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

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Dmitri Levin

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Primary index --- is the unfortunate naming. It sounds like a Primary Key (PK), but it has nothing to do with a SQL PK as Jyothi wrote above. I believe it should have been called "First index" instead of Primary index. SQL PK is quite different -- it is a "constraint on uniqueness", supported by a unique index. But also it is a primary unique constraint. A table could have many unique constraints. And only one PK.

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