User: 你作为专业的架构师，提供专业和准确的回答

You are given access to make searches on the Internet. The format for making a search is:
1. After the user sends a message, you will decide whether to make a search. If you choose to make a search, you will output a single message, starting with the word <web_search>, followed by ONLY your web search query. After your search query, you must output the token </web_search> to denote the end of the search query. Keep your search query very concise.
2. The system will then append the web search results at the end of the user message, starting with the token <web_search_results>. Take note that the user CANNOT SEE the content after <web_search_results> - YOU should use these results appropriately to improve your response. Additionally, If the web search results are already present in the user's message, then you MUST NOT request another web search.

IMPORTANT! You should choose to search the web ONLY if ANY of the following circumstances are met:
1. User is asking about current events or something that requires real-time information (news, sports scores, 'latest' information, etc.)
2. User is asking about some term you are unfamiliar with (e.g. if it's a little-known term, if it's a person you don't know well, etc.)
3. User is asking about anything that involves numerical facts (e.g. distances between places, population count, sizes, date and time, etc.)
4. User explicitly asks you to search or provide links to references.
If the user's query does NOT require a web search, YOU MUST NEVER run one for no reason. However, you must not refuse to search the web if the user asks you to do so.
If you are highly unsure about whether to make a search (e.g. if the user's query is vague or if you think you are unfamiliar with the query to a certain extent), you may directly ask the user for clarification.

When using web search results, you are encouraged to cite references where appropriate, using inline links in standard markdown format.
You are also allowed to make use of web search results from previous messages, if they are STRONGLY RELEVANT to the current message.

When you are not running a web search, respond completely as per normal - there is NO NEED to mention that you're not searching. 
Remember that you MUST NOT make up any false information.
Assistant: Understood. I will strictly follow these instructions in this conversation.
User: mysql datetime 范围
Assistant: 在 MySQL 中，`DATETIME` 类型用于表示日期和时间。它的范围是从 `'1000-01-01 00:00:00'` 到 `'9999-12-31 23:59:59'`。如果你希望在这个范围内进行查询或插入数据，需要确保你的日期和时间值在这个范围内。

以下是一些处理 `DATETIME` 数据的示例查询：

### 插入数据

```sql
INSERT INTO your_table (your_datetime_column) VALUES ('2023-10-01 12:00:00');
```

### 查询范围内的数据

假设我们想查询某个时间范围内的所有记录：

```sql
SELECT * FROM your_table
WHERE your_datetime_column BETWEEN '2023-01-01 00:00:00' AND '2023-12-31 23:59:59';
```

### 更新数据

更新某个时间点的数据：

```sql
UPDATE your_table 
SET your_datetime_column = '2023-05-15 10:00:00' 
WHERE your_datetime_column = '2023-05-14 09:00:00';
```

### 删除范围内的数据

删除特定日期范围内的记录：

```sql
DELETE FROM your_table 
WHERE your_datetime_column < '2023-01-01 00:00:00';
```

### 注意事项

- MySQL 的 `DATETIME` 类型不会自动转换为时区，因此在不同的环境中使用时需注意时区设置。
- 如果需要处理时区，可以考虑使用 `TIMESTAMP` 类型，它会根据时区自动转换。

以上是一些 MySQL 中 `DATETIME` 类型和相关操作的基本介绍和示例。如果有更多具体的需求或问题，请随时问我！
User: oracle date 范围
Assistant: 在 Oracle 数据库中，`DATE` 类型用于存储日期和时间信息。Oracle 的 `DATE` 类型的范围是从 `'4712-01-01 00:00:00'` 到 `'9999-12-31 23:59:59'`。

`DATE` 类型包括年、月、日、小时、分钟和秒。为了操作这些日期数据，你可以使用 SQL 查询、函数和运算符。

### 插入数据

使用 `INSERT` 语句将 `DATE` 值插入到表中：

```sql
INSERT INTO your_table (your_date_column) VALUES (TO_DATE('2023-10-01 12:00:00', 'YYYY-MM-DD HH24:MI:SS'));
```

### 查询范围内的数据

查询特定日期范围内的记录：

```sql
SELECT * FROM your_table
WHERE your_date_column BETWEEN TO_DATE('2023-01-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS') 
                          AND TO_DATE('2023-12-31 23:59:59', 'YYYY-MM-DD HH24:MI:SS');
```

### 更新数据

更新特定日期的记录：

```sql
UPDATE your_table
SET your_date_column = TO_DATE('2023-05-15 10:00:00', 'YYYY-MM-DD HH24:MI:SS')
WHERE your_date_column = TO_DATE('2023-05-14 09:00:00', 'YYYY-MM-DD HH24:MI:SS');
```

### 删除范围内的数据

删除特定日期范围内的记录：

```sql
DELETE FROM your_table
WHERE your_date_column < TO_DATE('2023-01-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS');
```

### 注意事项

- 使用 `TO_DATE` 函数将字符串转换为 `DATE` 类型时，确保日期字符串与所指定的格式匹配。
- Oracle 不会自动处理时区，如果应用程序需要时区支持，可以考虑使用 `TIMESTAMP WITH TIME ZONE` 类型。
- 在查询中，可以使用 `SYSDATE` 函数来获取当前日期和时间。

以上是 Oracle 数据库中 `DATE` 类型和相关操作的基本介绍和示例。如果您有特定的需求或问题，欢迎继续提问！
User: 结合行业数仓案例，针对datetime 默认值如何设置

<web_search_results> for "结合行业数仓案例，针对datetime 默认值如何设置":

{
  "results": []
}
Assistant: