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Access Tip: Composite Keys
By Richard Rost   Richard Rost on Twitter Richard Rost on LinkedIn Email Richard Rost   8 years ago

In this Microsoft Access video tutorial, you will learn how to create composite keys, which are table keys based on multiple fields: COMPOSITE KEYS

Access Tip Composite Keys Upload Images   Link 
Jim O 
4 years ago
Having a problem setting up a composite key for names where some of the fields are blank.
I can set it up for FirstName and LastName, but if I try to add a Middle Name (that may be blank) I can't get it to work. Read More...
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Composite Keys Upload Images   Link 
Kathy 
8 years ago
I want to be able to use two fields in combination to uniquely identify a record. For example, I want to have an Item Number and a Production Line in combination (i.e. Item Number "4060" and Production Line "Line 1" is a record; and Item Number "4060" and Production Line "Line 2" is a record. Is this possible? Read More...
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Access Tip Composite Keys Upload Images   Link 
seda bulut 
8 years ago
this site is superb. thanks fo your tips
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store calculated values Upload Images   Link 
Jerry P 
8 years ago
Composite Keys :
When or should you store calculated values in a database?


Reply from Richard Rost:

The ONLY time I recommend storing calculated values is when SPEED is an issue. If you have a complex calculation and you need to spit out long reports FAST, then it may make sense to store the calculated result, especially if it doesn't need to be recalculated frequently. Read More...
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