updates

Author: soyeric128

docs/en/sql-reference/00-sql-reference/10-data-types/interval.md

@@ -8,30 +8,45 @@ import FunctionDescription from '@site/src/components/FunctionDescription';
 
 The INTERVAL data type represents a duration of time, allowing precise manipulation and storage of time intervals across various units.
 
-- Supports units including `Millennium`, `Century`, `Decade`, `Year`, `Quarter`, `Month`, `Week`, `Day`, `Hour`, `Minute`, `Second`, `Millisecond`, and `Microsecond`.
 - Accepts natural language formats (e.g., '1 year 2 months ago') or numeric values interpreted as microseconds.
+
+    - Supports time units including `Millennium`, `Century`, `Decade`, `Year`, `Quarter`, `Month`, `Week`, `Day`, `Hour`, `Minute`, `Second`, `Millisecond`, and `Microsecond`.
+
+    ```sql title='Examples:'
+    -- Create a table with one INTERVAL column
+    CREATE OR REPLACE TABLE intervals (duration INTERVAL);
+
+    -- Insert different types of INTERVAL data
+    INSERT INTO intervals VALUES 
+        ('1 year 2 months ago'),     -- Natural language format with 'ago' (negative interval)
+        ('1 year 2 months'),         -- Natural language format without 'ago' (positive interval)
+        ('1000000'),                 -- Positive numeric value interpreted as microseconds
+        ('-1000000');                -- Negative numeric value interpreted as microseconds
+
+    -- Query the table to see the results
+    SELECT * FROM intervals;
+
+    ┌──────────────────────────┐
+    │         duration         │
+    ├──────────────────────────┤
+    │ -1 year -2 months        │
+    │ 1 year 2 months          │
+    │ 0:00:01                  │
+    │ -1 month -1 day -0:00:01 │
+    └──────────────────────────┘
+    ```
+
+    - When given a numeric value, Databend only recognizes the integer part of the value. For example, both `TO_INTERVAL('1 seconds')` and `TO_INTERVAL('1.6 seconds')` represent an interval of 1 second. The fractional part after the decimal point is ignored.
+
+    ```sql title='Examples:'
+    SELECT TO_INTERVAL('1 seconds'), TO_INTERVAL('1.6 seconds');
+
+    ┌───────────────────────────────────────────────────────┐
+    │ to_interval('1 seconds') │ to_interval('1.6 seconds') │
+    ├──────────────────────────┼────────────────────────────┤
+    │ 0:00:01                  │ 0:00:01                    │
+    └───────────────────────────────────────────────────────┘
+    ```
 - Handles both positive and negative intervals with precision down to microseconds.
 - INTERVAL columns are *not* supported in the ORDER BY clause.
-- It is *not* recommended to use the MySQL client to query INTERVAL columns in Databend, as the MySQL protocol does not fully support the INTERVAL type. This may result in errors or unexpected behavior.
-
-```sql title='Examples:'
--- Create a table with one INTERVAL column
-CREATE OR REPLACE TABLE intervals (duration INTERVAL);
-
--- Insert different types of INTERVAL data
-INSERT INTO intervals VALUES 
-    ('1 year 2 months ago'),     -- Natural language format with 'ago' (negative interval)
-    ('1 year 2 months'),         -- Natural language format without 'ago' (positive interval)
-    ('1000000'),                 -- Positive numeric value interpreted as microseconds
-    ('-1000000');                -- Negative numeric value interpreted as microseconds
-
--- Query the table to see the results
-SELECT * FROM intervals;
-
-duration                |
-------------------------+
--1 year -2 months       |
-1 year 2 months         |
-0:00:01                 |
--1 month -1 day -0:00:01|
-```
+- It is *not* recommended to use the MySQL client to query INTERVAL columns in Databend, as the MySQL protocol does not fully support the INTERVAL type. This may result in errors or unexpected behavior.

docs/en/sql-reference/10-sql-commands/00-ddl/00-database/undrop-database.md

@@ -12,7 +12,26 @@ See also: [DROP DATABASE](ddl-drop-database.md)
 UNDROP DATABASE <database_name>
 ```
 
-If a database with the same name already exists, an error is returned.
+- If a database with the same name already exists, an error is returned.
+
+    ```sql title='Examples:'
+    root@localhost:8000/default> CREATE DATABASE doc;
+    processed in (0.030 sec)
+
+    root@localhost:8000/default> DROP DATABASE doc;
+    processed in (0.028 sec)
+
+    root@localhost:8000/default> CREATE DATABASE doc;
+    processed in (0.028 sec)
+
+    root@localhost:8000/default> UNDROP DATABASE doc;
+    error: APIError: QueryFailed: [2301]Database 'doc' already exists
+    ```
+- Undropping a database does not automatically restore ownership to the original role. After undropping, ownership must be manually granted to the previous role or another role. Until then, the database will be accessible only to the `account-admin` role.
+
+    ```sql title='Examples:'
+    GRNAT OWNERSHIP on doc.* to ROLE writer;
+    ```
 
 ## Examples
 

docs/en/sql-reference/10-sql-commands/00-ddl/01-table/21-ddl-undrop-table.md

@@ -16,7 +16,27 @@ Restores the recent version of a dropped table. This leverages the Databend Time
 UNDROP TABLE [ <database_name>. ]<table_name>
 ```
 
-If a table with the same name already exists, an error is returned.
+- If a table with the same name already exists, an error is returned.
+
+    ```sql title='Examples:'
+    root@localhost:8000/default> CREATE TABLE t(id INT);
+    processed in (0.036 sec)
+
+    root@localhost:8000/default> DROP TABLE t;
+    processed in (0.033 sec)
+
+    root@localhost:8000/default> CREATE TABLE t(id INT, name STRING);
+    processed in (0.030 sec)
+
+    root@localhost:8000/default> UNDROP TABLE t;
+    error: APIError: QueryFailed: [2308]Undrop Table 't' already exists
+    ```
+
+- Undropping a table does not automatically restore ownership to the original role. After undropping, ownership must be manually granted to the previous role or another role. Until then, the table will be accessible only to the `account-admin` role.
+
+    ```sql title='Examples:'
+    GRNAT OWNERSHIP on doc.t to ROLE writer;
+    ```
 
 ## Examples