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I am converting some ADO code to SDAC and have run into

QData.Properties['Update Criteria'].Value := adCriteriaKey;

What is the TMSQuery equivalent?

TMSQuery does not need such property. If a table has an IDENTITY field, TMSQuery uses it for updating. If a table does not have an IDENTITY field but has Primary Key, TMSQuery uses Primary Key fields for updating. If a table does not have an IDENTITY field and Primary Key, TMSQuery uses all fields for updating.