SQL$HELP72.HLB  —  ALTER  TABLE  Arguments  referenced-column-name
    For a column constraint, the name of the column that is a
    unique key or a primary key in the referenced table. For a table
    constraint, the referenced column name is the name of the column
    or columns that are a unique key or primary key in the referenced
    table. If you omit the referenced-column-name clause, the primary
    key is selected by default.
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