# ms Access QUERY

• ### Question

• Hello everyone
I  have a question about MS ACCESS , i a,m designing a warehouse management system, and I want to calculate the balance of materials in the warehouse
But the  units  are different
For example, the user entered 2 tons of material x
And then  enters 25 kg of the same material
Then pull put  700 kg  (from x )from the warehouse
!!!
I have an Operation details Table  (
material- quantity - the unit - the unit price -..)
I have a query to calculate the balance but it does not take into account the units ,

it   calculates the balance only  by numbers !!
Any ideas ?!

Monday, May 25, 2015 8:03 AM

• You can write a simple little function which accepts the value and the unit as its arguments and returns the value as a common unit, in which you want the balance returned.  The function can then be called in a query which computes the current balance per material type on the basis of the functions return values, not the values stored in the table.  A suitable function to return a value in kilograms for instance would be along these lines:

Public Function ConvertToKg(dblQuantity As Double, strUnit As String) As Double

Dim dblFactor As Double

Select Case strUnit
Case "kg"   'kilogram
dblFactor = 1
Case "lb"   'pound
dblFactor = 0.45359237
Case "ton"  'US ton
dblFactor = 907.18474
Case "tonne"  'metric tonne
dblFactor = 1000
' and so on
End Select

ConvertToKg = dblQuantity * dblFactor

End Function

For a more flexible solution which converts from any unit to any other unit you could firstly set up a table Units and then an 'adjacency list' table which is related two instances of the Units table by having columns UnitFrom, UnitTo and Factor.  To obtain the conversion factor for any combination of units would then merely be a case of looking up the row with the appropriate UnitFrom and UnitTo values.

Ken Sheridan, Stafford, England

Tuesday, May 26, 2015 11:53 AM

### All replies

• Hi,

This is the forum to discuss questions and feedback for Microsoft Office, your issue need some Query codes, I'll move your question to the MSDN forum for Access

http://social.msdn.microsoft.com/Forums/en-US/home?forum=accessdev&filter=alltypes&sort=lastpostdesc

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Tuesday, May 26, 2015 2:01 AM
• You're going to have to give us the information of the Table, like what is the data type, ...etc.

If assuming you just input a column/field as a number, you have to properly identify the Units on the input Form of the field by limiting or control the user input correctly.

Use the Form's Textbox or a Label to indicate the Units so that the User doesn't or get confused about the Units.

2 Tons and 2 Kg is a lot of difference. You'll have to define the method of Input to the Control's event.

Tuesday, May 26, 2015 2:32 AM
• You can write a simple little function which accepts the value and the unit as its arguments and returns the value as a common unit, in which you want the balance returned.  The function can then be called in a query which computes the current balance per material type on the basis of the functions return values, not the values stored in the table.  A suitable function to return a value in kilograms for instance would be along these lines:

Public Function ConvertToKg(dblQuantity As Double, strUnit As String) As Double

Dim dblFactor As Double

Select Case strUnit
Case "kg"   'kilogram
dblFactor = 1
Case "lb"   'pound
dblFactor = 0.45359237
Case "ton"  'US ton
dblFactor = 907.18474
Case "tonne"  'metric tonne
dblFactor = 1000
' and so on
End Select

ConvertToKg = dblQuantity * dblFactor

End Function

For a more flexible solution which converts from any unit to any other unit you could firstly set up a table Units and then an 'adjacency list' table which is related two instances of the Units table by having columns UnitFrom, UnitTo and Factor.  To obtain the conversion factor for any combination of units would then merely be a case of looking up the row with the appropriate UnitFrom and UnitTo values.

Ken Sheridan, Stafford, England

Tuesday, May 26, 2015 11:53 AM