MySQL中 and or 查询的优先级分析

select  from table where  条件1 AND 条件2 OR 条件3
等价于
select  from table where  ( 条件1 AND 条件2 )  OR 条件3

select  from table where  条件1 AND  条件2 OR 条件3 AND 条件4
等价于
select  from table where (  条件1 AND  条件2  ) OR (  条件3 AND 条件4  )

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for book
-- ----------------------------
DROP TABLE IF EXISTS `book`;
CREATE TABLE `book` (
 `id` int(10) UNSIGNED NOT NULL AUTO_INCREMENT,
 `name` varchar(25) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL,
 `author` varchar(25) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL,
 `price` decimal(10, 2) DEFAULT NULL,
 PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of book
-- ----------------------------
INSERT INTO `book` VALUES (1, 'PHP', 'mate', 21.00);
INSERT INTO `book` VALUES (2, 'JAVA', 'kaven', 23.00);
INSERT INTO `book` VALUES (3, 'JAVA高级', 'loose', 45.00);
INSERT INTO `book` VALUES (4, 'GO', 'jim', 46.00);
INSERT INTO `book` VALUES (5, 'GO设计', 'json', 76.00);
INSERT INTO `book` VALUES (6, 'PHP高级编程', 'bate', 67.00);
INSERT INTO `book` VALUES (7, 'Python', 'jim', 66.00);
INSERT INTO `book` VALUES (8, 'Python设计', 'mali', 54.00);
INSERT INTO `book` VALUES (9, 'GO编程', 'kaven', 86.00);
INSERT INTO `book` VALUES (11, 'Python3', 'jim', 55.00);

SET FOREIGN_KEY_CHECKS = 1;

SELECT  FROM book WHERE author='jim' OR author='json' AND name='PHP';

SELECT  FROM book WHERE author='jim' OR (author='json' AND name='PHP');

SELECT  FROM book WHERE name='PHP' AND author='jim' OR author='json';

SELECT  FROM book WHERE (name='PHP' AND author='jim') OR author='json';

SELECT  FROM book WHERE name='GO' AND (author='jim' OR author='json');