From 04d762539f39e5dddda15ac80448faaa6828af97 Mon Sep 17 00:00:00 2001
From: gccgdb1234 <wxzhang@taosdata.com>
Date: Fri, 10 Jun 2022 11:18:12 +0800
Subject: [PATCH] docs: add delete data in develop branch

---
 docs-cn/07-develop/05-delete-data.mdx         | 43 +++++++++++++++++++
 ...uous-query.mdx => 06-continuous-query.mdx} |  0
 .../{06-subscribe.mdx => 07-subscribe.md}     |  0
 .../07-develop/{07-cache.md => 08-cache.md}   |  0
 docs-cn/07-develop/{08-udf.md => 09-udf.md}   |  0
 5 files changed, 43 insertions(+)
 create mode 100644 docs-cn/07-develop/05-delete-data.mdx
 rename docs-cn/07-develop/{05-continuous-query.mdx => 06-continuous-query.mdx} (100%)
 rename docs-cn/07-develop/{06-subscribe.mdx => 07-subscribe.md} (100%)
 rename docs-cn/07-develop/{07-cache.md => 08-cache.md} (100%)
 rename docs-cn/07-develop/{08-udf.md => 09-udf.md} (100%)

diff --git a/docs-cn/07-develop/05-delete-data.mdx b/docs-cn/07-develop/05-delete-data.mdx
new file mode 100644
index 0000000000..4d31da35bc
--- /dev/null
+++ b/docs-cn/07-develop/05-delete-data.mdx
@@ -0,0 +1,43 @@
+---
+sidebar_label: 删除数据
+description: "删除指定表或超级表中的数据记录"
+title: "删除数据"
+---
+
+删除数据是 TDengine 提供的根据指定时间段删除指定表或超级表中数据记录的功能，方便用户清理由于设备故障等原因产生的异常数据。
+注意：本功能只在企业版中提供，如需此功能请点击下面的链接访问[企业版产品](https://www.taosdata.com/products#enterprise-edition-link)
+
+
+**语法：**
+
+```sql
+DELETE FROM [ db_name. ] tb_name [WHERE condition];
+```
+
+**功能：** 删除指定表或超级表中的数据记录
+
+**参数：**
+   
+- db_name   可选参数，指定要删除表所在的数据库名，不填写则在当前数据库中
+- tb_name   必填参数，指定要删除数据的表名，可以是普通表、子表，也可以是超级表。
+- condition 可选参数，指定删除数据的过滤条件，不指定过滤条件则为表中所有数据，请慎重使用。特别说明，这里的where 条件中只支持对第一列时间列的过滤，如果是超级表，支持对tag列过滤。
+
+**特别说明：**
+      
+数据删除后不可恢复，请慎重使用。为了确保删除的数据确实是自己要删除的，建议可以先使用 select 语句加 where 后的删除条件查看要删除的数据内容，确认无误后再执行 delete 命令。      
+
+**示例：**
+    
+meters 是一个超级表，groupid 是 int 类型的 tag 列，现在要删除 meters 表中时间小于 2021-10-01 10:40:00.100 且 tag 列 groupid 值为 1 的所有数据，sql 如下：
+
+```sql
+delete from meters where ts < '2021-10-01 10:40:00.100' and groupid=1 ;
+```
+
+执行后显示结果为：
+
+```
+Deleted 102000 row(s) from 1020 table(s) (0.421950s)
+```
+
+表示从 1020 个子表中共删除了 102000 行数据
diff --git a/docs-cn/07-develop/05-continuous-query.mdx b/docs-cn/07-develop/06-continuous-query.mdx
similarity index 100%
rename from docs-cn/07-develop/05-continuous-query.mdx
rename to docs-cn/07-develop/06-continuous-query.mdx
diff --git a/docs-cn/07-develop/06-subscribe.mdx b/docs-cn/07-develop/07-subscribe.md
similarity index 100%
rename from docs-cn/07-develop/06-subscribe.mdx
rename to docs-cn/07-develop/07-subscribe.md
diff --git a/docs-cn/07-develop/07-cache.md b/docs-cn/07-develop/08-cache.md
similarity index 100%
rename from docs-cn/07-develop/07-cache.md
rename to docs-cn/07-develop/08-cache.md
diff --git a/docs-cn/07-develop/08-udf.md b/docs-cn/07-develop/09-udf.md
similarity index 100%
rename from docs-cn/07-develop/08-udf.md
rename to docs-cn/07-develop/09-udf.md
-- 
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