c、录入以下数据：

t_customer 表：

t_order 表：

t_goods 表：

t_orderdetail 表：

3、实现功能

（1）写更新语句，将 t_goods 表里的每个商品的单价增加 2 元；(注：执行你所编写 sql 语句，检查结果变化,sql 保存命名为 answer01，将更新前的数据截图保存命名为 answer01(old)，更新后的数据截图命名为 answer02(new));

UPDATE t_goods SET price=price+2;

查询更新前后的数据：

SELECT * FROM t_goods;

恢复：

UPDATE t_goods SET price=price-2;

（2）从表 t_customer 中，统计男性顾客数和女性顾客数，显示信息：性别 sex,人数 count；(注：将结果保存为视图，并将结果截图，视图和图片命名为 answer02);

CREATE VIEW answer02 AS SELECT sex 性别,COUNT(*) 人数 FROM t_customer GROUP BY sex; 

（3）统计没有卖出过的商品的信息，按库存降序，单价升序排列，显示信息为：商品名 goods_name，单价 price，库存量 stock；(注：将结果保存为视图，并将结果截图，视图和图片命名为 answer03);

CREATE VIEW answer03 AS SELECT goods_name 商品名,price 单价,stock 库存量 FROM t_goods WHERE goods_id NOT IN (SELECT goods_id FROM t_orderdtrail) ORDER BY price ASC;

（4）统计下过单的顾客的信息，显示信息为：顾客姓名 cus_name，电话 phone，性别 sex；(注：将结果保存为视图，并将结果截图，视图和图片命名为 answer04);

CREATE VIEW answer04 AS SELECT cus_name 顾客姓名,phone 电话,sex 性别 FROM t_customer  WHERE cus_id IN (SELECT cus_id FROM t_order); 

（5）写更新语句，更新 t_order 所有订单的 money 字段为订单的真实金额，订单状态改为已支付；(注：执行你所编写 sql 语句，检查结果变化,sql 保存命名为 answer05，将更新前的数据截图保存命名为 answer05(old)，更新后的数据截图命名为 answer05(new));

查询更新前后数据：

SELECT * FROM t_order;

更新前：

更新后：

UPDATE t_order t1,(SELECT order_id,(g.price*goods_count) trueMoney FROM t_orderdtrail od,t_goods g WHERE od.goods_id=g.goods_id) t2 SET t1.money=t2.trueMoney,t1.`status`=1 WHERE t1.order_id=t2.order_id; 

恢复：

UPDATE t_order SET money=0,`status`=0

（6）从表 t_customer 和 t_order，统计每个顾客（包括下过单和没下过的顾客）的下单总金额和下单总数，显示信息为：顾客姓名，电话，下单总金额 allMoney，下单总数 order_num；(注：将结果保存为视图，并将结果截图，视图和图片命名为 answer06);

CREATE VIEW answer06 AS SELECT cus_name 顾客姓名,phone 电话,SUM(price) 下单总金额,COUNT(o.order_id) 下单总数 FROM t_orderdtrail od,t_order o,t_customer c,t_goods g WHERE o.order_id=od.order_id AND o.cus_id=c.cus_id AND od.goods_id=g.goods_id GROUP BY cus_name;

（7）查询每个顾客的购物信息，显示信息：顾客姓名 cus_name，商品名 goods_name，购买次数 buy_count；(注：将结果保存为视图，并将结果截图，视图和图片命名为 answer07);

CREATE VIEW answer07 AS SELECT cus_name 顾客姓名,goods_name 商品名称, COUNT(o.order_id) 购买次数 FROM t_orderdtrail od,t_order o,t_customer c,t_goods g WHERE o.order_id=od.order_id AND o.cus_id=c.cus_id AND od.goods_id=g.goods_id  GROUP BY goods_name;

（8）为了保证删除订单时候，数据能保持一致性，对 t_order 表加触发器，在删除订单数据之后，触发删除订单明细表里的对应数据；(注：执行你所编写 sql 语句，检查结果变化，sql 保存命名为 answer08);

DROP TRIGGER IF EXISTS `answer08`; delimiter $$ CREATE TRIGGER answer08 AFTER DELETE ON t_order FOR EACH ROW BEGIN 	DELETE FROM t_orderdtrail WHERE t_orderdtrail.order_id=t_order.order_id; END $$ delimiter ;

（9）写存储过程实现查询某个顾客的登录账号，存储过程需要传入顾客姓名，并且将查到的登录账号传出，并查询展示出来；(注：执行你所编写 sql 语句，检查结果，sql 保存命名为 answer09);

delimiter $$ CREATE PROCEDURE answer09( 	IN name VARCHAR(20) ) BEGIN 	SELECT cus_name 顾客姓名,account 账号 FROM t_customer WHERE cus_name=name; END $$ delimiter ;

实现存储过程：

SET @name='王二'; CALL answer09(@name);

三、评分标准:

/* Navicat MySQL Data Transfer  Source Server         : test Source Server Version : 50646 Source Host           : localhost:3306 Source Database       : mall  Target Server Type    : MYSQL Target Server Version : 50646 File Encoding         : 65001  Date: 2021-01-15 21:37:04 */  SET FOREIGN_KEY_CHECKS=0;  -- ---------------------------- -- Table structure for t_customer -- ---------------------------- DROP TABLE IF EXISTS `t_customer`; CREATE TABLE `t_customer` (   `cus_id` int(11) NOT NULL AUTO_INCREMENT,   `cus_name` varchar(20) CHARACTER SET utf8 NOT NULL,   `phone` varchar(15) NOT NULL,   `sex` char(1) CHARACTER SET utf8 DEFAULT NULL,   `account` varchar(20) NOT NULL,   `pwd` char(8) DEFAULT NULL,   PRIMARY KEY (`cus_id`) ) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=latin1;  -- ---------------------------- -- Records of t_customer -- ---------------------------- INSERT INTO `t_customer` VALUES ('1', '张芮', '15908719999', '女', 'zhangrui', '12345678'); INSERT INTO `t_customer` VALUES ('2', '李四', '15908712222', '男', 'lisi', '12345678'); INSERT INTO `t_customer` VALUES ('3', '王二', '15908713333', '男', 'wanger', '12345678'); INSERT INTO `t_customer` VALUES ('4', '赵五', '15908714444', '男', 'zhaowu', '12345678'); INSERT INTO `t_customer` VALUES ('5', '李晓', '15908715555', '女', 'lixiao', '12345678');  -- ---------------------------- -- Table structure for t_goods -- ---------------------------- DROP TABLE IF EXISTS `t_goods`; CREATE TABLE `t_goods` (   `goods_id` int(11) NOT NULL AUTO_INCREMENT,   `goods_name` varchar(50) CHARACTER SET utf8 NOT NULL,   `price` decimal(8,2) DEFAULT NULL,   `unit` varchar(10) CHARACTER SET utf8 DEFAULT NULL,   `stock` int(11) DEFAULT '100',   PRIMARY KEY (`goods_id`) ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=latin1;  -- ---------------------------- -- Records of t_goods -- ---------------------------- INSERT INTO `t_goods` VALUES ('1', '土蜂蜜', '122.00', '公斤', '300'); INSERT INTO `t_goods` VALUES ('2', '野生干菌子', '152.00', '公斤', '50'); INSERT INTO `t_goods` VALUES ('3', '百香果', '14.50', '公斤', '100'); INSERT INTO `t_goods` VALUES ('4', '火腿肉', '99.00', '公斤', '60'); INSERT INTO `t_goods` VALUES ('5', '本地腐乳', '12.50', '瓶', '300'); INSERT INTO `t_goods` VALUES ('6', '腊肠', '147.00', '公斤', '300');  -- ---------------------------- -- Table structure for t_order -- ---------------------------- DROP TABLE IF EXISTS `t_order`; CREATE TABLE `t_order` (   `order_id` int(11) NOT NULL,   `cus_id` int(11) NOT NULL,   `number` char(6) NOT NULL,   `money` decimal(8,2) DEFAULT NULL,   `order_time` timestamp NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,   `status` char(1) CHARACTER SET utf8 DEFAULT NULL,   `remark` varchar(100) CHARACTER SET utf8 DEFAULT NULL,   PRIMARY KEY (`order_id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1;  -- ---------------------------- -- Records of t_order -- ---------------------------- INSERT INTO `t_order` VALUES ('1', '1', '000001', '0.00', '2021-01-15 21:36:56', '0', ''); INSERT INTO `t_order` VALUES ('2', '2', '000002', '0.00', '2021-01-15 21:36:56', '0', ''); INSERT INTO `t_order` VALUES ('3', '1', '000003', '0.00', '2021-01-15 21:36:56', '0', ''); INSERT INTO `t_order` VALUES ('4', '2', '000004', '0.00', '2021-01-15 21:36:56', '0', ''); INSERT INTO `t_order` VALUES ('5', '3', '000005', '0.00', '2021-01-15 21:36:56', '0', ''); INSERT INTO `t_order` VALUES ('6', '1', '000006', '0.00', '2021-01-15 21:36:56', '0', '请分装成两份'); INSERT INTO `t_order` VALUES ('7', '4', '000007', '0.00', '2021-01-15 21:36:56', '0', '请包装多加一层防护');  -- ---------------------------- -- Table structure for t_orderdtrail -- ---------------------------- DROP TABLE IF EXISTS `t_orderdtrail`; CREATE TABLE `t_orderdtrail` (   `order_id` int(11) NOT NULL,   `goods_id` int(11) NOT NULL,   `goods_count` int(11) DEFAULT '1',   `remark` varchar(100) CHARACTER SET utf8 DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1;  -- ---------------------------- -- Records of t_orderdtrail -- ---------------------------- INSERT INTO `t_orderdtrail` VALUES ('1', '2', '2', '一公斤一袋分装'); INSERT INTO `t_orderdtrail` VALUES ('2', '1', '1', ''); INSERT INTO `t_orderdtrail` VALUES ('3', '2', '2', '一公斤一袋分装'); INSERT INTO `t_orderdtrail` VALUES ('4', '5', '1', ''); INSERT INTO `t_orderdtrail` VALUES ('5', '6', '2', '一公斤一袋分装'); INSERT INTO `t_orderdtrail` VALUES ('6', '2', '3', ''); INSERT INTO `t_orderdtrail` VALUES ('7', '4', '1', '');