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๐Ÿ’ฌGenerate LLM translations (#2307)
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Bohu <[email protected]>
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โ€Ždocs/cn/sql-reference/00-sql-reference/10-data-types/datetime.mdโ€Ž

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โ€Ždocs/cn/sql-reference/00-sql-reference/31-system-tables/system-settings.mdโ€Ž

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โ€Ždocs/cn/sql-reference/10-sql-commands/20-query-syntax/settings.mdโ€Ž

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---
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title: SETTINGS Clause
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title: SETTINGS ๅญๅฅ
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---
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import FunctionDescription from '@site/src/components/FunctionDescription';
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<FunctionDescription description="Introduced or updated: v1.2.652"/>
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<FunctionDescription description="ๅผ•ๅ…ฅๆˆ–ๆ›ดๆ–ฐ็‰ˆๆœฌ: v1.2.652"/>
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SETTINGS Clause ็”จไบŽ้…็ฝฎๅฝฑๅ“ๅ…ถๅ‰้ข SQL ่ฏญๅฅๆ‰ง่กŒ่กŒไธบ็š„็‰นๅฎš่ฎพ็ฝฎใ€‚่ฆๆŸฅ็œ‹ Databend ไธญๅฏ็”จ็š„่ฎพ็ฝฎๅŠๅ…ถๅ€ผ๏ผŒ่ฏทไฝฟ็”จ [SHOW SETTINGS](../50-administration-cmds/03-show-settings.md)ใ€‚
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SETTINGS ๅญๅฅ็”จไบŽ้…็ฝฎๅฝฑๅ“ๅ…ถๅ‰็ฝฎ SQL ่ฏญๅฅๆ‰ง่กŒ่กŒไธบ็š„็‰นๅฎš่ฎพ็ฝฎใ€‚่ฆๆŸฅ็œ‹ Databend ไธญๅฏ็”จ็š„่ฎพ็ฝฎๅŠๅ…ถๅ€ผ๏ผŒ่ฏทไฝฟ็”จ [SHOW SETTINGS](../50-administration-cmds/03-show-settings.md)ใ€‚
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ๅฆ่ฏทๅ‚้˜…๏ผš[SET](../50-administration-cmds/02-set-global.md)
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ๅฆ่ฏทๅ‚้˜…: [SET](../50-administration-cmds/02-set-global.md)
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## ่ฏญๆณ•
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@@ -17,7 +17,7 @@ SETTINGS ( <setting> = <value> [, <setting> = <value>, ...] ) <statement>
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## ๆ”ฏๆŒ็š„่ฏญๅฅ
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SETTINGS Clause ๅฏไปฅไธŽไปฅไธ‹ SQL ่ฏญๅฅไธ€่ตทไฝฟ็”จ๏ผš
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SETTINGS ๅญๅฅๅฏไปฅไธŽไปฅไธ‹ SQL ่ฏญๅฅไธ€่ตทไฝฟ็”จ:
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- [SELECT](01-query-select.md)
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- [INSERT](../10-dml/dml-insert.md)
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## ็คบไพ‹
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ๆญค็คบไพ‹ๆผ”็คบไบ†ๅฆ‚ไฝ•ไฝฟ็”จ SETTINGS Clause ่ฐƒๆ•ด SELECT ๆŸฅ่ฏขไธญ็š„ timezone ๅ‚ๆ•ฐ๏ผŒไปŽ่€Œๅฝฑๅ“ `now()` ็š„ๆ˜พ็คบ็ป“ๆžœ๏ผš
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ๆญค็คบไพ‹ๆผ”็คบไบ†ๅฆ‚ไฝ•ไฝฟ็”จ SETTINGS ๅญๅฅๅœจ SELECT ๆŸฅ่ฏขไธญ่ฐƒๆ•ดๆ—ถๅŒบๅ‚ๆ•ฐ๏ผŒไปŽ่€Œๅฝฑๅ“ `now()` ็š„ๆ˜พ็คบ็ป“ๆžœ:
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```sql
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-- ๅฝ“ๆœช่ฎพ็ฝฎ timezone ๆ—ถ๏ผŒDatabend ้ป˜่ฎคไธบ UTC๏ผŒๅ› ๆญค now() ่ฟ”ๅ›žๅฝ“ๅ‰็š„ UTC ๆ—ถ้—ดๆˆณ
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-- ๅฝ“ๆœช่ฎพ็ฝฎๆ—ถๅŒบๆ—ถ๏ผŒDatabend ้ป˜่ฎคไฝฟ็”จ UTC๏ผŒๅ› ๆญค now() ่ฟ”ๅ›žๅฝ“ๅ‰ UTC ๆ—ถ้—ดๆˆณ
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SELECT timezone(), now();
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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”
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โ”‚ UTC โ”‚ 2024-11-04 19:42:28.424925 โ”‚
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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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-- ้€š่ฟ‡ๅฐ† timezone ่ฎพ็ฝฎไธบ Asia/Shanghai๏ผŒnow() ๅ‡ฝๆ•ฐ่ฟ”ๅ›žไธŠๆตท็š„ๆœฌๅœฐๆ—ถ้—ด๏ผŒๆฏ” UTC ๅฟซ 8 ๅฐๆ—ถใ€‚
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-- ้€š่ฟ‡ๅฐ†ๆ—ถๅŒบ่ฎพ็ฝฎไธบ Asia/Shanghai๏ผŒnow() ๅ‡ฝๆ•ฐ่ฟ”ๅ›žไธŠๆตทๅฝ“ๅœฐๆ—ถ้—ด๏ผŒๆฏ” UTC ๆ—ฉ 8 ๅฐๆ—ถใ€‚
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SETTINGS (timezone = 'Asia/Shanghai') SELECT timezone(), now();
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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”
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โ”‚ Asia/Shanghai โ”‚ 2024-11-05 03:42:42.209404 โ”‚
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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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-- ๅฐ† timezone ่ฎพ็ฝฎไธบ America/Toronto ไผšๅฐ† now() ่พ“ๅ‡บ่ฐƒๆ•ดไธบๅคšไผฆๅคš็š„ๆœฌๅœฐๆ—ถ้—ด๏ผŒๅๆ˜ ไธœ้ƒจๆ—ถๅŒบ๏ผˆUTC-5 ๆˆ–ๅคไปคๆ—ถๆœŸ้—ด็š„ UTC-4๏ผ‰ใ€‚
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-- ๅฐ†ๆ—ถๅŒบ่ฎพ็ฝฎไธบ America/Toronto ไผšๅฐ† now() ่พ“ๅ‡บ่ฐƒๆ•ดไธบๅคšไผฆๅคšๅฝ“ๅœฐๆ—ถ้—ด๏ผŒๅๆ˜ ไธœ้ƒจๆ—ถๅŒบ (UTC-5 ๆˆ–ๅคไปคๆ—ถๆœŸ้—ด็š„ UTC-4)ใ€‚
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SETTINGS (timezone = 'America/Toronto') SELECT timezone(), now();
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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”
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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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```
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ๆญค็คบไพ‹ๅ…่ฎธ COPY INTO ๆ“ไฝœไฝฟ็”จๆœ€ๅคš 100 ไธช็บฟ็จ‹่ฟ›่กŒๅนถ่กŒๅค„็†๏ผš
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ๆญค็คบไพ‹ๆผ”็คบไบ†ๅฆ‚ไฝ•ไฝฟ็”จ date_format_style ่ฎพ็ฝฎๅœจ MySQL ๅ’Œ Oracle ๆ—ฅๆœŸๆ ผๅผๅŒ–ๆ ทๅผไน‹้—ดๅˆ‡ๆข:
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```sql
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-- ้ป˜่ฎค MySQL ๆ ทๅผๆ—ฅๆœŸๆ ผๅผๅŒ–
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SELECT to_string('2024-04-05'::DATE, '%b');
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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”
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โ”‚ to_string('2024-04-05', '%b') โ”‚
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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”ค
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โ”‚ Apr โ”‚
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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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-- Oracle ๆ ทๅผๆ—ฅๆœŸๆ ผๅผๅŒ–
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SETTINGS (date_format_style = 'Oracle') SELECT to_string('2024-04-05'::DATE, 'MON');
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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”
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โ”‚ to_string('2024-04-05', 'MON') โ”‚
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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”ค
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โ”‚ Apr โ”‚
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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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```
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ๆญค็คบไพ‹ๆ˜พ็คบไบ† week_start ่ฎพ็ฝฎๅฆ‚ไฝ•ๅฝฑๅ“ไธŽๅ‘จ็›ธๅ…ณ็š„ๆ—ฅๆœŸๅ‡ฝๆ•ฐ:
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```sql
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-- ้ป˜่ฎค week_start = 1 (ๅ‘จไธ€ไฝœไธบไธ€ๅ‘จ็š„็ฌฌไธ€ๅคฉ)
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SELECT date_trunc(WEEK, to_date('2024-04-03')); -- ๅ‘จไธ‰
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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”
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โ”‚ date_trunc(WEEK, to_date('2024-04-03')) โ”‚
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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”ค
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โ”‚ 2024-04-01 โ”‚
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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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-- ่ฎพ็ฝฎ week_start = 0 (ๅ‘จๆ—ฅไฝœไธบไธ€ๅ‘จ็š„็ฌฌไธ€ๅคฉ)
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SETTINGS (week_start = 0) SELECT date_trunc(WEEK, to_date('2024-04-03')); -- ๅ‘จไธ‰
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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”
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โ”‚ date_trunc(WEEK, to_date('2024-04-03')) โ”‚
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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”ค
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โ”‚ 2024-03-31 โ”‚
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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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```
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ๆญค็คบไพ‹ๅ…่ฎธ COPY INTO ๆ“ไฝœไฝฟ็”จๆœ€ๅคš 100 ไธช็บฟ็จ‹่ฟ›่กŒๅนถ่กŒๅค„็†:
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```sql
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SETTINGS (max_threads = 100) COPY INTO ...

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