Create settings.md

Author: soyeric128

docs/en/sql-reference/10-sql-commands/20-query-syntax/settings.md

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+---
+title: SETTINGS
+---
+import FunctionDescription from '@site/src/components/FunctionDescription';
+
+<FunctionDescription description="Introduced or updated: v1.2.652"/>
+
+The SETTINGS clause configures specific settings that influence the execution behavior of the SQL statement it precedes. To view the available settings in Databend and their values, use [SHOW SETTINGS](../50-administration-cmds/03-show-settings.md).
+
+## Syntax
+
+```sql
+SETTINGS ( <setting> = <value> [, <setting> = <value>, ...] ) <statement>
+```
+
+## Supported Statements
+
+The SETTINGS clause can be used with the following SQL statements:
+
+- [SELECT](01-query-select.md)
+- [INSERT](../10-dml/dml-insert.md)
+- [INSERT (multi-table)](../10-dml/dml-insert-multi.md)
+- [MERGE](../10-dml/dml-merge.md)
+- [`COPY INTO <table>`](../10-dml/dml-copy-into-table.md)
+- [`COPY INTO <location>`](../10-dml/dml-copy-into-location.md)
+- [UPDATE](../10-dml/dml-update.md)
+- [DELETE](../10-dml/dml-delete-from.md)
+- [CREATE TABLE](../00-ddl/01-table/10-ddl-create-table.md)
+- [EXPLAIN](../40-explain-cmds/explain.md)
+
+## Examples
+
+This example demonstrates how the SETTINGS clause can be used to adjust the timezone parameter in a SELECT query, impacting the displayed result of `now()`:
+
+```sql
+-- When no timezone is set, Databend defaults to UTC, so now() returns the current UTC timestamp
+SELECT timezone(), now();
+
+┌─────────────────────────────────────────┐
+│ timezone() │            now()           │
+│   String   │          Timestamp         │
+├────────────┼────────────────────────────┤
+│ UTC        │ 2024-11-04 19:42:28.424925 │
+└─────────────────────────────────────────┘
+
+-- By setting the timezone to Asia/Shanghai, the now() function returns the local time in Shanghai, which is 8 hours ahead of UTC.
+SETTINGS (timezone = 'Asia/Shanghai') SELECT timezone(), now();
+
+┌────────────────────────────────────────────┐
+│   timezone()  │            now()           │
+├───────────────┼────────────────────────────┤
+│ Asia/Shanghai │ 2024-11-05 03:42:42.209404 │
+└────────────────────────────────────────────┘
+
+--  Setting the timezone to America/Toronto adjusts the now() output to the local time in Toronto, reflecting the Eastern Time Zone (UTC-5 or UTC-4 during daylight saving time).
+SETTINGS (timezone = 'America/Toronto') SELECT timezone(), now();
+
+┌──────────────────────────────────────────────┐
+│    timezone()   │            now()           │
+│      String     │          Timestamp         │
+├─────────────────┼────────────────────────────┤
+│ America/Toronto │ 2024-11-04 14:42:48.353577 │
+└──────────────────────────────────────────────┘
+```
+
+This example allows the COPY INTO operation to utilize up to 100 threads for parallel processing:
+
+```sql
+SETTINGS (max_threads = 100) COPY INTO ...
+```