seph12/13/2019, 10:14 PM
theopolis12/13/2019, 10:16 PM
required=A query must include this column.
index=The set of all index columns defines a unique row and other code may make optimizations given this assumption.
additional=Table implementation code takes explicit action on this data if present.And I felt like you were focusing on the specific actions such as a primary key being defined.