<<Interface>> ValueExpression {Analysis}

Documentation
4.14.5 Base columns and generated columns

A column of a base table is either a base column or a generated column. A base column is one that is not a generated column.

A generated column is one whose values are determined by evaluation of a generation expression, a <value expression> whose declared type is by implication that of the column.

A generation expression can reference base columns of the base table to which it belongs but cannot otherwise access SQLdata. Thus, the value of the field corresponding to a generated column in row R is determined by the values of zero or more other fields of R.


Parent PackageExpressionsAbstractNo
Export ControlPublicAccessLink Class forNone
Class KindNormalClassCardinalityn
Space ConcurrencySequential
PersistenceNo  


Operations
NameSignatureClass
getSQLString getSQL ()ValueExpression
setSQLvoid setSQL (String sqlText)ValueExpression


Associations
NameMy RoleMy ClassOther RoleOther Element
--Not Named--generateExpressionValueExpression--Not Named--Column