add window function excerise

data/1.PostgreSQL初阶/3.查询数据/4.常见数据类型/config.json

+{
+  "node_id": "pg-3c400d541e81472e842be3355978c33a",
+  "keywords": [
+    "datetime",
+    "text",
+    "varchar",
+    "int",
+    "double",
+    "float",
+    "decimal",
+    "timestamp"
+  ],
+  "children": [],
+  "export": [
+    "datetime.json",
+    "numbers.json",
+    "description.json"
+  ],
+  "keywords_must": [],
+  "keywords_forbid": []
+}
\ No newline at end of file

data/1.PostgreSQL初阶/3.查询数据/4.常见数据类型/numbers.json

+{
+  "type": "code_options",
+  "author": "ccat",
+  "source": "numbers.md",
+  "notebook_enable": false,
+  "exercise_id": "843d03b9116946feb2260c9636bedd4a"
+}
\ No newline at end of file