Results of 1 - 10 of about 18 for semantics (0.003 sec.)
- Set Operations – DuckDB 15425
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...n / SQL / Query Syntax Copy Markdown Set Operations Set operations allow queries to be combined according to set operation semantics . Set operations refer to the UNION [ALL] , INTERSECT [ALL] and EXCEPT [ALL] clauses. The vanilla variants use set semanti...cs, i.e., they eliminate duplicates, while the variants with ALL use bag semantics. Traditional set operations unify queries by column position , and require the to-be-combined queries to have the same num...columns of different types where necessary. If this is not possible, the UNION clause throws an error. Vanilla UNION (Set Semantics) The vanilla UNION clause follows set semantics, therefore it performs duplicate elimination, i.e., only unique rows will... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/setops.html
- Non-Deterministic Behavior – DuckDB 9385
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...down Non-Deterministic Behavior Several operators in DuckDB exhibit non-deterministic behavior. Most notably, SQL uses set semantics, which allows results to be returned in a different order. DuckDB exploits this to improve performance, particularly when...ted behavior . If you would like to make your queries determinisic, see the “Working Around Non-Determinism” section . Set Semantics One of the most common sources of non-determinism is the set semantics used by SQL. E.g., if you run the following query r...ーワード results different query deterministic cases determinism distinct multi also threads sort Operations DuckDB behavior semantics order threaded using ordering expected Working Around Determinism following Different 関連するページ Result Verification E... - https://man.mtool.work/duckdb/1.3/operations_manual/non-deterministic_behavior.h...
- Versioning of Extensions – DuckDB 8664
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...3.11.0 probably is stable) Just like DuckDB itself , DuckDB extensions have their own version number. To ensure consistent semantics of these version numbers across the various extensions, DuckDB's Core Extensions use a versioning scheme that prescribes h...0.y.z format. In semantic versioning, versions starting with v0 have a special meaning: they indicate that the more strict semantics of regular ( >v1.0.0 ) versions do not yet apply. It basically means that an extensions is working towards becoming a stab...er in the pre-release format? The extension is compiled from the source code corresponding to the tag. Semantic Versioning semantics apply. See the Semantic Versioning specification for details. The extension follows a release cycle where new features are... - https://man.mtool.work/duckdb/1.3/extensions/versioning_of_extensions.html
- IN Operator – DuckDB 8664
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...CT 'English' IN ( 'CS' , 'Math' , NULL ); NULL IN [val1, val2, ...] (List) The IN operator works on lists according to the semantics used in Python. Unlike for the IN tuple operator , the presence of NULL values on the right hand side of the expression do...' , NULL ]; true SELECT 'English' IN [ 'CS' , 'Math' , NULL ]; false IN Map The IN operator works on maps according to the semantics used in Python, i.e., it checks for the presence of keys (not values): SELECT 'key1' IN MAP { 'key1' : 50 , 'key2' : 75 };...ession values used column English works checks right hand side lists maps subqueries return single tuple present according semantics presence Subquery example unnest 関連するページ Subqueries Profiling Queries Pattern Matching TRY expression CASE Expressi... - https://man.mtool.work/duckdb/1.3/sql/expressions/in.html
- Overview – DuckDB 8424
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...SQL Dialect Copy Markdown Overview DuckDB's SQL dialect is based on PostgreSQL. DuckDB tries to closely match PostgreSQL's semantics, however, some use cases require slightly different behavior. For example, interchangeability with data frame libraries ne...is Section 関連キーワード DuckDB PostgreSQL Documentation Dialect Copy Markdown Overview dialect based tries closely match semantics however cases require slightly different behavior example interchangeability frame libraries necessitates order 関連するペ... - https://man.mtool.work/duckdb/1.3/sql/dialect/overview.html
- Pattern Matching – DuckDB 8424
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...s: SELECT * FROM glob ( '*' ); file duckdb.exe test.csv test.json test.parquet test2.csv test2.parquet todos.json Globbing Semantics DuckDB's globbing implementation follows the semantics of Python's glob and not the glob used in the shell. A notable diff...Code of Conduct Trademark Use Blog In this article LIKE SIMILAR TO Globbing GLOB Glob Function to Find Filenames Globbing Semantics Regular Expressions... - https://man.mtool.work/duckdb/1.3/sql/functions/pattern_matching.html
- ALTER VIEW Statement – DuckDB 8424
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...2 ; ALTER VIEW changes the schema of an existing table. All the changes made by ALTER VIEW fully respect the transactional semantics, i.e., they will not be visible to other transactions until committed, and can be fully reverted through a rollback. Note...table fully Documentation Statements Copy Markdown Statement statement catalog Examples Rename made respect transactional semantics they visible transactions until committed reverted 関連するページ CREATE VIEW Statement Transaction Management CREATE SCHE... - https://man.mtool.work/duckdb/1.3/sql/statements/alter_view.html
- Pragmas – DuckDB 8184
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..._schema.tables" , "position" : "14" , "type" : "Table" , "error_subtype" : "MISSING_ENTRY" } IEEE Floating-Point Operation Semantics DuckDB follows IEEE floating-point operation semantics. If you would like to turn this off, run: SET ieee_floating_point_o...Object Cache Checkpointing Temp Directory for Spilling Data to Disk Returning Errors as JSON IEEE Floating-Point Operation Semantics Query Verification (for Development) Block Sizes... - https://man.mtool.work/duckdb/1.3/configuration/pragmas.html
- ATTACH and DETACH Statements – DuckDB 8064
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...ference the tables using their name: SET search_path = 'db1,db2' ; SELECT * FROM tbl1 ; SELECT * FROM tbl2 ; Transactional Semantics When running queries on multiple databases, the system opens separate transactions per database. The transactions are star...ase and Schema Changing the Default Database and Schema Resolving Conflicts Changing the Catalog Search Path Transactional Semantics... - https://man.mtool.work/duckdb/1.3/sql/statements/attach.html
- Utility Functions – DuckDB 7944
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...urns the union of tables given in tbl_names . If the optional by_name parameter is set to true , it uses UNION ALL BY NAME semantics. read_blob(source) Returns the content from source (a filename, a list of filenames, or a glob pattern) as a BLOB . See th...urns the union of tables given in tbl_names . If the optional by_name parameter is set to true , it uses UNION ALL BY NAME semantics. Example query_table(['t1', 't2']) Result (the union of the two tables) read_blob(source) Description Returns the content... - https://man.mtool.work/duckdb/1.3/sql/functions/utility.html
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