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- ORDER BY Clause – DuckDB 13402
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...lly be followed by an order modifier ( ASC or DESC , default is ASC ), and/or a NULL order modifier ( NULLS FIRST or NULLS LAST , default is NULLS LAST ). ORDER BY ALL The ALL keyword indicates that the output should be sorted by every column in orde...The direction of this sort may be modified using either ORDER BY ALL ASC or ORDER BY ALL DESC and/or NULLS FIRST or NULLS LAST . Note that ALL may not be used in combination with other expressions in the ORDER BY clause – it must be by itself. See e...xamples below. NULL Order Modifier By default, DuckDB sorts ASC and NULLS LAST , i.e., the values are sorted in ascending order and NULL values are placed last. This is identical to the default sort or... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/orderby.html
- Enum Functions – DuckDB 12581
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...urns the numeric value backing the given enum value. enum_first(enum) Returns the first value of the input enum type. enum_last(enum) Returns the last value of the input enum type. enum_range(enum) Returns all values of the input enum type as an arra...num_first(enum) Description Returns the first value of the input enum type. Example enum_first(NULL::mood) Result sad enum_last(enum) Description Returns the last value of the input enum type. Example enum_last(NULL::mood) Result anxious enum_range(e...LL , the result starts with the first value of the enum type. When the second parameter is NULL , the result ends with the last value of the enum type. Example enum_range_boundary(NULL, 'happy'::mood) Result [sad, ok, happy] 関連キーワード enum type... - https://man.mtool.work/duckdb/1.3/sql/functions/enum.html
- List Functions – DuckDB 9818
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...gin:end:step] list_slice in bracket notation with an added step feature. array_pop_back(list) Returns the list without the last element. array_pop_front(list) Returns the list without the first element. flatten(list_of_lists) Concatenate a list of li...ture. Example [4, 5, 6][:-:2] Result [4, 6] Alias list_slice array_pop_back(list) Description Returns the list without the last element. Example array_pop_back([4, 5, 6]) Result [4, 5] array_pop_front(list) Description Returns the list without the fi...is an empty list Bracket Notation: When begin is omitted, it defaults to the beginning of the list end Is the index of the last element to be included in the slice When end < 0 the index is counted from the end of the list When end > length , end is... - https://man.mtool.work/duckdb/1.3/sql/functions/list.html
- Window Functions – DuckDB 9818
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...h offset and default are evaluated with respect to the current row. If omitted, offset defaults to 1 and default to NULL . last_value(expr[ ORDER BY ordering][ IGNORE NULLS]) Returns expr evaluated at the row that is the last row (among rows with a n...e frame using the provided ordering instead of the frame ordering. Return type Same type as expr Aliases lag(column, 3, 0) last_value(expr[ ORDER BY ordering][ IGNORE NULLS]) Description Returns expr evaluated at the row that is the last row (among r...s set) of the window frame. If omitted, offset defaults to 1 and default to NULL . If an ORDER BY clause is specified, the last row is determined within the frame using the provided ordering instead of the frame ordering. Return type Same type as exp... - https://man.mtool.work/duckdb/1.3/sql/functions/window_functions.html
- Relational API – DuckDB 9534
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...olumn histogram Computes the histogram over all values present in a given column lag Computes the lag within the partition last Returns the last value of a given column last_value Computes the last value within the group or partition lead Computes th...│ │ value is uneven │ 9 │ value is even │ └─────────────────┴───────┴───────────────────────────────────────────────────┘ last Signature last ( self : duckdb . duckdb . DuckDBPyRelation , column : str , groups : str = '' , projected_columns : str =...'' ) -> duckdb . duckdb . DuckDBPyRelation Description Returns the last value of a given column Parameters column : str The column name from which to retrieve the last value. groups : str, defau... - https://man.mtool.work/duckdb/1.3/clients/python/relational_api.html
- Aggregate Functions – DuckDB 9266
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...hem this clause is parsed and ignored. ORDER BY Clause in Aggregate Functions An ORDER BY clause can be provided after the last argument of the function call. Note the lack of the comma separator before the clause. SELECT aggregate_function ( arg , s...However, there are some order-sensitive aggregates that can have non-deterministic results without ordering, e.g., first , last , list and string_agg / group_concat / listagg . These can be made deterministic by ordering the arguments. For example: C...Handling NULL Values All general aggregate functions ignore NULL s, except for list ( array_agg ), first ( arbitrary ) and last . To exclude NULL s from list , you can use a FILTER clause . To ignore NULL s from first , you can use the any_value aggr... - https://man.mtool.work/duckdb/1.3/sql/functions/aggregates.html
- Date Functions – DuckDB 9266
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...isinf(date) Returns true if the date is infinite, false otherwise. julian(date) Extract the Julian Day number from a date. last_day(date) The last day of the corresponding month in the date. least(date, date) The earlier of two dates. make_date(year,...rue julian(date) Description Extract the Julian Day number from a date. Example julian(DATE '1992-09-20') Result 2448886.0 last_day(date) Description The last day of the corresponding month in the date. Example last_day(DATE '1992-09-20') Result 1992... - https://man.mtool.work/duckdb/1.3/sql/functions/date.html
- Pragmas – DuckDB 8713
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...ault_collation = 'nocase' ; Default Ordering for NULLs Set the default ordering for NULLs to be either NULLS_FIRST , NULLS_LAST , NULLS_FIRST_ON_ASC_LAST_ON_DESC or NULLS_LAST_ON_ASC_FIRST_ON_DESC : SET default_null_order = 'NULLS_FIRST' ; SET defaul...t_null_order = 'NULLS_LAST_ON_ASC_FIRST_ON_DESC' ; Set the default result set ordering direction to ASCENDING or DESCENDING : SET default_order = 'AS...tents will be overwritten for every newly issued query. Hence, the file will only contain the profiling information of the last run query: SET profiling_output = '/path/to/file.json' ; SET profile_output = '/path/to/file.json' ; Profiling Mode By def... - https://man.mtool.work/duckdb/1.3/configuration/pragmas.html
- Directly Reading Files – DuckDB 8713
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...put the content of each file as a VARCHAR or BLOB , respectively, as well as additional metadata such as the file size and last modified time. read_text The read_text table function reads from the selected source(s) to a VARCHAR . Each file results i...ll key default extra filename VARCHAR YES NULL NULL NULL content VARCHAR YES NULL NULL NULL size BIGINT YES NULL NULL NULL last_modified TIMESTAMP YES NULL NULL NULL Handling Missing Metadata In cases where the underlying filesystem is unable to prov...ta won't be read into DuckDB. 関連キーワード read table files content size text blob filename column functions DuckDB glob last reads selected parse path Hello World three valid instead Documentation Guides Formats 関連するページ Caveats Reading and... - https://man.mtool.work/duckdb/1.3/guides/file_formats/read_file.html
- Timestamp Functions – DuckDB 8713
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...urns true if the timestamp is infinite, false otherwise. julian(timestamp) Extract the Julian Day number from a timestamp. last_day(timestamp) The last day of the month. least(timestamp, timestamp) The earlier of two timestamps. make_timestamp(bigint...ract the Julian Day number from a timestamp. Example julian(TIMESTAMP '1992-03-22 01:02:03.1234') Result 2448704.043091706 last_day(timestamp) Description The last day of the month. Example last_day(TIMESTAMP '1992-03-22 01:02:03.1234') Result 1992-0... - https://man.mtool.work/duckdb/1.3/sql/functions/timestamp.html
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