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- FROM and JOIN Clauses – DuckDB 12830
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...undamental relational operation used to connect two tables or relations horizontally. The relations are referred to as the left and right sides of the join based on how they are written in the join clause. Each result row has the columns from both re...er Joins Rows that do not have any matches can still be returned if an OUTER join is specified. Outer joins can be one of: LEFT (All rows from the left relation appear at least once) RIGHT (All rows from the right relation appear at least once) FULL...keyword: SELECT * FROM city_airport JOIN airport_names USING ( iata ); Semi and Anti Joins Semi joins return rows from the left table that have at least one match in the right table. Anti joins return rows from the left table that have no matches in... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/from.html
- Text Functions – DuckDB 11323
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...l order. Note that uppercase characters are considered smaller than lowercase characters and collations are not supported. left(string, count) Extracts the left-most count characters. left_grapheme(string, count) Extracts the left-most count grapheme...ng . lower(string) Converts string to lower case. lpad(string, count, character) Pads the string with the character on the left until it has count characters. Truncates the string on the right if it has more than count characters. ltrim(string[, char...acters]) Removes any occurrences of any of the characters from the left side of the string . characters defaults to space . md5(string) Returns the MD5 hash of the string as a VARCHAR . md5_numb... - https://man.mtool.work/duckdb/1.3/sql/functions/text.html
- Vector Similarity Search Extension – DuckDB 10913
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...ple of table macros to simplify matching multiple vectors against each other, so called "fuzzy joins". These are: vss_join(left_table, right_table, left_col, right_col, k, metric := 'l2sq') vss_match(right_table", left_col, right_col, k, metric := 'l...2sq') k is the number of records to be selected from the right_table for each left_table record, ordered by the score. These do not currently make use of the HNSW index but are provided as convenience util..., search_vec , vec , 2 ) res ; ┌───────┬─────────────────────────────────┬─────────────────────────────────────┐ │ score │ left_tbl │ right_tbl │ │ float │ struct(search_vec float[3]) │ struct(id integer, vec float[3]) │ ├───────┼────────────────────... - https://man.mtool.work/duckdb/1.3/core_extensions/vss.html
- AsOf Join – DuckDB 10503
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...tch and don't appear in the output. Outer AsOf Joins Because AsOf produces at most one match from the right hand side, the left side table will not grow as a result of the join, but it could shrink if there are missing times on the right. To handle t...his situation, you can use an outer AsOf Join: SELECT h.ticker , h.when , price * shares AS value FROM holdings h ASOF LEFT JOIN prices p ON h.ticker = p.ticker AND h.when >= p.when ORDER BY ALL ; As you might expect, this will produce NULL price...s and values instead of dropping left side rows when there is no ticker or the time is before the prices begin. ticker when value APPL 2000-12-31 23:59:30 APPL... - https://man.mtool.work/duckdb/1.3/guides/sql_features/asof_join.html
- SQLite Extension – DuckDB 9684
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...rom sakila-examples.sql : SELECT cat.name AS category_name , sum ( ifnull ( pay.amount , 0 )) AS revenue FROM category cat LEFT JOIN film_category flm_cat ON cat.category_id = flm_cat.category_id LEFT JOIN film fil ON flm_cat.film_id = fil.film_id LE...FT JOIN inventory inv ON fil.film_id = inv.film_id LEFT JOIN rental ren ON inv.inventory_id = ren.inventory_id LEFT JOIN payment pay ON ren.rental_id = pay.rental_id GROUP BY cat... - https://man.mtool.work/duckdb/1.3/core_extensions/sqlite.html
- Editing – DuckDB 9536
- 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
..., which has shortcuts that are based on Emacs mode of readline . Below is a list of available commands. Moving Key Action Left Move back a character Right Move forward a character Up Move up a line. When on the first line, move to previous history e...wn a line. When on last line, move to next history entry Home Move to beginning of buffer End Move to end of buffer Ctrl + Left Move back a word Ctrl + Right Move forward a word Ctrl + A Move to beginning of buffer Ctrl + B Move back a character Ctrl...+ E Move to end of buffer Ctrl + F Move forward a character Alt + Left Move back a word Alt + Right Move forward a word History Key Action Ctrl + P Move to previous history entry Ctrl + N Move... - https://man.mtool.work/duckdb/1.3/clients/cli/editing.html
- ORDER BY Clause – DuckDB 9405
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...ult is NULLS LAST ). ORDER BY ALL The ALL keyword indicates that the output should be sorted by every column in order from left to right. The direction of this sort may be modified using either ORDER BY ALL ASC or ORDER BY ALL DESC and/or NULLS FIRST...by city using German collation rules: SELECT * FROM addresses ORDER BY city COLLATE DE ; ORDER BY ALL Examples Order from left to right (by address, then by city, then by zip) in ascending order: SELECT * FROM addresses ORDER BY ALL ; address city z...111 Duck Duck Goose Ln Duck Town 11111-0001 111 Duck Duck Goose Ln DuckTown 11111 123 Quack Blvd DuckTown 11111 Order from left to right (by address, then by city, then by zip) in descending order: SELECT * FROM addresses ORDER BY ALL DESC ; address... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/orderby.html
- Join Operations – DuckDB 9127
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...PRAGMA s : SET disabled_optimizers = 'join_order,build_side_probe_side' ; This disables both the join order optimizer and left/right swapping for joins. This way, DuckDB builds a left-deep join tree following the order of JOIN clauses. SELECT ... FR...IF EXISTS t2 ; 関連キーワード join order query Join DuckDB optimizer tables following optimizers Order turn disabled side left performed first Documentation Guides Performance Copy Markdown Operations How to Force cost 関連するページ Order Preservat... - https://man.mtool.work/duckdb/1.3/guides/performance/join_operations.html
- SQL Introduction – DuckDB 8865
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...called an outer join. (The joins we have seen so far are inner joins.) The command looks like this: SELECT * FROM weather LEFT OUTER JOIN cities ON weather.city = cities.name ; city temp_lo temp_hi prcp date name lat lon San Francisco 46 50 0.25 199...sco 43 57 0.0 1994-11-29 San Francisco -194.000 53.000 Hayward 37 54 NULL 1994-11-29 NULL NULL NULL This query is called a left outer join because the table mentioned on the left of the join operator will have each of its rows in the output at least...once, whereas the table on the right will only have those rows output that match some row of the left table. When outputting a left-table row for which there is no right-table match, empty (null) values are substituted for t... - https://man.mtool.work/duckdb/1.3/sql/introduction.html
- Date Format Functions – DuckDB 8455
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...01, 02, …, 31 %-d Day of the month as a decimal number. 1, 2, …, 30 %f Microsecond as a decimal number, zero-padded on the left. 000000 - 999999 %g Millisecond as a decimal number, zero-padded on the left. 000 - 999 %G ISO 8601 year with century repr...al number. 00, 01, …, 59 %-M Minute as a decimal number. 0, 1, …, 59 %n Nanosecond as a decimal number, zero-padded on the left. 000000000 - 999999999 %p Locale's AM or PM. AM, PM %S Second as a zero-padded decimal number. 00, 01, …, 59 %-S Second as... - https://man.mtool.work/duckdb/1.3/sql/functions/dateformat.html
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