Expressions›

querySource

The data source for a query. May be a retrieve expression, a qualified identifier referencing a previously defined expression, or a parenthesized expression. Forms the basis of an aliased query source.

Examples

Retrieve as source

from [Encounter: "Inpatient Encounter"] E

Named expression as source

from "Active Conditions" C

Parenthesized expression as source

from (["Encounter"] union ["Encounter, Performed"]) E
Railroad Diagram
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retrieve qualifiedIdentifierExpression ( expression )

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EBNF

querySource
  : retrieve
  | qualifiedIdentifierExpression
  | '(' expression ')'
  ;

Used In

aliasedQuerySource