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- Set Operations 12851
- 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 semantics, i.e., they eliminate duplicates,
...erformed to combine 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., o...ows bag semantics. INTERSECT The INTERSECT clause can be used to select all rows that occur in the result of both queries. Vanilla INTERSECT (Set Semantics) Vanilla INTERSECT performs duplicate elimination, so only unique rows are returned. SELECT * FRO...([5, 6, 6, 7, 7, 9]); x 5 6 6 7 EXCEPT The EXCEPT clause can be used to select all rows that only occur in the left query. Vanilla EXCEPT (Set Semantics) Vanilla EXCEPT follows set semantics, therefore, it performs duplicate elimination, so only unique... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/setops.html
- Output Formats 8438
- The .mode dot command may be used to change the appearance of the tables returned in the terminal output. In addition to customizing the appearance, these modes have additional benefits. This can be useful for presenting DuckDB output elsew
...L table ASCII-art table tabs Tab-separated values tcl TCL list elements trash No output Changing the Output Format Use the vanilla .mode dot command to query the appearance currently in use. .mode current output mode: duckbox Use the .mode dot command w... - https://man.mtool.work/duckdb/2.0/clients/cli/output_formats.html
- Import Data 8346
- Overview The JDBC driver offers two ways to load data into DuckDB in bulk: the high-performance Appender and a JDBC batch writer. This page describes both and when to use each. Appender The Appender is available in the DuckDB JDBC driver vi
...t(1, 4); stmt.setObject(2, 5); stmt.setObject(3, 6); stmt.addBatch(); stmt.executeBatch(); stmt.close(); Batch Writer with Vanilla Statements The batch writer also accepts plain SQL statements that carry their values inline, without parameters. Queue ea... - https://man.mtool.work/duckdb/2.0/clients/java/data_import.html
- FROM and JOIN Clauses 8181
- The FROM clause specifies the source of the data on which the remainder of the query should operate. Logically, the FROM clause is where the query starts execution. The FROM clause can contain a single table, a combination of multiple table
...e the same iata attribute was present in both tables were included in the result. We can also express this query using the vanilla JOIN clause with the USING keyword: SELECT * FROM city_airport JOIN airport_names USING (iata); Semi and Anti Joins Semi j... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/from.html
- COPY Statement 8089
- Examples Read a CSV file into the lineitem table, using auto-detected CSV options: COPY lineitem FROM 'lineitem.csv'; Read a CSV file into the lineitem table, using manually specified CSV options: COPY lineitem FROM 'lineitem.csv' (DELIMITE
...extension (e.g., .parquet results in a Parquet file being written/read). If the file extension is unknown CSV is selected. Vanilla DuckDB provides CSV , PARQUET and JSON but additional copy functions can be added by extensions . VARCHAR auto USE_TMP_FIL... - https://man.mtool.work/duckdb/2.0/sql/statements/copy.html
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