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docs/cn/sql-reference/20-sql-functions/05-datetime-functions/date-diff.md
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--- | ||
title: DATE DIFF | ||
title: DATE_DIFF | ||
--- | ||
import FunctionDescription from '@site/src/components/FunctionDescription'; | ||
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Databend ็ฎๅๅฐๆชๆไพ `date_diff` ๅฝๆฐ๏ผไฝๅฎๆฏๆ็ดๆฅๅฏนๆฅๆๅๆถ้ด่ฟ่ก็ฎๆฏ่ฟ็ฎใไพๅฆ๏ผไฝ ๅฏไปฅไฝฟ็จ่กจ่พพๅผ `TO_DATE(NOW())-2` ๆฅ่ทๅไธคๅคฉๅ็ๆฅๆใ | ||
<FunctionDescription description="ๅผๅ ฅๆๆดๆฐ: v1.2.645"/> | ||
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Databend ็ดๆฅๆไฝๆฅๆๅๆถ้ด็็ตๆดปๆงไฝฟๅ ถๅจๅค็ๆฅๆๅๆถ้ด่ฎก็ฎๆถๆขๆนไพฟๅๅคๅ่ฝใ่ฏทๅ่งไปฅไธ็คบไพ๏ผ | ||
ๆ นๆฎๆๅฎ็ๆถ้ดๅไฝ่ฎก็ฎไธคไธชๆฅๆๆๆถ้ดๆณไน้ด็ๅทฎๅผใๅฆๆ `<end_date>` ๅจ `<start_date>` ไนๅ๏ผ็ปๆไธบๆญฃ๏ผๅฆๆ `<end_date>` ๅจ `<start_date>` ไนๅ๏ผ็ปๆไธบ่ดใ | ||
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## ่ฏญๆณ | ||
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```sql | ||
DATE_DIFF(<unit>, <start_date>, <end_date>) | ||
``` | ||
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| ๅๆฐ | ๆ่ฟฐ | | ||
|----------------|-------------------------------------------------------------------------------------------------------------| | ||
| `<unit>` | ๅทฎๅผ็ๆถ้ดๅไฝ๏ผ`YEAR`, `QUARTER`, `MONTH`, `WEEK`, `DAY`, `HOUR`, `MINUTE`, ๆ `SECOND`ใ | | ||
| `<start_date>` | ่ตทๅงๆฅๆๆๆถ้ดๆณใ | | ||
| `<end_date>` | ็ปๆๆฅๆๆๆถ้ดๆณใ | | ||
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## ็คบไพ | ||
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ๆญค็คบไพ่ฎก็ฎ**ๆจๅคฉ**ๅ**ไปๅคฉ**ไน้ด็ๅฐๆถๅทฎ๏ผ | ||
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```sql | ||
CREATE TABLE tasks ( | ||
task_name VARCHAR(50), | ||
start_date DATE, | ||
end_date DATE | ||
); | ||
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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'); | ||
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SELECT task_name, end_date - start_date AS duration | ||
FROM tasks; | ||
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โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ | ||
โ task_name โ duration โ | ||
โโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโค | ||
โ Task 1 โ 5 โ | ||
โ Task 2 โ 7 โ | ||
โ Task 3 โ 3 โ | ||
โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ | ||
SELECT DATE_DIFF(HOUR, YESTERDAY(), TODAY()); | ||
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โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ | ||
โ DATE_DIFF(HOUR, yesterday(), today()) โ | ||
โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโค | ||
โ 24 โ | ||
โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ | ||
``` | ||
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ๆญค็คบไพ่ฎก็ฎๅฝๅๆฅๆไธ2000ๅนด1ๆ1ๆฅไน้ด็ๅนดไปฝๅทฎ๏ผ | ||
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```sql | ||
SELECT NOW(), DATE_DIFF(YEAR, NOW(), TO_DATE('2000-01-01')); | ||
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โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ | ||
โ now() โ DATE_DIFF(YEAR, now(), to_date('2000-01-01')) โ | ||
โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโค | ||
โ 2024-10-15 03:38:23.726599 โ -24 โ | ||
โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ | ||
``` |