diff --git "a/data/3.OceanBase\351\253\230\351\230\266/3.\347\274\226\347\250\213\345\222\214\346\237\245\350\257\242/2.\350\277\236\346\216\245\346\237\245\350\257\242/show_title.json" "b/data/3.OceanBase\351\253\230\351\230\266/3.\347\274\226\347\250\213\345\222\214\346\237\245\350\257\242/2.\350\277\236\346\216\245\346\237\245\350\257\242/show_title.json"
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index 0000000000000000000000000000000000000000..a59f68580a5ff64506cafe8657809b261f906450
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@@ -0,0 +1,5 @@
+{
+  "type": "code_options",
+  "author": "刘鑫",
+  "source": "show_title.md"
+}
\ No newline at end of file
diff --git "a/data/3.OceanBase\351\253\230\351\230\266/3.\347\274\226\347\250\213\345\222\214\346\237\245\350\257\242/2.\350\277\236\346\216\245\346\237\245\350\257\242/show_title.md" "b/data/3.OceanBase\351\253\230\351\230\266/3.\347\274\226\347\250\213\345\222\214\346\237\245\350\257\242/2.\350\277\236\346\216\245\346\237\245\350\257\242/show_title.md"
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+# 显示分类标题
+
+假设员工表employee和部门表department中有如下列：
+
+```sql
+create table employee(
+    id integer auto_increment primary key ,
+    name varchar(256),
+    dept int
+);
+
+create table department(
+    id integer auto_increment primary key ,
+    name varchar(256)
+)
+```
+
+员工表的 dept 列引用 department 表的主键。
+
+那么能够显示员工列表，并展示其所在部门的名称的是：
+
+## 答案
+
+```sql
+select e.id, e.name, d.name as department 
+from employee as e join department as d on e.dept = d.id
+```
+
+## 选项
+
+### 表名引用错误
+
+```sql
+select e.id, e.name, d.name as department 
+from employee as e join department as d on e.dept = d.id
+```
+
+### 连接条件错误
+
+```sql
+select e.id, e.name, e.name as department 
+from employee as e join department as d on e.id = d.id
+```
+
+### 连接条件错误
+
+```sql
+select e.id, e.name, e.name as department 
+from employee as e join department as d on e.department in d.id
+```
+
+
+### 列名存在歧义问题
+
+```sql
+select e.id, name, d.name as department 
+from employee as e join department as d on e.dept = d.id
+```