출처 : https://help.sap.com/docs/SAP_ASE/993b1744f83f452e94b5c4168e8774d8/aa226f28bc2b10148bbada492ba000f8.html?version=16.0.0.0
Logical Operator Precedence When more than one logical operator is used in a statement, not is evaluated first, then and, and finally or.
조건문에서 괄호 없이 AND와 OR가 같이 쓰인 경우, AND가 먼저 수행된다.