diff --git "a/13 \346\264\252\351\224\246\346\264\213/\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232.md" "b/13 \346\264\252\351\224\246\346\264\213/\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232.md" new file mode 100644 index 0000000000000000000000000000000000000000..182eb6e4488c227f3b7b16164fbbed0e3a4643fc --- /dev/null +++ "b/13 \346\264\252\351\224\246\346\264\213/\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232.md" @@ -0,0 +1,196 @@ +-- 1、创建数据库test01_market +create database test01_market; +-- 2、创建表格customers +use test01_market; +-- | 字段名 | 数据类型 | +-- | --------- | ----------- | +-- | c_num | int（11） | +-- | c_name | varchar(50) | +-- | c_contact | varchar(50) | +-- | c_city | varchar(50) | +-- | c_birth | date | +create table customers( + c_num int, + c_name varchar(50), + c_contact varchar(50), + c_city varchar(50), + c_birth date +); +-- **要求3：**将c_contact字段移动到c_birth字段后面 +alter table customers modify c_contact varchar(50) after c_birth; +desc customers; +-- **要求4：**将c_name字段数据类型改为 varchar(70) +alter table customers modify c_name varchar(70); +desc customers; +-- **要求5：**将c_contact字段改名为c_phone +alter table customers change c_contact c_phone varchar(50); +desc customers; +-- **要求6：**增加c_gender字段到c_name后面，数据类型为char(1) +alter table customers add c_gender char(1); +alter table cusromers modify column char(1) after c_name; +-- **要求7：**将表名改为customers_info +alter table custo +-- **要求8：**删除字段c_city +-- ## 第2题 +select * from books; +-- 1、创建数据库test02_library +create database test02_library; +-- 2、创建表格books +use test02_library; +select * from books; +truncate books; +-- | 字段名 | 字段说明 | 数据类型 | 允许为空 | 唯一 | +-- | ------- | -------- | ------------- | -------- | ---- | +-- | b_id | 书编号 | int(11) | 否 | 是 | +-- | b_name | 书名 | varchar（50） | 否 | 否 | +-- | authors | 作者 | varchar(100) | 否 | 否 | +-- | price | 价格 | float | 否 | 否 | +-- | pubdate | 出版日期 | year | 否 | 否 | +-- | note | 说明 | varchar(100) | 是 | 否 | +-- | num | 库存 | int(11) | 否 | 否 | +create table books( + b_id int(11), + b_name varchar(50), + authorss varchar(50), + price float, + pubdate year, + note varchar(100), + num int(11) +); +-- 3、向books表中插入记录 +-- 1） 指定所有字段名称插入第一条记录 +insert into books(b_id,b_name,authorss,price,pubdate,note,num)values(1,'Tal of AAA','Dickes',23,1995,'novel',11); +-- 2）不指定字段名称插入第二记录 +insert into books values(2,'EmmaT','Jane',35,1993,'joke',22); +-- 3）同时插入多条记录（剩下的所有记录） + +-- | b_id | b_name | authors | price | pubdate | note | num | +-- | ---- | ------------- | --------------- | ----- | ------- | -------- | ---- | +-- | 1 | Tal of AAA | Dickes | 23 | 1995 | novel | 11 | +-- | 2 | EmmaT | Jane lura | 35 | 1993 | joke | 22 | +-- | 3 | Story of Jane | Jane Tim | 40 | 2001 | novel | 0 | +-- | 4 | Lovey Day | George Byron | 20 | 2005 | novel | 30 | +-- | 5 | Old land | Honore Blade | 30 | 2010 | law | 0 | +-- | 6 | The Battle | Upton Sara | 30 | 1999 | medicine | 40 | +-- | 7 | Rose Hood | Richard haggard | 28 | 2008 | cartoon | 28 | +insert into books values(3,'Story of Jane','Jane Tim',40,2001,'novel',0); +insert into books values(5,'Lovey Day','George Byron',20,2005,'novel',30); +insert into books values(5,'Old land','Honore Blade',30,2010,'law',0), + (6,'The Battle','Upton Sara',30,1999,'medicine',40), + (7,'Rose Hood','Richard haggard',28,2008,'cartoon',28); +select * from books; + +-- 4、将小说类型(novel)的书的价格都增加5。 +update books set price=price + 5 where note='novel'; +-- 5、将名称为EmmaT的书的价格改为40。 +update books set price = 40 where b_name='EmmaT'; +-- 6、删除库存为0的记录 +delete from books where num=0; +-- ```mysql +-- +-- ``` +-- ## 第3题 +-- +-- 1、创建数据库test03_bookstore +create database tesr03_bookstore charset utf8; +use test03_bookstore; +-- 2、创建book表 +create table book( + id int(11)not null, + title varchar(100)not null, + author varchar(100)not null, + price double(11,2)not null, + sales int(11)not null, + img_path varchar(100)not null +); +-- ```mysql +-- +----------+--------------+------+-----+---------+----------------+ +-- | Field | Type | Null | Key | Default | Extra | +-- +----------+--------------+------+-----+---------+----------------+ +-- | id | int(11) | NO | PRI | NULL | auto_increment | +-- | title | varchar(100) | NO | | NULL | | +-- | author | varchar(100) | NO | | NULL | | +-- | price | double(11,2) | NO | | NULL | | +-- | sales | int(11) | NO | | NULL | | +-- | stock | int(11) | NO | | NULL | | +-- | img_path | varchar(100) | NO | | NULL | | +-- +----------+--------------+------+-----+---------+----------------+ +-- ``` +-- +-- 尝试添加部分模拟数据，参考示例如下： +-- +-- ```mysql +-- +----+-------------+------------+-------+-------+-------+----------------------------+ +-- | id | title | author | price | sales | stock | img_path | +-- +----+-------------+------------+-------+-------+-------+-----------------------------+ +insert into book values(1,'解忧杂货铺','东野圭吾',27.20,102,98,'upload/books/解忧杂货铺.jpg'), + (2,'边城','沈从文',23.00,102,98,'upload/books/边城.jpg'); + +-- | 1 | 解忧杂货店 | 东野圭吾 | 27.20 | 102 | 98 | upload/books/解忧杂货店.jpg | +-- | 2 | 边城 | 沈从文 | 23.00 | 102 | 98 | upload/books/边城.jpg | +-- +----+---------------+------------+-------+-------+-------+----------------------------+ +-- ``` + +-- 3、创建用户表users，并插入数据 + +-- ```mysql +-- +----------+--------------+------+-----+---------+----------------+ +-- | Field | Type | Null | Key | Default | Extra | +-- +----------+--------------+------+-----+---------+----------------+ +-- | id | int(11) | NO | PRI | NULL | auto_increment | +-- | username | varchar(100) | NO | UNI | NULL | | +-- | password | varchar(100) | NO | | NULL | | +-- | email | varchar(100) | YES | | NULL | | +-- +----------+--------------+------+-----+---------+----------------+ +-- ``` +-- +-- 尝试添加部分模拟数据，参考示例如下： +-- +-- ```mysql +-- +----+----------+----------------------------------+--------------------+ +-- | id | username | password | email | +-- +----+----------+----------------------------------+--------------------+ +-- | 1 | admin | 112233 | admin@mxdx.com | +-- +----+----------+----------------------------------+--------------------+ +-- ``` +-- +-- 4、创建订单表orders +create table orders(id varchar(100)not null prepare key, + order_time datetime not null, + total_amount double(11,2)not null, + state int(11)not null, + user_id int(11)not null, + key(user_id) +); +-- ```mysql +-- +--------------+--------------+------+-----+---------+-------+ +-- | Field | Type | Null | Key | Default | Extra | +-- +--------------+--------------+------+-----+---------+-------+ +-- | id | varchar(100) | NO | PRI | NULL | | +-- | order_time | datetime | NO | | NULL | | +-- | total_count | int(11) | NO | | NULL | | +-- | total_amount | double(11,2) | NO | | NULL | | +-- | state | int(11) | NO | | NULL | | +-- | user_id | int(11) | NO | MUL | NULL | | +-- +--------------+--------------+------+-----+---------+-------+ +-- ``` +-- + +-- 尝试添加部分模拟数据，参考示例如下： +-- +-- ```mysql +-- +----+-------+--------+---------+---------+-------+----------------+----------------+ +-- | id |count| amount| title | author | price | img_path | order_id | +-- +----+-------+--------+------------+----------+-------+----------------+----------------+ +-- | 1 | 1 | 27.20| 解忧杂货店 | 东野圭吾 | 27.20 | static/img/default.jpg|15294258455691 | +-- | 2 | 1 | 23.00| 边城 | 沈从文 | 23.00 | static/img/default.jpg|15294258455691 | +-- +----+-------+--------+------------+----------+-------+------------+----------------+ +-- ``` +insert into book values(1,'解忧杂货铺','东野圭吾',27.20,102,98,'upload/books/解忧杂货铺.jpg'), + (2,'边城','沈从文',23.00,102,98,'upload/books/边城.jpg'); +-- 参考答案： +-- +-- ```mysql +-- +-- ``` +-- \ No newline at end of file