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- SELECT Clause – DuckDB 14684
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...ELECT res : col1 + col2 , root : sqrt ( col1 ) 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 a...Columns can also be selected using regular expressions or lambda functions. See the star expression page for more details. DISTINCT Clause Select all unique cities from the addresses table: SELECT DISTINCT city FROM addresses ; The DISTINCT clause can be...d to return only the unique rows in the result – so that any duplicate rows are filtered out. Queries starting with SELECT DISTINCT run deduplication, which is an expensive operation. Therefore, only use DISTINCT if necessary. DISTINCT ON Clause Select o... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/select.html
- Non-Deterministic Behavior – DuckDB 10523
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...A' AS x UNION SELECT 'B' AS x ); Both results A , B and B , A are correct. Different Results on Different Platforms: array_distinct The array_distinct function may return results in a different order on different platforms : SELECT array_distinct ([ 'A'...SELECT 'A' AS x UNION SELECT 'B' AS x ) ORDER BY ALL ; You can also sort lists using list_sort : SELECT list_sort ( array_distinct ([ 'A' , 'A' , 'B' , NULL , NULL ])) AS i ORDER BY i ; It's also possible to introduce a deterministic shuffling . 関連キー...ワード results different query deterministic cases determinism distinct multi also threads sort Operations DuckDB behavior semantics order threaded using ordering expected Working Around Determi... - https://man.mtool.work/duckdb/1.3/operations_manual/non-deterministic_behavior.h...
- Bitstring Functions – DuckDB 9985
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...operation performed on all bitstrings in a given expression. bitstring_agg(arg) Returns a bitstring with bits set for each distinct position defined in arg . bitstring_agg(arg, min, max) Returns a bitstring with bits set for each distinct position define...arg) Description The bitstring_agg function takes any integer type as input and returns a bitstring with bits set for each distinct value. The left-most bit represents the smallest value in the column and the right-most bit the maximum value. If possible...values. Example bitstring_agg(A) Tip The combination of bit_count and bitstring_agg can be used as an alternative to count(DISTINCT ...) , with possible performance improvements in cases of low cardinality and dense values. bitstring_agg(arg, min, max) D... - https://man.mtool.work/duckdb/1.3/sql/functions/bitstring.html
- Window Functions – DuckDB 9985
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...urpose window functions, with the minor consequence that the FILTER clause is not available for these but IGNORE NULLS is. DISTINCT Arguments All aggregate window functions support using a DISTINCT clause for the arguments. When the DISTINCT clause is pr...ovided, only distinct values are considered in the computation of the aggregate. This is typically used in combination with the COUNT aggregate...to get the number of distinct elements; but it can be used together with any aggregate function in the system. There are some aggregates that are insens... - https://man.mtool.work/duckdb/1.3/sql/functions/window_functions.html
- Aggregate Functions – DuckDB 9871
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...ales GROUP BY region HAVING sum ( amount ) > 100 ; Return the number of unique values in the region column: SELECT count ( DISTINCT region ) FROM sales ; Return two values, the total sum of amount and the sum of amount minus columns where the region is n...hange the cardinality of the result. As such, aggregates can only be used in the SELECT and HAVING clauses of a SQL query. DISTINCT Clause in Aggregate Functions When the DISTINCT clause is provided, only distinct values are considered in the computation...of the aggregate. This is typically used in combination with the count aggregate to get the number of distinct elements; but it can be used together with any aggregate function in the system. There are some aggregates that are insens... - https://man.mtool.work/duckdb/1.3/sql/functions/aggregates.html
- Comparisons – DuckDB 9234
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...equal to 4 >= NULL NULL = or == equal NULL = NULL NULL <> or != not equal 2 <> 2 false The table below shows the standard distinction operators. These operators treat NULL values as equal. Operator Description Example Result IS DISTINCT FROM not equal,...including NULL 2 IS DISTINCT FROM NULL true IS NOT DISTINCT FROM equal, including NULL NULL IS NOT DISTINCT FROM NULL true Combination Casting When per... - https://man.mtool.work/duckdb/1.3/sql/expressions/comparison_operators.html
- VACUUM Statement – DuckDB 8696
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...mostly provided for PostgreSQL-compatibility. Some variants of it, such as when calling for a given column, recompute the distinct statistics (the amount if distinct entities) if they have become stale due to updates. Warning The behavior of VACUUM is n...ace, refer to the “Reclaiming space” page . Syntax 関連キーワード column table statistics space statement PostgreSQL given distinct Reclaiming Documentation Statements Copy Markdown Statement support DuckDB mostly provided compatibility variants calling... - https://man.mtool.work/duckdb/1.3/sql/statements/vacuum.html
- Relational API – DuckDB 8582
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...set union of this relation object with another relation object in other_rel The union is union all . In order to retrieve distinct values, apply distinct . Parameters union_rel : duckdb.duckdb.DuckDBPyRelation The relation to union with the current rela...r Computes the bitwise XOR of all bits present in a given column bitstring_agg Computes a bitstring with bits set for each distinct value in a given column bool_and Computes the logical AND of all values present in a given column bool_or Computes the log...ume_dist Computes the cumulative distribution within the partition dense_rank Computes the dense rank within the partition distinct Retrieve distinct rows from this relation object favg Computes the average of all values present in a given column using a... - https://man.mtool.work/duckdb/1.3/clients/python/relational_api.html
- List Functions – DuckDB 8369
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...st2) Calculates the Euclidean distance between two points with coordinates given in two inputs lists of equal length. list_distinct(list) Removes all duplicates and NULL values from a list. Does not preserve the original order. list_dot_product(list1, li...ts with coordinates given in two inputs lists of equal length. Example list_distance([1, 2, 3], [1, 2, 5]) Result 2.0 list_distinct(list) Description Removes all duplicates and NULL values from a list. Does not preserve the original order. Example list_d...istinct([1, 1, NULL, -3, 1, 5]) Result [1, 5, -3] Alias array_distinct list_dot_product(list1, list2) Description Computes the dot product of two same-sized lists of numbers. Example list_dot_p... - https://man.mtool.work/duckdb/1.3/sql/functions/list.html
- SQL to/from JSON – DuckDB 8059
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...","query_location":11,"value":{"type":{"id":"INTEGER"},"is_null":false,"value":2}}],"order_bys":{"type":"ORDER_MODIFIER"},"distinct":false,"is_operator":true,"export_state":false}],"from_table":{"type":"EMPTY","query_location":18446744073709551615},"aggr..."class":"COLUMN_REF","type":"COLUMN_REF","query_location":25,"column_names":["b"]}],"order_bys":{"type":"ORDER_MODIFIER"},"distinct":false,"is_operator":true,"export_state":false}],"from_table":{"type":"BASE_TABLE","query_location":32,"table_name":"tbl1"...},"aggregate_handling":"STANDARD_HANDLING"}}]} Skip the default values in the AST (e.g., "distinct":false ): SELECT json_serialize_sql ( 'SELECT 1 + 2; SELECT a + b FROM tbl1' , skip_default : = true , skip_empty : = true... - https://man.mtool.work/duckdb/1.3/data/json/sql_to_and_from_json.html
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