text

data/1.MySQL初阶/4.数据类型/3.文本字符串类型/config.json

 {
   "node_id": "mysql-27ff66e31d3d4118977cbbc04da6887e",
-  "keywords": [],
+  "keywords": ["text", "varchar", "char", "字符串", "文本"],
   "children": [],
-  "export": [],
+  "export": [
+    "description.json"
+  ],
   "keywords_must": [],
   "keywords_forbid": [],
   "group": 0

data/1.MySQL初阶/4.数据类型/3.文本字符串类型/description.json

+{
+  "type": "code_options",
+  "author": "Mars",
+  "source": "description.md",
+  "notebook_enable": false,
+  "exercise_id": "772f9b0947074197bbeb414fd5a094b0"
+}
\ No newline at end of file

data/1.MySQL初阶/4.数据类型/3.文本字符串类型/description.md

+# 文本字段
+
+Joe 在设计订单表，他已经完成了下列内容：
+
+```mysql
+create table orders (
+    id int primary key auto_increment,
+    item_id int,
+    amount int,
+    unit_price decimal(12, 4),
+    total_price decimal(12, 4),
+    ts timestamp default now()
+);
+```
+
+现在他需要给订单表加入一个 description 字段，这个字段需要保存订单的文字说明，这些文本不会超过两千字节， Joe 应该把建表语句修改为：
+
+## 答案
+
+```mysql
+create table orders (
+    id int primary key auto_increment,
+    item_id int,
+    amount int,
+    unit_price decimal(12, 4),
+    total_price decimal(12, 4),
+    description varchar(2000),
+    ts timestamp default now()
+);
+```
+
+## 选项
+
+### A
+
+```mysql
+create table orders (
+    id int primary key auto_increment,
+    item_id int,
+    amount int,
+    unit_price decimal(12, 4),
+    total_price decimal(12, 4),
+    description char(2000),
+    ts timestamp default now()
+);
+```
+
+### B
+
+```mysql
+create table orders (
+    id int primary key auto_increment,
+    item_id int,
+    amount int,
+    unit_price decimal(12, 4),
+    total_price decimal(12, 4),
+    description varchar(256) default '',
+    ts timestamp default now()
+);
+```
+
+### C
+
+```mysql
+create table orders (
+    id int primary key auto_increment,
+    item_id int,
+    amount int,
+    unit_price decimal(12, 4),
+    total_price decimal(12, 4),
+    description text(2000),
+    ts timestamp default now()
+);
+```
+
+### D
+
+```mysql
+create table orders (
+    id int primary key auto_increment,
+    item_id int,
+    amount int,
+    unit_price decimal(12, 4),
+    total_price decimal(12, 4),
+    description tinytext(2000),
+    ts timestamp default now()
+);
+```
\ No newline at end of file

data/1.MySQL初阶/4.数据类型/4.二进制字符串类型/binary.json

+{
+  "type": "code_options",
+  "author": "Mars",
+  "source": "binary.md",
+  "notebook_enable": false,
+  "exercise_id": "b3cdc6ba96d544969c08fe697df32dde"
+}
\ No newline at end of file

data/1.MySQL初阶/4.数据类型/4.二进制字符串类型/binary.md

+# 二进制字符串
+
+现在 Joe 的订单表已经有了如下形态：
+
+```mysql
+create table orders (
+    id int primary key auto_increment,
+    item_id int,
+    amount int,
+    unit_price decimal(12, 4),
+    total_price decimal(12, 4),
+    description varchar(2000),
+    ts timestamp default now()
+);
+```
+
+他需要添加一个字段，用来保存订单的相关图片，由于特殊的业务需要，这些图片必须保存在数据库中，图片的大小不超过100K。那么他应该将建表语句修改为：
+
+## 答案
+
+```mysql
+create table orders (
+    id int primary key auto_increment,
+    item_id int,
+    amount int,
+    unit_price decimal(12, 4),
+    total_price decimal(12, 4),
+    description varchar(2000),
+    picture blob,
+    ts timestamp default now()
+);
+```
+
+## 选项
+
+### A
+
+```mysql
+create table orders (
+    id int primary key auto_increment,
+    item_id int,
+    amount int,
+    unit_price decimal(12, 4),
+    total_price decimal(12, 4),
+    description varchar(2000),
+    picture varchar(100000),
+    ts timestamp default now()
+);
+```
+
+### B
+
+```mysql
+create table orders (
+    id int primary key auto_increment,
+    item_id int,
+    amount int,
+    unit_price decimal(12, 4),
+    total_price decimal(12, 4),
+    description varchar(2000),
+    picture text,
+    ts timestamp default now()
+);
+```
+
+### C
+
+```mysql
+create table orders (
+    id int primary key auto_increment,
+    item_id int,
+    amount int,
+    unit_price decimal(12, 4),
+    total_price decimal(12, 4),
+    description varchar(2000),
+    picture binary(100000),
+    ts timestamp default now()
+);
+```
+
+### D
+
+```mysql
+create table orders (
+    id int primary key auto_increment,
+    item_id int,
+    amount int,
+    unit_price decimal(12, 4),
+    total_price decimal(12, 4),
+    description varchar(2000),
+    picture varbinary(100000),
+    ts timestamp default now()
+);
+```

data/1.MySQL初阶/4.数据类型/4.二进制字符串类型/config.json

 {
   "node_id": "mysql-ec8f22f2c63a4f27bd12815644d0f3db",
-  "keywords": [],
+  "keywords": ["binary", "blob", "二进制"],
   "children": [],
-  "export": [],
+  "export": [
+    "binary.json"
+  ],
   "keywords_must": [],
   "keywords_forbid": [],
   "group": 0