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๐Ÿ’ฌGenerate LLM translations
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github-actions[bot] authored and soyeric128 committed Oct 15, 2024
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---
title: DATE DIFF
title: DATE_DIFF
---
import FunctionDescription from '@site/src/components/FunctionDescription';

Databend ็›ฎๅ‰ๅฐšๆœชๆไพ› `date_diff` ๅ‡ฝๆ•ฐ๏ผŒไฝ†ๅฎƒๆ”ฏๆŒ็›ดๆŽฅๅฏนๆ—ฅๆœŸๅ’Œๆ—ถ้—ด่ฟ›่กŒ็ฎ—ๆœฏ่ฟ็ฎ—ใ€‚ไพ‹ๅฆ‚๏ผŒไฝ ๅฏไปฅไฝฟ็”จ่กจ่พพๅผ `TO_DATE(NOW())-2` ๆฅ่Žทๅ–ไธคๅคฉๅ‰็š„ๆ—ฅๆœŸใ€‚
<FunctionDescription description="ๅผ•ๅ…ฅๆˆ–ๆ›ดๆ–ฐ: v1.2.645"/>

Databend ็›ดๆŽฅๆ“ไฝœๆ—ฅๆœŸๅ’Œๆ—ถ้—ด็š„็ตๆดปๆ€งไฝฟๅ…ถๅœจๅค„็†ๆ—ฅๆœŸๅ’Œๆ—ถ้—ด่ฎก็ฎ—ๆ—ถๆ—ขๆ–นไพฟๅˆๅคšๅŠŸ่ƒฝใ€‚่ฏทๅ‚่งไปฅไธ‹็คบไพ‹๏ผš
ๆ นๆฎๆŒ‡ๅฎš็š„ๆ—ถ้—ดๅ•ไฝ่ฎก็ฎ—ไธคไธชๆ—ฅๆœŸๆˆ–ๆ—ถ้—ดๆˆณไน‹้—ด็š„ๅทฎๅผ‚ใ€‚ๅฆ‚ๆžœ `<end_date>` ๅœจ `<start_date>` ไน‹ๅŽ๏ผŒ็ป“ๆžœไธบๆญฃ๏ผ›ๅฆ‚ๆžœ `<end_date>` ๅœจ `<start_date>` ไน‹ๅ‰๏ผŒ็ป“ๆžœไธบ่ดŸใ€‚

## ่ฏญๆณ•

```sql
DATE_DIFF(<unit>, <start_date>, <end_date>)
```

| ๅ‚ๆ•ฐ | ๆ่ฟฐ |
|----------------|-------------------------------------------------------------------------------------------------------------|
| `<unit>` | ๅทฎๅผ‚็š„ๆ—ถ้—ดๅ•ไฝ๏ผš`YEAR`, `QUARTER`, `MONTH`, `WEEK`, `DAY`, `HOUR`, `MINUTE`, ๆˆ– `SECOND`ใ€‚ |
| `<start_date>` | ่ตทๅง‹ๆ—ฅๆœŸๆˆ–ๆ—ถ้—ดๆˆณใ€‚ |
| `<end_date>` | ็ป“ๆŸๆ—ฅๆœŸๆˆ–ๆ—ถ้—ดๆˆณใ€‚ |

## ็คบไพ‹

ๆญค็คบไพ‹่ฎก็ฎ—**ๆ˜จๅคฉ**ๅ’Œ**ไปŠๅคฉ**ไน‹้—ด็š„ๅฐๆ—ถๅทฎ๏ผš

```sql
CREATE TABLE tasks (
task_name VARCHAR(50),
start_date DATE,
end_date DATE
);

INSERT INTO tasks (task_name, start_date, end_date)
VALUES
('Task 1', '2023-06-15', '2023-06-20'),
('Task 2', '2023-06-18', '2023-06-25'),
('Task 3', '2023-06-20', '2023-06-23');

SELECT task_name, end_date - start_date AS duration
FROM tasks;

โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”
โ”‚ task_name โ”‚ duration โ”‚
โ”œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”ผโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”ค
โ”‚ Task 1 โ”‚ 5 โ”‚
โ”‚ Task 2 โ”‚ 7 โ”‚
โ”‚ Task 3 โ”‚ 3 โ”‚
โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜
SELECT DATE_DIFF(HOUR, YESTERDAY(), TODAY());

โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”
โ”‚ DATE_DIFF(HOUR, yesterday(), today()) โ”‚
โ”œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”ค
โ”‚ 24 โ”‚
โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜
```

ๆญค็คบไพ‹่ฎก็ฎ—ๅฝ“ๅ‰ๆ—ฅๆœŸไธŽ2000ๅนด1ๆœˆ1ๆ—ฅไน‹้—ด็š„ๅนดไปฝๅทฎ๏ผš

```sql
SELECT NOW(), DATE_DIFF(YEAR, NOW(), TO_DATE('2000-01-01'));

โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”
โ”‚ now() โ”‚ DATE_DIFF(YEAR, now(), to_date('2000-01-01')) โ”‚
โ”œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”ผโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”ค
โ”‚ 2024-10-15 03:38:23.726599 โ”‚ -24 โ”‚
โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜
```

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