Check if both of two expressions are logically true.

Related Syntax Constructs

The following construct(s) refer to this construct:

• Expr

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Syntax

AndExpr

Description

An AndExpr is a logical expression that is evaluated by determining the effective boolean value (ebv) of each of its operands. The value of the AndExpr is then determined as follows:

and expression	ebv(op2) = true	ebv(op2) = false	error in ebv(op2)
ebv(op1) = true	true	false	error
ebv(op1) = false	false	false	false or error
error in ebv(op1)	error	false or error	error

Example

• Select all patients born in 1950 and living in Bradford:

  for $a in input()/patient
  where $a/born = 1950 and $a//city = "Bradford"
  return $a