Functions,Table functions,Sequence,Type这些都是属于一个schema级别的资源,对应通过CREATE MACRO/FUNCTION,CREATE MACRO...AS TABLE,CREATE SEQUENCE,CREATE TYPE语句创建的资源,这些资源的元信息通table,index,view一样持久化到.db文件中的。 之后会找时间整理一下DuckDB 列存的实现,ART index的实现,事务的实现,结合着MySQL实现作对比,应该会很有意思
remove_function("ols4") duckdb.create_function("ols4", ols4) 这样我们就可以在 SQL 中直接调用,执行测试: sql = """ with tmp as ( select key, ols4(list((x1, x2)), list(y)) as coef from df group by all ) select key, coef[1] as const, coef[2] as x1, coef[3] as x2 ...
AI代码解释 DCREATETABLEschedule_rawASSELECT*FROM'https://duckdb.org/data/schedule.csv';DDSELECT*FROMschedule_raw;┌────────────────────┬──────────────┬──────────────────┐ │ timeslot │ location │ event │ │ varchar │ var...
点操作符：https://duckdb.org/docs/sql/functions/overview#function-chaining-via-the-dot-operatorcoalesce函数：https://duckdb.org/docs/sql/functions/utility#coalesceexpr-WITH子句：https://duckdb.org/docs/sql/query_syntax/withCREATE TABLE … AS SELECT语句：https://duckdb.org/docs/sql/statements/cre...
con.sql("CREATE TABLE test (i INTEGER)") con.sql("INSERT INTO test VALUES (42)") con.table("test").show() con.close() [root@hfserver1 soft]# python test.py ┌───────┐ │ i │ │ int32 │ ├───────┤ ...
We can now download the taxi+_zone_lookup.csv file to map a zone ID with a zone name and an associated borough name and insert the data into the locations table with the read_csv DuckDB function: DINSERTINTOlocations(LocationID, Borough, Zone, service_zone)SELECTLocationID, ...
Now create a new Python file and paste the following code: import duckdb # Function to get the count from a single file def get_row_count_from_file(conn: duckdb.DuckDBPyConnection, file_path: str) -> int: query = f""" SELECT COUNT(*) FROM PARQUET_SCAN("{file_path}") """ return...
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duckdb.sql("""CREATE TABLE ontime ( FlightDate DATE, UniqueCarrier VARCHAR, OriginCityName VARCHAR, DestCityName VARCHAR ); COPY ontime FROM 'https://duckdb.org/data/flights.csv';""") 1. 2. 3. 4. 5. 6. 7. 8. 9. 也可以直接根据查询结果创建表: ...
Add sha1(varchar) -> varchar scalar function by @bradlarsen in #13020 Decimal to FloatingPoint: Avoid losing precision by splitting operation in two, more fixes and tests by @carlopi in #12627 Feature #1272: Segment Tree Finalize by @hawkfish in #13002 Create Delimiter Join and Delimiter ...