This is what happens I'm afraid when you play fast and loose with the relational model, whereas if you stick to a properly normalized structure along the lines I suggested the data becomes self-protecting by virtue of the constraints inherent in the logical model. How satisfied are you with this reply? Thanks for your feedback, it helps us improve the site.
In reply to JoBush's post on March 31, Jo: I assume that the numbers are distinct within each alphabetic element, i. If so then I'd suggest: 1.
Have two columns PatternNumber and PatternCode, the latter being for the alphabetic element. Create a unique index on these two columns. In pre versions this is done in table design view by selecting Indexes from the View menu; in Indexes on the Design ribbon. In the dialogue which opens enter a suitable name for the index in the first empty row of the Index name column, PatternIndex say.
In the Field Name column of the same row enter PatternNumber, and with this row still selected, in the Index Properties below, select 'Yes' as the Unique property. Don't enter anything in the Index name column for this row. Close the dialogue and save the table design. This will be fine in a single-user environment, but there could be conflicts in a multi-user environment of two or more users are simultaneously adding a new pattern of the same code.
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