Solved Complex query: GROUP BY EACH Latest account balance (1 Viewer)

ironfelix717

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HI,

I need to write a query that finds the "closest" account balance to a specified date for each account in the system. I've tried this for hours. I'm done messing around and getting nowhere.

There are 2 tables: Accounts & Transactions.

I need to group the Transactions by each Account in 'ACCOUNTS' (or really doesn't even need to be linked to Accounts - see below).

Then find the 'BALANCE' closest to a specific date. - FOR EACH account

This query needs to return each unique account name. Note: Record in 'Transactions' will never have an account that doesn't exist in Accounts table. (see bold above)


Example question: List the balance for each account in transactions on 10/18/19
 

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plog

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This has a whiff of homework to it. Which is fine, but in these instances you will need to tell us what you have tried and how its not working.

So, write/describe the way you think it should be tackled adn we will guide you there.
 

arnelgp

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if the transaction are well inputted, meaning it is inputted as the transaction occurs and not by bulk entry (where you enter a transaction in no particular order). then you can create a Total query first, grouped by Account, order by Date descending, ID descending (see Query1).
create another Parameter query and plug in Query1 (see FinalQuery).
 

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ironfelix717

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Hi,

Returning with more information. Thanks for your replies.

I left out a key point: the data is not well inputted, meaning the IDs do not necessarily scale with the time order of the data. Therefore, arnelgp's query will not work. This is also a problem I ran into.

However,

On that note, it should be noted that: Although the IDs may be essentially random, the HIGHEST ID for a given date takes precedence over any other IDs of the same date which are less.

For example:

#1 12/1/19 500
#2 12/2/19 600
#3 12/1/19 450

450 (#3) is the value considered to have occurred LAST on 12/1/19.


Its fair to say, you need a minimum of 2 queries with this request. All I need is the ID of the closest value and i can join the rest of the required fields. This is a completely simple query when just querying for a single account, but when trying to return every account is when things get complicated.
Thanks for any help!


Learn SQL they said, its powerful they said (n)
 

plog

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First, [Date] is a terrible field name. It's a reserved word and makes coding more difficult. I suggest you rename it for what date it represents (TransactionDate). Onto the SQL. Since you can have multiple balances per data, you need a query to find the right ID per date:

Code:
SELECT Account, [Date] AS BalanceDate, Max(ID) AS BalanceID
FROM TRANSACTIONS
GROUP BY Account, [Date];
Name that SQL 'sub1'. Now you need a query where you can set the data criteria and get the highest date in Transactions that meets that criteria:

Code:
SELECT Account, Max(BalanceDate) AS LastDate
FROM sub1
WHERE (BalanceDate<#11/1/2019#)
GROUP BY Account;
Name that 'sub2' and change 11/1/2019 to whatever you want. Then for the final query this will produce the results you want:

Code:
SELECT sub2.Account, sub2.LastDate, TRANSACTIONS.Balance
FROM (sub2 INNER JOIN sub1 ON (sub2.LastDate = sub1.BalanceDate) AND (sub2.Account = sub1.Account)) INNER JOIN TRANSACTIONS ON (sub1.BalanceDate = TRANSACTIONS.Date) AND (sub1.Account = TRANSACTIONS.Account);
 

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