11---
2- title : SETTINGS Clause
2+ title : SETTINGS ๅญๅฅ
33---
44import FunctionDescription from '@site/src /components/FunctionDescription';
55
6- <FunctionDescription description =" Introduced or updated : v1.2.652" />
6+ <FunctionDescription description =" ๅผๅ
ฅๆๆดๆฐ็ๆฌ : v1.2.652" />
77
8- SETTINGS Clause ็จไบ้
็ฝฎๅฝฑๅๅ
ถๅ้ข SQL ่ฏญๅฅๆง่ก่กไธบ็็นๅฎ่ฎพ็ฝฎใ่ฆๆฅ็ Databend ไธญๅฏ็จ็่ฎพ็ฝฎๅๅ
ถๅผ๏ผ่ฏทไฝฟ็จ [ SHOW SETTINGS] ( ../50-administration-cmds/03-show-settings.md ) ใ
8+ SETTINGS ๅญๅฅ็จไบ้
็ฝฎๅฝฑๅๅ
ถๅ็ฝฎ SQL ่ฏญๅฅๆง่ก่กไธบ็็นๅฎ่ฎพ็ฝฎใ่ฆๆฅ็ Databend ไธญๅฏ็จ็่ฎพ็ฝฎๅๅ
ถๅผ๏ผ่ฏทไฝฟ็จ [ SHOW SETTINGS] ( ../50-administration-cmds/03-show-settings.md ) ใ
99
10- ๅฆ่ฏทๅ้
๏ผ [ SET] ( ../50-administration-cmds/02-set-global.md )
10+ ๅฆ่ฏทๅ้
: [ SET] ( ../50-administration-cmds/02-set-global.md )
1111
1212## ่ฏญๆณ
1313
@@ -17,7 +17,7 @@ SETTINGS ( <setting> = <value> [, <setting> = <value>, ...] ) <statement>
1717
1818## ๆฏๆ็่ฏญๅฅ
1919
20- SETTINGS Clause ๅฏไปฅไธไปฅไธ SQL ่ฏญๅฅไธ่ตทไฝฟ็จ๏ผ
20+ SETTINGS ๅญๅฅๅฏไปฅไธไปฅไธ SQL ่ฏญๅฅไธ่ตทไฝฟ็จ:
2121
2222- [ SELECT] ( 01-query-select.md )
2323- [ INSERT] ( ../10-dml/dml-insert.md )
@@ -32,10 +32,10 @@ SETTINGS Clause ๅฏไปฅไธไปฅไธ SQL ่ฏญๅฅไธ่ตทไฝฟ็จ๏ผ
3232
3333## ็คบไพ
3434
35- ๆญค็คบไพๆผ็คบไบๅฆไฝไฝฟ็จ SETTINGS Clause ่ฐๆด SELECT ๆฅ่ฏขไธญ็ timezone ๅๆฐ ๏ผไป่ๅฝฑๅ ` now() ` ็ๆพ็คบ็ปๆ๏ผ
35+ ๆญค็คบไพๆผ็คบไบๅฆไฝไฝฟ็จ SETTINGS ๅญๅฅๅจ SELECT ๆฅ่ฏขไธญ่ฐๆดๆถๅบๅๆฐ ๏ผไป่ๅฝฑๅ ` now() ` ็ๆพ็คบ็ปๆ:
3636
3737``` sql
38- -- ๅฝๆช่ฎพ็ฝฎ timezone ๆถ ๏ผDatabend ้ป่ฎคไธบ UTC๏ผๅ ๆญค now() ่ฟๅๅฝๅ็ UTC ๆถ้ดๆณ
38+ -- ๅฝๆช่ฎพ็ฝฎๆถๅบๆถ ๏ผDatabend ้ป่ฎคไฝฟ็จ UTC๏ผๅ ๆญค now() ่ฟๅๅฝๅ UTC ๆถ้ดๆณ
3939SELECT timezone(), now();
4040
4141โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
@@ -45,7 +45,7 @@ SELECT timezone(), now();
4545โ UTC โ 2024 - 11 - 04 19 :42 :28 .424925 โ
4646โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
4747
48- -- ้่ฟๅฐ timezone ่ฎพ็ฝฎไธบ Asia/Shanghai๏ผnow() ๅฝๆฐ่ฟๅไธๆตท็ๆฌๅฐๆถ้ด ๏ผๆฏ UTC ๅฟซ 8 ๅฐๆถใ
48+ -- ้่ฟๅฐๆถๅบ่ฎพ็ฝฎไธบ Asia/Shanghai๏ผnow() ๅฝๆฐ่ฟๅไธๆตทๅฝๅฐๆถ้ด ๏ผๆฏ UTC ๆฉ 8 ๅฐๆถใ
4949SETTINGS (timezone = ' Asia/Shanghai' ) SELECT timezone(), now();
5050
5151โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
@@ -54,7 +54,7 @@ SETTINGS (timezone = 'Asia/Shanghai') SELECT timezone(), now();
5454โ Asia/ Shanghai โ 2024 - 11 - 05 03 :42 :42 .209404 โ
5555โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
5656
57- -- ๅฐ timezone ่ฎพ็ฝฎไธบ America/Toronto ไผๅฐ now() ่พๅบ่ฐๆดไธบๅคไผฆๅค็ๆฌๅฐๆถ้ด ๏ผๅๆ ไธ้จๆถๅบ๏ผ UTC-5 ๆๅคไปคๆถๆ้ด็ UTC-4๏ผ ใ
57+ -- ๅฐๆถๅบ่ฎพ็ฝฎไธบ America/Toronto ไผๅฐ now() ่พๅบ่ฐๆดไธบๅคไผฆๅคๅฝๅฐๆถ้ด ๏ผๅๆ ไธ้จๆถๅบ ( UTC-5 ๆๅคไปคๆถๆ้ด็ UTC-4) ใ
5858SETTINGS (timezone = ' America/Toronto' ) SELECT timezone(), now();
5959
6060โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
@@ -65,7 +65,51 @@ SETTINGS (timezone = 'America/Toronto') SELECT timezone(), now();
6565โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
6666```
6767
68- ๆญค็คบไพๅ
่ฎธ COPY INTO ๆไฝไฝฟ็จๆๅค 100 ไธช็บฟ็จ่ฟ่กๅนถ่กๅค็๏ผ
68+ ๆญค็คบไพๆผ็คบไบๅฆไฝไฝฟ็จ date_format_style ่ฎพ็ฝฎๅจ MySQL ๅ Oracle ๆฅๆๆ ผๅผๅๆ ทๅผไน้ดๅๆข:
69+
70+ ``` sql
71+ -- ้ป่ฎค MySQL ๆ ทๅผๆฅๆๆ ผๅผๅ
72+ SELECT to_string(' 2024-04-05' ::DATE , ' %b' );
73+
74+ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
75+ โ to_string(' 2024-04-05' , ' %b' ) โ
76+ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโค
77+ โ Apr โ
78+ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
79+
80+ -- Oracle ๆ ทๅผๆฅๆๆ ผๅผๅ
81+ SETTINGS (date_format_style = ' Oracle' ) SELECT to_string(' 2024-04-05' ::DATE , ' MON' );
82+
83+ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
84+ โ to_string(' 2024-04-05' , ' MON' ) โ
85+ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโค
86+ โ Apr โ
87+ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
88+ ```
89+
90+ ๆญค็คบไพๆพ็คบไบ week_start ่ฎพ็ฝฎๅฆไฝๅฝฑๅไธๅจ็ธๅ
ณ็ๆฅๆๅฝๆฐ:
91+
92+ ``` sql
93+ -- ้ป่ฎค week_start = 1 (ๅจไธไฝไธบไธๅจ็็ฌฌไธๅคฉ)
94+ SELECT date_trunc(WEEK, to_date(' 2024-04-03' )); -- ๅจไธ
95+
96+ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
97+ โ date_trunc(WEEK, to_date(' 2024-04-03' )) โ
98+ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโค
99+ โ 2024 - 04 - 01 โ
100+ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
101+
102+ -- ่ฎพ็ฝฎ week_start = 0 (ๅจๆฅไฝไธบไธๅจ็็ฌฌไธๅคฉ)
103+ SETTINGS (week_start = 0 ) SELECT date_trunc(WEEK, to_date(' 2024-04-03' )); -- ๅจไธ
104+
105+ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
106+ โ date_trunc(WEEK, to_date(' 2024-04-03' )) โ
107+ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโค
108+ โ 2024 - 03 - 31 โ
109+ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
110+ ```
111+
112+ ๆญค็คบไพๅ
่ฎธ COPY INTO ๆไฝไฝฟ็จๆๅค 100 ไธช็บฟ็จ่ฟ่กๅนถ่กๅค็:
69113
70114``` sql
71115SETTINGS (max_threads = 100 ) COPY INTO ...
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