fixed structure bugs

data/2.PostgreSQL中阶/2.服务端编程/4.分页查询/config.json

 {
   "node_id": "pg-69d3a1c646004e1da497fed2af57806c",
-  "keywords": ["分页", "limit", "offset"],
+  "keywords": [
+    "分页",
+    "limit",
+    "offset"
+  ],
   "children": [],
-  "export": ["paged.json"]
+  "export": [
+    "paged.json"
+  ]
 }
\ No newline at end of file

data/2.PostgreSQL中阶/2.服务端编程/4.分页查询/paged.md

@@ -15,7 +15,7 @@ create table orders
 
 现在开发人员希望查询指定的某一天内的数据，并按每一百条一页查询，那么正确的语句应该是：
 
-##  答案 
+## 答案 
 
 ```postgresql
 select id, product_id, order_date, quantity, customer_id from orders where date = $1 offset $2 limit 100;