[Progress Communities] [Progress OpenEdge ABL] Forum Post: RE: How to add a FOREIGN KEY to an existing table?

  • Thread starter Thread starter Jyothi Sundaragiri
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Jyothi Sundaragiri

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The 4GL requires a primary index for every table. This primary index doesn't have to be unique. The Progress Sql Primary Key constraint is something you tag per column and is optional. A Sql Primary Key constraint is a "constraint on uniqueness", but isn't equal to an index.

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