可以模糊查询函数的文档说明。
sql
C:\d>duckdb0711
DuckDB v1.6.0-dev10607 (Development Version, dfd8755084)
Enter ".help" for usage hints.
memory D .manual delete
No function matches 'delete'
Did you mean:
degrees
element_at
memory D .manual degrees
────────────────────────────────────────────────────────────────────────────────────────────────
system.main degrees scalar function
SIGNATURE
degrees(x DOUBLE) -> DOUBLE
DESCRIPTION
Converts radians to degrees
EXAMPLES
degrees(pi())
memory D .manual colc
No function matches 'colc'
Did you mean:
col_description
concat
cos
cot
memory D .manual concat
────────────────────────────────────────────────────────────────────────────────────────────────
system.main concat scalar function
SIGNATURE
concat(value ANY, ANY...) -> ANY
DESCRIPTION
Concatenates multiple strings or lists. `NULL` inputs are skipped. See also operator `||`.
EXAMPLES
concat('Hello', ' ', 'World')
concat([1, 2, 3], NULL, [4, 5, 6])
memory D .help delete
Nothing matches 'delete'
memory D .help concat
Nothing matches 'concat'但是不能对sql关键字查找信息。
用.help时，无法给出相应函数文档。
sqlite的rust改写tursodb也有.manual命令，但不是针对函数和命令，而是概念。
root@DESKTOP-59T6U68:/mnt/c/d# ./tursodb061
Turso v0.6.1
Enter ".help" for usage hints.
Did you know that Turso supports a built-in MCP server? Type .manual mcp to learn more.
This software is in BETA, use caution with production data and ensure you have backups.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database
turso> .manual delete
Manual page not found: delete
turso> .manual colc
Manual page not found: colc
turso> .manual concat
Manual page not found: concat
turso> .manual materialized-views
▐
Live Materialized Views ▐
▐
Live materialized views in Turso are automatically updating database objects that maintain query results in real-time. Unlike traditional materialized views that require ▐
manual refresh, Turso's live materialized views use Incremental View Maintenance (IVM) to stay current with minimal overhead. ▐
▐
Enabling Materialized Views ▐
▐
Materialized views are an experimental feature that must be explicitly enabled: ▐
▐
tursodb --experimental-views your_database.db ▐
▐
What Makes Them Special ▐
▐
Traditional materialized views store a snapshot of query results that becomes stale as the underlying data changes. You must manually refresh them, which often means ▐
re-executing the entire query. That is a costly operation for large datasets. ▐
▐
Turso's materialized views are different. They automatically update themselves by tracking only the changes to the underlying tables. When you insert, update, or delete a ▐
row, the materialized view calculates just the incremental changes needed to stay current. This means: ▐
▐
- No manual refresh required - Views are always up-to-date ▐
- Efficient updates - Only processes changed data, not the entire dataset ▐
- Real-time consistency - Changes are reflected immediately ▐
- Scalable performance - Update cost is proportional to the size of changes, not the size of the table ▐
▐
How Incremental View Maintenance Works ▐
▐
Instead of re-computing the entire view when data changes, IVM tracks what has changed and updates only the affected portions of the materialized view. For example: ▐
▐
- When you insert a new row, IVM adds only that row's contribution to the view ▐
- When you delete a row, IVM removes only that row's contribution ▐
- When you update a row, IVM treats it as a delete of the old value followed by an insert of the new value ▐
▐
This approach is particularly powerful for aggregations. If you have a view that calculates the sum of millions of rows, adding one new row only requires adding that single ▐
value to the existing sum---not re-summing all million rows. ▐
▐
Transactional Consistency ▐
▐
Because live materialized views are instantly updated, they are fully transactional. Views are updated inside the same transaction as the base table modifications, ensuring:▐
▐
- Atomic updates - View changes are committed or rolled back together with base table changes