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Inventory question (one table)

Posted on 2012-12-21
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Last Modified: 2012-12-27
Hi

I am using Access 2010

I have two tables.

1)   tblEntities   <field>  [EntityID]

2)   tblTransactions <fields>       [StockNum]   [Src_EntityID]  [Dest_EntityID]   [Quantity]

These are all integer values.  [SourceEntity]  and [DestEntity] must be present in the "tblEntities" to be allowed in the "tblTransactions" table. The number of entries in tblEntities   table may vary.

 Example transactions

StockNum  = 5000,  Src_EntityID= 100,  Dest_EntityID= 200,  Quantity = 5
StockNum  = 5000,  Src_EntityID= 300,  Dest_EntityID= 100,  Quantity = 5

As you can see,  EntityID = 100 can transfer-in or transfer-out quantities of goods.

My objective is to be able to get the current inventory of any of the [EntityID]  based on the transaction table in an efficient manner.

I've been exploring crosstab queries and see this as a contender.  I would like to be advised if a crosstab query is a correct approach.  Maybe there is a better way of doing this.

Thanks

ps..
I've included a snapshot of the crosstab query.  As I see it,  I need to read two rows of data to calculate current inventory.
Crosstab-query.JPG
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Question by:peispud
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LVL 57

Accepted Solution

by:
Jim Dettman (Microsoft MVP/ EE MVE) earned 500 total points
ID: 38714472
<<My objective is to be able to get the current inventory of any of the [EntityID]  based on the transaction table in an efficient manner.>>

 No need for a cross tab.  A simple SUM() on the qty column will do.

 As for in /out's there are a couple of approaches:

1. Always use a positive number.

2. Use a positive number with a transaction indicator, 0 for in, -1 for out.

  Transaction Qty then is always [TransactionType]*[Qty]

  This allows you to do a credit or reverse transaction.

Where these differ is in how the transaction might be formatted.  For example, someone moves 1,000 instead of 100.  

Method #1:

StockNum  = 5000,  Src_EntityID= 100,  Dest_EntityID= 200, Quantity = 1000
StockNum  = 5000,  Src_EntityID= 200,  Dest_EntityID= 100,  Quantity = 1000
StockNum  = 5000,  Src_EntityID= 100,  Dest_EntityID= 200,  Quantity = 100

Method #2:
StockNum  = 5000,  Src_EntityID= 100,  Dest_EntityID= 200,  Type = 0, Quantity = 1000
StockNum  = 5000,  Src_EntityID= 100,  Dest_EntityID= 200,  Type = -1, Quantity = 1000
StockNum  = 5000,  Src_EntityID= 100,  Dest_EntityID= 200,  Type = 0, Quantity = 100

You can't do that with Option #1.  With #1, you'd have to do:

StockNum  = 5000,  Src_EntityID= 100,  Dest_EntityID= 200,  Quantity = 1000
StockNum  = 5000,  Src_EntityID= 200,  Dest_EntityID= 100,  Quantity = 1000
StockNum  = 5000,  Src_EntityID= 100,  Dest_EntityID= 200,  Quantity = 100


I would also add a tran type field ie. Sale, Purchase Order, Mfg Process, Cycle Count, etc.

a "source" field (which program generated the transaction)  and also

EntryDate - Date transaction was entered.
TransactionDate - Date inventory was affected

Jim.
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Author Comment

by:peispud
ID: 38714647
Yes,  I do have the other fields that you mentioned.

For my question,  I am going to give the Entities short names.  Let's say that if [Transactor] can only have 0 and -1 as values.  
If transactor = -1 then  [Src_EntityID]  inventory has been reduced and [Dest_EntityID]   has increased by the same amount.   If Transasactor = 0 then visa versa.

                                            Example Table Entries

[Src_EntityID]  [Transactor]    [Dest_EntityID]       [Quantity]      <result for ABC>

    ABC                     -1                     XYZ                         100                    -100  <interim>
    QRS                     -1                     Abc                           50                     -50   <interim>
    ABC                      0                     KLM                          25                     -25    <Current>

I've been thinking about your reply..  

Would this query be at runtime in VBA?   If this is a query were to be created in runtime,  and if you are familiar with the SQL to get the result above for ABC,  then this would be greatly appreciated.
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LVL 57
ID: 38724130
Sorry, been off-line for a few days here over the holiday and just realized you had commented again.

Have you made progress with this or need more help?

Jim.
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Author Comment

by:peispud
ID: 38724435
I may have more questions again about this subject,  but feel good about it right now.

Hope you had a good holiday.
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LVL 57
ID: 38724536
<<Hope you had a good holiday. >>

 It was good, just too short<g>

<<I may have more questions again about this subject,  but feel good about it right now.>>

  OK.

Jim.
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LVL 57
ID: 38724544
By the way, you may find this old thread interesting:

Algorithm resources for Inventory DB
http://www.experts-exchange.com/Microsoft/Development/MS_Access/Q_22933888.html

and especially comment:

http://www.experts-exchange.com/Microsoft/Development/MS_Access/Q_22933888.html#a20200394

Take a look at tblTransactions.

Jim.
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