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1、创建表：

DROP TABLE IF EXISTS `client`;
CREATE TABLE `client`  (
  `id` int NOT NULL AUTO_INCREMENT,
  `client_ids` json NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of client
-- ----------------------------
INSERT INTO `client` VALUES (1, '[\"a\", \"b\"]');
INSERT INTO `client` VALUES (2, '[\"a\", \"ab\"]');

2、查询json数组中含有"b"元素的记录：("ab" 不算 "b")

select * from client t where JSON_CONTAINS(t.client_ids, JSON_ARRAY('b'), '$');

执行结果：