Results of 1 - 10 of about 30 for exists (0.003 sec.)
- Subqueries – DuckDB 14930
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...the subquery is less than or equal to 5. The quantifier SOME maybe used instead of ANY : ANY and SOME are interchangeable. EXISTS The EXISTS operator tests for the existence of any row inside the subquery. It returns either true when the subquery retur...ns one or more records, and false otherwise. The EXISTS operator is generally the most useful as a correlated subquery to express semijoin operations. However, it can be used as...ated subquery as well. For example, we can use it to figure out if there are any grades present for a given course: SELECT EXISTS ( FROM grades WHERE course = 'Math' ) AS math_grades_present ; math_grades_present true SELECT EXISTS ( FROM grades WHERE... - https://man.mtool.work/duckdb/1.3/sql/expressions/subqueries.html
- TPC-H Extension – DuckDB 11469
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...does not clean up existing TPC-H tables. To clean up existing tables, use DROP TABLE before running dbgen : DROP TABLE IF EXISTS customer ; DROP TABLE IF EXISTS lineitem ; DROP TABLE IF EXISTS nation ; DROP TABLE IF EXISTS orders ; DROP TABLE IF EXIST...S part ; DROP TABLE IF EXISTS partsupp ; DROP TABLE IF EXISTS region ; DROP TABLE IF EXISTS supplier ; Running a Query To run a query, e.g., query 4, us... - https://man.mtool.work/duckdb/1.3/core_extensions/tpch.html
- CREATE TABLE Statement – DuckDB 9585
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...ing the existing table and then creating the new one. Create a table with two integer columns (i and j) even if t1 already exists: CREATE OR REPLACE TABLE t1 ( i INTEGER , j INTEGER ); IF NOT EXISTS The IF NOT EXISTS syntax will only proceed with the c...reation of the table if it does not already exist. If the table already exists, no action will be taken and the existing table will remain in the database. Create a table with two integer columns ( i a...nd j ) only if t1 does not exist yet: CREATE TABLE IF NOT EXISTS t1 ( i INTEGER , j INTEGER ); CREATE TABLE ... AS SELECT (CTAS) DuckDB supports the CREATE TABLE ... AS SELECT syntax, als... - https://man.mtool.work/duckdb/1.3/sql/statements/create_table.html
- CREATE SEQUENCE Statement – DuckDB 9487
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...alogue items. Overwrite an existing sequence: CREATE OR REPLACE SEQUENCE serial ; Only create sequence if no such sequence exists yet: CREATE SEQUENCE IF NOT EXISTS serial ; Remove sequence: DROP SEQUENCE serial ; Remove sequence if exists: DROP SEQUEN...CE IF EXISTS serial ; Using Sequences for Primary Keys Sequences can provide an integer primary key for a table. For example: CREATE SE...ssion exit. Existing permanent sequences with the same name are not visible (in this session) while the temporary sequence exists, unless they are referenced with schema-qualified names. Sequences are based on BIGINT arithmetic, so the range cannot exc... - https://man.mtool.work/duckdb/1.3/sql/statements/create_sequence.html
- CREATE INDEX Statement – DuckDB 9390
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...venue of table films : CREATE INDEX s_idx ON films ( revenue ); Create index if it does not yet exist: CREATE INDEX IF NOT EXISTS s_idx ON films ( revenue ); The CREATE INDEX IF NOT EXISTS statement does not have an “early exit” at the moment, instead,...only check its existence before committing it to storage. Therefore, it may run for a longer time compared to other IF NOT EXISTS statements, which terminate early. Create compound index gy_idx on genre and year columns: CREATE INDEX gy_idx ON films (...ndex from the database system. Examples Remove the index title_idx : DROP INDEX title_idx ; Parameters Name Description IF EXISTS Do not throw an error if the index does not exist. name The name of an index to remove. Syntax Limitations The CREATE INDE... - https://man.mtool.work/duckdb/1.3/sql/statements/create_index.html
- CREATE SCHEMA Statement – DuckDB 8984
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...hema is main . Examples Create a schema: CREATE SCHEMA s1 ; Create a schema if it does not exist yet: CREATE SCHEMA IF NOT EXISTS s2 ; Create a schema or replace a schema if it exists: CREATE OR REPLACE SCHEMA s2 ; Create table in the schemas: CREATE T...ate schemas Documentation Statements Copy Markdown Statement statement creates catalog default main Examples exist replace exists table Compute join between tables Syntax 関連するページ USE Statement CREATE VIEW Statement List Tables CREATE TYPE Statem... - https://man.mtool.work/duckdb/1.3/sql/statements/create_schema.html
- CREATE VIEW Statement – DuckDB 8886
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...s Create a simple view: CREATE VIEW v1 AS SELECT * FROM tbl ; Create a view or replace it if a view with that name already exists: CREATE OR REPLACE VIEW v1 AS SELECT 42 ; Create a view and replace the column names: CREATE VIEW v1 ( a ) AS SELECT 42 ;...un every time the view is referenced in a query. CREATE OR REPLACE VIEW is similar, but if a view of the same name already exists, it is replaced. If a schema name is given then the view is created in the specified schema. Otherwise, it is created in t...name of any other view or table in the same schema. 関連キーワード view schema query Create views defines replace already exists duckdb given created Documentation Statements Copy Markdown Statement statement catalog Examples column names behind exist... - https://man.mtool.work/duckdb/1.3/sql/statements/create_view.html
- WITH Clause – DuckDB 8399
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...(1) no cycles occur and (2) only nodes that -- were not visited by previous (shorter) paths are added to a path. WHERE NOT EXISTS ( FROM paths previous_paths WHERE list_contains ( previous_paths.path , node2id ) ) ) SELECT startNode , endNode , path FR...WEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING ) AS endReached FROM paths JOIN edge ON paths.endNode = node1id WHERE NOT EXISTS ( FROM paths previous_paths WHERE list_contains ( previous_paths.path , node2id ) ) AND paths.endReached = 0 ) SELECT star...n produces a row with key k , it replaces a row with the same key k in the union table (like a dictionary). If no such row exists in the union table yet, the new row is appended to the union table as usual. This allows a CTE to exercise fine-grained co... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/with.html
- Join Operations – DuckDB 8188
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...FROM t1 ...; -- compute the final result using t2 SELECT * FROM t1 ... To clean up, drop the interim tables: DROP TABLE IF EXISTS t1 ; DROP TABLE IF EXISTS t2 ; 関連キーワード join order query Join DuckDB optimizer tables following optimizers Order tur... - https://man.mtool.work/duckdb/1.3/guides/performance/join_operations.html
- ATTACH and DETACH Statements – DuckDB 8188
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...S sqlite_db ( TYPE sqlite ); Attach the database file.db if inferred database alias file does not yet exist: ATTACH IF NOT EXISTS 'file.db' ; Attach the database file.db if explicit database alias file_db does not yet exist: ATTACH IF NOT EXISTS 'file....db' AS file_db ; Attach the database file2.db as alias file_db detaching and replacing the existing alias if it exists: ATTACH OR REPLACE 'file2.db' AS file_db ; Create a table in the attached database with alias file : CREATE TABLE file.new... - https://man.mtool.work/duckdb/1.3/sql/statements/attach.html
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