sql-statements:add drop-stats.md

TOC.md

@@ -266,6 +266,7 @@
       - [`DROP DATABASE`](/sql-statements/sql-statement-drop-database.md)
       - [`DROP INDEX`](/sql-statements/sql-statement-drop-index.md)
       - [`DROP SEQUENCE`](/sql-statements/sql-statement-drop-sequence.md)
+      - [`DROP STATS`](/sql-statements/sql-statement-drop-stats.md)
       - [`DROP TABLE`](/sql-statements/sql-statement-drop-table.md)
       - [`DROP USER`](/sql-statements/sql-statement-drop-user.md)
       - [`DROP VIEW`](/sql-statements/sql-statement-drop-view.md)

sql-statements/sql-statement-drop-stats.md

@@ -0,0 +1,70 @@
+---
+title: DROP STATS
+summary: TiDB 数据库中 DROP STATS 的使用概况。
+category: reference
+---
+
+# DROP STATS
+
+`DROP STATS` 语句用于从当前所选定的数据库中删除选定表的统计信息。
+
+## 语法图
+
+**DropStatsStmt:**
+
+![DropTableStmt](/media/sqlgram/DropStatsStmt.png)
+
+**TableName:**
+
+![TableName](/media/sqlgram/TableName.png)
+
+## 示例
+
+{{< copyable "sql" >}}
+
+```sql
+CREATE TABLE t(a INT);
+```
+
+```sql
+Query OK, 0 rows affected (0.01 sec)
+```
+
+{{< copyable "sql" >}}
+
+```sql
+SHOW STATS_META WHERE db_name='test' and table_name='t';
+```
+
+```sql
++---------+------------+----------------+---------------------+--------------+-----------+
+| Db_name | Table_name | Partition_name | Update_time         | Modify_count | Row_count |
++---------+------------+----------------+---------------------+--------------+-----------+
+| test    | t          |                | 2020-05-25 20:34:33 |            0 |         0 |
++---------+------------+----------------+---------------------+--------------+-----------+
+1 row in set (0.00 sec)
+```
+
+{{< copyable "sql" >}}
+
+```sql
+DROP STATS t;
+```
+
+```sql
+Query OK, 0 rows affected (0.00 sec)
+```
+
+{{< copyable "sql" >}}
+
+```sql
+SHOW STATS_META WHERE db_name='test' and table_name='t';
+```
+
+```sql
+Empty set (0.00 sec)
+```
+
+## 另请参阅
+
+* [统计信息简介](/statistics.md)

statistics.md

@@ -345,3 +345,7 @@ LOAD STATS 'file_name';
 ```
 
 `file_name` 为要导入的统计信息的文件名。
+
+## 另请参阅
+
+* [DROP STATS](/sql-statements/sql-statement-drop-stats.md)