DuckDB支持各种SQL命令,包括SELECT、INSERT、UPDATE和DELETE。 以下是一个使用DuckDB创建数据库、表和向表中加载数据的一个简单示例: CREATE DATABASE my_database; USE my_database; CREATE TABLE my_table (id INTEGER, name TEXT, age INTEGER); INSERT INTO my_table VALUES(1, 'John', 30), (2, '...
注意:这些表只读,无法使用INSERT或UPDATE语句进行操作。 支持读取本地常见的结构化数据文件(csv/json和parquet等): duckdb.read_csv("data/csv/aws_locations.csv") duckdb.read_parquet("example.parquet") duckdb.read_json("example.json") 1. 2. 3. 也可以使用sql语句直接读取: duckdb.sql("select * from...
vacuum主要分vacuumfull和lazy vacuum 增CREATETABLECOPYINSERTINTOVALUES删DELETEasDROPTABLE改UPDATEALTERTABL RENAMEset查selectDISTINCTfromwheregroupbyORDERBYHAVING 阶段02: JoinsBetweenTables:LEFTOUTERJOINONAggregate Functions: max PIVOTONandUSINGUNPIVOTWINDOWQUALIFY 持久化IO:CopyFromCopyToEXPORT DATABASE SUMMARIZESEL...
在我们将数据添加到Local Storage后,我们需要对该Insert进行Commit。 stringDuckTransaction::Commit(AttachedDatabase&db,transaction_tcommit_id,boolcheckpoint)noexcept{// skip...try{storage->Commit(commit_state,*this);undo_buffer.Commit(iterator_state,log,commit_id);if(log){// commit any sequences tha...
以CLI工具使用为例:在本地计算机启动Shell后,会自动新建一个在内存中的DB,用户可以直接执行CREATE TABLE, ALTER TABLE, DROP TABLE等DDL命令和SELECT FROM, INSERT INTO, UPDATE, DELETE等DML命令;如需从本地文件读取数据进入已建好的表中,可以执行COPY命令;也可以免建表,直接通过read_csv_auto等方法直接读取本地...
Add support for materialized CTEs in INSERT/UPDATE/DELETE statements by @kryonix in #10878 Only throw exception if je_mallctl fails in DEBUG mode by @lnkuiper in #11303 Fixing casting issue in generators by @hannes in #11304 Rework FileSystem::OpenFile call, and add FILE_FLAGS_NULL_IF_NO...
void Update(GeoParquetColumnMetadata &meta, Vector &vector, idx_t count); }; struct GeoParquetFileMetadata { class GeoParquetFileMetadata { public: // Try to read GeoParquet metadata. Returns nullptr if not found, invalid or the required spatial extension is not // available. static unique_...
INSERT INTO forum.demo VALUES (42, 'DuckDB'); -- 查看该数据 D FROM forum.demo; ┌───────┬─────────┐│ id │ name ││ int32 │ varchar │├───────┼─────────┤│ 42 │ DuckDB │└───────┴─────────┘ -- 修改该数据 D...
OLTP is usually used for supporting user-facing applications as the queries are short and fast, the tables are normalized, and transactions such as INSERT, DELETE, or UPDATE are processed. OLAP is typically used for analyzing massive amounts of data. You’ll likely see the data stored in a...
注意:这些表只读,无法使用INSERT或UPDATE语句进行操作。 支持读取本地常见的结构化数据文件(csv/json和parquet等): duckdb.read_csv("data/csv/aws_locations.csv")duckdb.read_parquet("example.parquet")duckdb.read_json("example.json") 也可以使用sql语句直接读取: ...