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- PIVOT Statement – DuckDB 13451
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...ity 2020 8772 PIVOT ON and USING Use the PIVOT statement below to create a separate column for each year and calculate the total population in each. The ON clause specifies which column(s) to split into separate columns. It is equivalent to the column...column are calculated for each year and are split into separate columns. PIVOT cities ON year USING sum ( population ) AS total , max ( population ) AS max GROUP BY country ; country 2000_total 2000_max 2010_total 2010_max 2020_total 2020_max US 8579...sing multiple value expressions and multiple columns in the FOR clause. SELECT * FROM cities PIVOT ( sum ( population ) AS total , count ( population ) AS count FOR year IN ( 2000 , 2010 ) country IN ( 'NL' , 'US' ) ); name 2000_NL_total 2000_NL_count... - https://man.mtool.work/duckdb/1.3/sql/statements/pivot.html
- SET VARIABLE and RESET VARIABLE Statements – DuckDB 11307
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...able, which can be accessed using the getvariable call: SET VARIABLE my_var = 30 ; SELECT 20 + getvariable ( 'my_var' ) AS total ; total 50 If SET VARIABLE is invoked on an existing variable, it will overwrite its value: SET VARIABLE my_var = 30 ; SET...VARIABLE my_var = 100 ; SELECT 20 + getvariable ( 'my_var' ) AS total ; total 120 Variables can have different types: SET VARIABLE my_date = DATE '2018-07-13' ; SET VARIABLE my_string = 'Hello...; SELECT getvariable ( 'my_var' ) AS my_var ; my_var NULL Syntax 関連キーワード getvariable files variable list Variables total DuckDB Statements supports variables using Variable scope affect statement also read filename column exclude Syntax Docume... - https://man.mtool.work/duckdb/1.3/sql/statements/set_variable.html
- Timestamp Functions – DuckDB 11144
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...h) name of the weekday. epoch_ms(ms) Converts milliseconds since the epoch to a timestamp. epoch_ms(timestamp) Returns the total number of milliseconds since the epoch. epoch_ns(timestamp) Returns the total number of nanoseconds since the epoch. epoch..._us(timestamp) Returns the total number of microseconds since the epoch. epoch(timestamp) Returns the total number of seconds since the epoch. extract(fiel...poch to a timestamp. Example epoch_ms(701222400000) Result 1992-03-22 00:00:00 epoch_ms(timestamp) Description Returns the total number of milliseconds since the epoch. Example epoch_ms(TIMESTAMP '2021-08-03 11:59:44.123456') Result 1627991984123 epoc... - https://man.mtool.work/duckdb/1.3/sql/functions/timestamp.html
- CLI Charting with YouPlot – DuckDB 9991
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...n_auto('input.json')" To prepare the data for YouPlot, write a simple aggregate: duckdb -s "SELECT date, sum(purchases) AS total_purchases FROM read_json_auto('input.json') GROUP BY 1 ORDER BY 2 DESC LIMIT 10" Finally, wrap the SELECT in the COPY ......e full DuckDB command below outputs the query in CSV format with a header: duckdb -s "COPY (SELECT date, sum(purchases) AS total_purchases FROM read_json_auto('input.json') GROUP BY 1 ORDER BY 2 DESC LIMIT 10) TO '/dev/stdout' WITH (FORMAT csv, HEADER...the data to the uplot command to draw a plot of the Top 10 Purchase Dates duckdb -s "COPY (SELECT date, sum(purchases) AS total_purchases FROM read_json_auto('input.json') GROUP BY 1 ORDER BY 2 DESC LIMIT 10) TO '/dev/stdout' WITH (FORMAT csv, HEADER... - https://man.mtool.work/duckdb/1.3/guides/data_viewers/youplot.html
- FILTER Clause – DuckDB 9666
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...will include NULL values in the list result, while the FILTER clause will remove them. Examples Return the following: The total number of rows The number of rows where i <= 5 The number of rows where i is odd SELECT count () AS total_rows , count ()...FILTER ( i <= 5 ) AS lte_five , count () FILTER ( i % 2 = 1 ) AS odds FROM generate_series ( 1 , 10 ) tbl ( i ); total_rows lte_five odds 10 5 5 Simply counting rows that satisfy a condition can also be achieved without FILTER clause, using...first aggregate clause NULLs five odds median also stacked approach functions values using generate multiple pivot columns total number series Syntax Clause 関連するページ Aggregate Functions GROUPING SETS SELECT Clause LIMIT and OFFSET Clauses PIVOT... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/filter.html
- Tuning Workloads – DuckDB 9325
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...hat each step in the query takes. Note that due to multi-threading, adding up the individual times will be larger than the total query processing time. Query plans can point to the root of performance issues. A few general directions: Avoid nested loo...a time. If a query must make many small requests over the network, increasing DuckDB's threads setting to larger than the total number of CPU cores (approx. 2-5 times CPU cores) can improve parallelism and performance. Avoid Reading Unnecessary Data...s in reducing IO. To inspect how much remote data is transferred for a query, EXPLAIN ANALYZE can be used to print out the total number of requests and total data transferred for queries on remote files. Caching Starting with version 1.3.0, DuckDB sup... - https://man.mtool.work/duckdb/1.3/guides/performance/how_to_tune_workloads.html
- Window Functions – DuckDB 8675
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...revious-by- time amount : SELECT amount - lag ( amount ) OVER ( ORDER BY time ) FROM sales ; Compute the percentage of the total amount of sales per region for each row: SELECT amount / sum ( amount ) OVER ( PARTITION BY region ) FROM sales ; Syntax W...ume_dist([ORDER BY ordering]) The cumulative distribution: (number of partition rows preceding or peer with current row) / total partition rows. dense_rank() The rank of the current row without gaps; this function counts peer groups. first_value(expr[...partition as equally as possible. percent_rank([ORDER BY ordering]) The relative rank of the current row: (rank() - 1) / (total partition rows - 1) . rank_dense() The rank of the current row without gaps . rank([ORDER BY ordering]) The rank of the cu... - https://man.mtool.work/duckdb/1.3/sql/functions/window_functions.html
- SELECT Clause – DuckDB 8675
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...l1 ) FROM table_name ; Select all unique cities from the addresses table: SELECT DISTINCT city FROM addresses ; Return the total number of rows in the addresses table: SELECT count ( * ) FROM addresses ; Select all columns except the city column from...results. For example, using DISTINCT ON on the key column(s) of a table guarantees full uniqueness. Aggregates Return the total number of rows in the addresses table: SELECT count ( * ) FROM addresses ; Return the total number of rows in the addresse... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/select.html
- Configuration – DuckDB 8512
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...SELECT * FROM duckdb_settings () WHERE name = 'threads' ; name value description input_type scope threads 1 The number of total threads used by the system. BIGINT GLOBAL Show a list of all available settings. SELECT * FROM duckdb_settings (); Reset t...maximum index scan count sets a threshold for index scans. If fewer than MAX(index_scan_max_count, index_scan_percentage * total_row_count) rows match, we perform an index scan instead of a table scan. UBIGINT 2048 index_scan_percentage The index scan...percentage sets a threshold for index scans. If fewer than MAX(index_scan_max_count, index_scan_percentage * total_row_count) rows match, we perform an index scan instead of a table scan. DOUBLE 0.001 lock_configuration Whether or not th... - https://man.mtool.work/duckdb/1.3/configuration/overview.html
- Pragmas – DuckDB 8512
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...column types of the returned results are given below: database_name VARCHAR , -- database name database_size VARCHAR , -- total block count times the block size block_size BIGINT , -- database block size total_blocks BIGINT , -- total blocks in the d...: PRAGMA user_agent ; Metadata Information The following statement returns information on the metadata store ( block_id , total_blocks , free_blocks , and free_list ): PRAGMA metadata_info ; Progress Bar Show progress bar when running queries: PRAGMA... - https://man.mtool.work/duckdb/1.3/configuration/pragmas.html
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