PURE invariant: a (CoAgentID, target side, Type) relationship may exist only once — the DB cannot enforce uniqueness across the two nullable target columns. Returns the error when duplicateCount other identical rows already exist, else null.
duplicateCount
null
PURE invariant: a (CoAgentID, target side, Type) relationship may exist only once — the DB cannot enforce uniqueness across the two nullable target columns. Returns the error when
duplicateCountother identical rows already exist, elsenull.