add drop table

data/1.MySQL初阶/3.使用数据库/2.创建和删除表/config.json

@@ -4,10 +4,15 @@
   "children": [],
   "export": [
     "create_table.json",
-    "auto_increment.json"
+    "auto_increment.json",
+    "drop_table.json"
   ],
   "keywords_must": [
-    ["mysql", "创建", "表"]
+    [
+      "mysql",
+      "创建",
+      "表"
+    ]
   ],
   "keywords_forbid": [],
   "group": 1

data/1.MySQL初阶/3.使用数据库/2.创建和删除表/drop_table.json

+{
+  "type": "code_options",
+  "author": "ccat",
+  "source": "drop_table.md",
+  "notebook_enable": false,
+  "exercise_id": "c4e2ce3e42c5454a8d6c520d4a818497"
+}
\ No newline at end of file

data/1.MySQL初阶/3.使用数据库/2.创建和删除表/drop_table.md

+# 删除表
+
+Joe 想要删除数据库中的 good_category 表，他应该怎么操作？ 
+
+<hr/>
+
+点击进入[MySQL实战练习环境](https://mydev.csdn.net/product/pod/new?image=cimg-centos7-skilltreemysql&connect=auto&create=auto&utm_source=skill){target="_blank"}。
+
+* `show databases;` 列出所有数据库
+* `show tables;` 列出所有表
+
+## 答案
+
+```mysql
+drop table goods_category;
+```
+
+## 选项
+
+### A
+
+```mysql
+delete table good_category;
+```
+
+### B
+
+```mysql
+delete table where name = 'good_category';
+```
+
+### C
+
+```mysql
+remove table good_category;
+```
+
+### D
+
+```mysql
+truncate table goods_category;
+```
+
+### E
+
+```mysql
+clean table goods_category;
+```

data/tree.json

@@ -140,7 +140,7 @@
                     }
                   },
                   {
-                    "表": {
+                    "创建和删除表": {
                       "node_id": "mysql-426b0b1e04a4462e984ee77ca536f916",
                       "keywords": [],
                       "children": [],