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The logical operators take logical operands and produce logical results, meaning “true or false.” Logical operators are not true Boolean operators because they may also result in a system-missing value. See Boolean Values, for more information.

`a`AND`b``a`&`b`True if both

`a`and`b`are true, false otherwise. If one operand is false, the result is false even if the other is missing. If both operands are missing, the result is missing.`a`OR`b``a`|`b`True if at least one of

`a`and`b`is true. If one operand is true, the result is true even if the other operand is missing. If both operands are missing, the result is missing.`NOT`

`a``~`

`a`True if

`a`is false. If the operand is missing, then the result is missing.