line Item 2, etc]
ManifestDataIDFK
ManifestData
ManifestDataIDPK
ManifestNumber [0001]
WasteCategory
WasteCategoryIDPK
WasteCategory [H, N, U, etc]
I'd like to query the line items for each manifest so the end result has the manifest number (Manifest #0001) in a field and the designations (N, H, P, U) in fields on a report.
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Aug 2, 2014
I have a table that has a list of tasks and checkboxes attached to them to be checked once the task is completed. I need to run a query on the table that will only bring me back the tasks with a completion that is false.
Everything that I read online indicates that this is a difficult task for access. Maybe I can accomplish this in SQL view instead of design? If I put false is all of the yes/no fields, the query brings back nothing.
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Jan 11, 2014
Trying to run a query where each 4 fields calling a custom function will not just re-run the same custom function over and over again for each field in a single record.
A Function has a huge amount of multiple queries and logic to perform.The Function returns a Integer, Integer, Integer, and optional Integer. Each integer requires a DLookup to lookup a String description value for each individual integer (in each of 4 fields).
The problem is, the DLookup in each column that runs against each of the integers re-run the same function.The result is that a single record, each of the 4 columns returning a single of the 4 values, the complex function is re-run 4 times.
The function is huge, part of a Business Rules Engine. Depending on the Rule-Meta data - it might launch up to a dozen queries and perform logic steps for each record. This is not the ordinary SQL Query.
Imagine if one record (for 1 field) takes 0.1 second to run. By referencing the function in 4 columns, this same function is re-run 4 times (0.4 Seconds) Against 50,000 records - this duplication of re-running the function for each column can really add up.
Possible Solutions: Researched Class Modules - There is a comment that the property Get, Let actually reduce performance. There are huge advantage of code documentation, documentation and centralization.It doesn't claim class modules reduce execution as each propery is returned. It also describes that Class Modules can't be called directly in a Query - unless each property is wrapped in a function.
Function Returns one String with delimiters: e.g 34;54;55;1 This single column goes into a Make Table (runs function one time per record) Then the D-Lookup is run against static local data. This pevented the function from being run over and over across the network linked data.
Final Solution: Eventually, the many hundred lines of VBA code for the Rules Engine will be converted into SQL Server T-SQL Functions on the server.For a Rule Engine development, Access has been great for a rapid protoype development and testing. The TSQL will be a final big step requiring re-coding. It is not currenty my option for the delivery time frame.
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Oct 24, 2007
Hi
I have a query that runs off three tables: These are tbl_contacts, tbl_status, tbl_publications. All contacts have a status but not all will have a publication. The problem is that when i run the query on a status type where none of the contacts for that status have a publication it will return no results, where what I actually need is for it to just return the details of those contacts for that status. The whole query runs off a form with combo boxes.
grateful for any advice
Shapman
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Dec 5, 2014
I have the following dataset in a table called NR_PVO_120. How do i pick out a number (which can change but let's say, 6) of UNIQUE OtherIDs without excluding any OtherIDs under any fax numbers?
So, if you pick OtherID from Row7 you then also must pick OtherIDs from rows 8 and 9 because they have the same fax number. Basically, once you pick an OtherID you're then obligated to pick all OtherIDs that have the same fax number as the one you picked.
If the number requested (6 for this example) isn't possible then "the closest number possible but not exceeding" would be the rule.
For example, if you take OtherIDs from rows 1-10 you will get 6 unique OtherIDs but row 10 shares a fax with rows 11 and 12. You either need to take all 3 (but that will raise the unique count to 8, which isn't acceptable) or skip this OtherID and find one with a fax that has no other OtherIDs and that isn't on the result set already. My result of 6 UNIQUE OtherIDs will need to contain ALL OtherIDs under any fax the existing OtherIDs are connected to.
So one solution is to take rows 1-6, 26. Another is to take rows 1-4,10-14.
There will be many possibilities (the real dataset has tens of thousands of rows and the number of people requested will be around 10K), as long all OtherIDs connected to all faxes on the result set are part of the requested number (6 in this case) any combination would do.
A few notes.
1.Getting as close as possible to the requested number is a requirement.
2.Some OtherIDs will have a blank fax, they should only be included as a last resort (not enough OtherIDs for the requested number).
my table (NR_PVO_120)
Row OtherID Fax
1 11098554 2063504752
2 56200936 2080906666
3 11098554 7182160901
4 25138850 7182160901
5 56148974 7182232046
6 56530104 7182234134
[code]....
A few sample outputs
one solution is taking rows 1-6 and 26.
OtherID
11098554
56200936
25138850
56148974
56530104
56148975
Another solution is taking rows 1-4 and 10-14.
OtherID
11098554
56200936
25138850
56024315
56115247
56148974
This is for a fax campaign, we need to make sure no fax number is faxed twice, that all people connected to that fax number are contacted under one fax sent.
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Sep 20, 2005
Not sure if I worded my subject correctly. Here's my problem.. I've used query to combine 2 tables of data..
Here are my fields..
I've assignment_num field, project_num field, project_name field, emplyee_name field.
here are my data..
assignment_num field: 1001, 1002, 1003, 1004, 1005
project_num field: 20,20,15,16,15
employee_name field: tom peter, tom peter, tom peter, julie, sally
What I want is to display the employee name with 2 projects or more...
What i have done?
I've done a group by and then count project_num field.. I also added a condition whereby the countofproject_num > 1.. everything went well except that the countofproject_num display 3 instead 2..
pls help.
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Apr 23, 2007
Here is my sample DBA
I'd like to solve this issue
when I open my Quotations form I'd like a set of services to be selected by default, ex: Brush and Pen. So the user only has to input the quote amount
is there anyway to have the form open with a script like:
"on open (or on load). in subform SELECT refproduct where product from tblproducts = 1 and also SELECT refproduct where product from tblproducts = 4"
Therefore when my main form opens, in the subform I have already Brush on the 1st line selected and pen on the 2nd. My user only has to type the price.
Thanks for your much appreciated help
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May 2, 2013
I have a query to find only the unique clients that have attended an event during a time period
I can only get the event and client for each event
So I want a query that returns the clientID for any client that attended any event.
I have tried using the return unique values in the property sheet but that still gives me multiple clientIDs with each event they attended.
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Feb 7, 2014
i have one table in which ID is Primary ID with Different Values
Like
ID NAME PAN
1 A X
1 B Y
1 A X
2 C Z
2 C G
3 D U
it shows that ID 1 having 2 Name (A& B,with PAN, X & Y ,respectively).how can i get this that ID having More than 1 Value like 1 and how can i select only these records ID which having more than 1 value and how can i update values for 1 ID.
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Feb 19, 2008
Hello all
I'm sure the answer is on here somewhere but trying to find it and then getting it to work is a bit of a problem, so i resorted to posting.
I have 5 tables
Partnership Details, Invoices, Funding, Communication, Communication Types.
the field Partnership Name in the Partnership Details table has a one to many relationship with the partnership name on tables: Invoices, Funding and Comunication.
What I want to do is create a query that will show the most recent invoice (detirmined by date) and the most recent funding (detirmined by date) for each partnership.
I can do this using max if I only want the feilds Partnership name, invoice date and funding date. however I want to create a report that will show several feilds from partnership details and I want to show the invoice no. and amount as well as the date and also the amount and notes field for funding
Is anyone able to help?
Thanks
Niyx
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Mar 1, 2007
I have a query that has an Item, ItemPrice, Allocation, and DatePurchased ordered by DatePurchased with only unique values.
I'm using it for a PO Database, when entering items purchased, I have the Item field populated with a items previously purchased, when the item is selected the Unit Price and Allocation Fields are autofilled in with the most recent values from the PO details table.
My problem is if I purchase 10 of the same Items on 10 different dates then the combo box will show 10 of the same Items, because they are not unique values because of the DatePurchased.
What I want is a query to show one unique Item entry with the most recent Purchase Price. I can get a list of unique Items, by only making a query of those and showing only unique values, but as soon as the date is introduced it no longer works, for obvious reasons.
Any help appreciated,
JOe K.
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Jan 15, 2008
I have a database to track client activity per session.
Each client has a unique client number but multiple activities.
Therefore, if I have 20 clients in the database and each has 3 activities, I have 60 client numbers, 3 *20 = 60. ( Duplicated)
My elementary problem is how do I display the client activity unduplicated so that my query returns only 1 unique client number per session.
I tried the unique records/values in the property box but still.....
Thanks for your help.
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Oct 4, 2006
Hi,
I have a situation and i do not know how to handle it.
I am developing an application for a lawyer. In the data base i have the following tables: Files, the people table (that are involved in a lawsuit), and other tables. The problem is the following: in the people table, beside the primary key i have another unique element that is social security number.
In the files table beside the primary key another unique element exists: the number and date of the file (File 1 from 15.02.2006). A lawsuit file can have more law terms: today it has one law term and maybe next week another law term so i must have the same file many times in the table with the same code and another date, but i cannot add the same file many times in the data base because a file has data about one person and the social security number of the person is unique.
If anyone can offer me a solution it would be good.
Thank you!
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Oct 25, 2006
Hi guys,
I've tried searching all the threads for an answer to my problem and I can't seem to find it....
Ok I know this should be simple...
I know to use Distinct and DistinctRow to only show unique records in a combobox but all I want to do is that once a selection is chosen in the combobox to add a record to a subform, it can't be selected again.
I know in some cases you do, e.g. items on an invoice sometimes need to be entered more than once, but I'm listing Skills for Employees and I only want a user to enter a Skill once per Employee (although Employees can have many Skills, I just don't want a User to accidentally put the same Skill in twice or more per Employee...)...
What's the best optimized way of achieving this?
Sorry for my newbiness.
dazza61
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Oct 25, 2006
Hi guys,
I've tried searching all the threads for an answer to my problem and I can't seem to find it....
Ok I know this should be simple...
I know to use Distinct and DistinctRow to only show unique records in a combobox but all I want to do is that once a selection is chosen in the combobox to add a record to a subform, it can't be selected again.
I know in some cases you do, e.g. items on an invoice sometimes need to be entered more than once, but I'm listing Skills for Employees and I only want a user to enter a Skill once per Employee (although Employees can have many Skills, I just don't want a User to accidentally put the same Skill in twice or more per Employee...)...
What's the best optimized way of achieving this?
Sorry for my newbiness.
dazza61
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Feb 17, 2005
I have the following SQL definition:
SELECT DISTINCT tblFile_Management_Received.Claim_Number, tblFile_Management_Received.Date_Checked_In, tblFile_Management_Received.Checked_In_By, tblFile_Management_Received.Copy_or_Original
FROM tblFile_Management_Received;
The results would show as:
ClaimNumber Date Checked In Checked In By Original or Copy
111111111 2/16/2005 8:34:24 AM XXXX Yes
111111111 2/16/2005 1:23:19 PM XXXX Yes
222222222 2/16/2005 8:34:52 AM XXXX Yes
222222222 2/16/2005 1:24:49 PM XXXX Yes
I am trying to use "Distinct" to show the following records when the query is ran (the desired results would be each unique claim number based on the earliest check in date):
ClaimNumber Date Checked In Checked In By Original or Copy
111111111 2/16/2005 8:34:24 AM XXXX Yes
222222222 2/16/2005 8:34:52 AM XXXX Yes
Can anyone help me with this??
Any help is greatly appreciated.
Thanks
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