Basic predicates

A basic predicate compares two values.

Basic predicates can be of two forms, for example:

expression-1  comparison-operator  expression-2

expression-3  comparison-operator ( subselect )

The subselect must not return more than one value and the subselect cannot return a type of an Enterprise JavaBeans (EJB) reference. Boolean types and reference types only support = and <> comparisons.

Example: Basic predicates

d.name='Java Development'
e.salary > 20000
e.salary > ( select avg(e.salary) from EmpBean e)

指出主題類型的圖示 概念主題



時間戳記圖示 前次更新: July 9, 2016 11:11
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