From 1fc109c379f488322406a20a1629aff9866a310f Mon Sep 17 00:00:00 2001
From: wangyaqi <wangyaqi988@163.com>
Date: Wed, 1 Apr 2020 16:15:09 +0800
Subject: [PATCH] Update cf-database.md

---
 docs/uniCloud/cf-database.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/docs/uniCloud/cf-database.md b/docs/uniCloud/cf-database.md
index 1f0dc2b98..6b54e450c 100644
--- a/docs/uniCloud/cf-database.md
+++ b/docs/uniCloud/cf-database.md
@@ -588,6 +588,12 @@ const dbCmd = db.command
 let res = await collection.where({
   a: dbCmd.gt(2)
 }).remove()
+
+// 清理全部数据
+const dbCmd = db.command
+let res = await collection.where({
+  _id: dbCmd.exists(true)
+}).remove()
 ```
 
 ## 更新文档
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