Results of 1 - 7 of about 7 for criteria (0.003 sec.)
- HAVING Clause 12959
- The HAVING clause can be used after the GROUP BY clause to provide filter criteria after the grouping has been completed. In terms of syntax the HAVING clause is identical to the WHERE clause, but while the WHERE clause occurs before the gr
... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/having.html
- ORDER BY Clause 9433
- ORDER BY is an output modifier. Logically it is applied near the very end of the query (just prior to LIMIT or OFFSET , if present). The ORDER BY clause sorts the rows on the sorting criteria in either ascending or descending order. In addi
... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/orderby.html
- SELECT Clause 8942
- The SELECT clause specifies the list of columns that will be returned by the query. While it appears first in the clause, logically the expressions here are executed only at the end. The SELECT clause can contain arbitrary expressions that
...lause. If an ORDER BY clause is present, the row that is returned is the first row that is encountered as per the ORDER BY criteria. If an ORDER BY clause is not present, the first row that is encountered is not defined and can be any row in the table. W... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/select.html
- SELECT Statement 8942
- The SELECT statement retrieves rows from the database. Examples Select all columns from the table tbl : SELECT * FROM tbl; Select the rows from tbl : SELECT j FROM tbl WHERE i = 3; Perform an aggregate grouped by the column i : SELECT i, su
...tput modifiers. Logically they are applied at the very end of the query. The ORDER BY clause sorts the rows on the sorting criteria in either ascending or descending order. The LIMIT clause restricts the amount of rows fetched, while the OFFSET clause in... - https://man.mtool.work/duckdb/2.0/sql/statements/select.html
- File Formats 8433
- Handling Parquet Files DuckDB has advanced support for Parquet files, which includes directly querying Parquet files . When deciding on whether to query these files directly or to first load them to the database, you need to consider severa
...a along the columns used in the filter condition. DuckDB will only need to read the folders and files that meet the filter criteria. This can be especially helpful when querying remote files. More Tips on Reading and Writing Parquet Files For tips on rea... - https://man.mtool.work/duckdb/2.0/guides/performance/file_formats.html
- Friendly SQL 8433
- DuckDB offers several advanced SQL features and syntactic sugar to make SQL queries more concise. We refer to these colloquially as “friendly SQL”. Several of these features were first introduced by DuckDB, while some are inspired by other
...'a', 'b', 'c',] AS y, 'hello world' AS z, ; "Top-N in Group" Queries Computing the "top-N rows in a group" ordered by some criteria is a common task in SQL that unfortunately often requires a complex query involving window functions and/or subqueries. To... - https://man.mtool.work/duckdb/2.0/sql/dialect/friendly_sql.html
- Aggregate Functions 6416
- Examples Produce a single row containing the sum of the amount column: SELECT sum(amount) FROM sales; Produce one row per unique region, containing the sum of amount for each group: SELECT region, sum(amount) FROM sales GROUP BY region; Ret
...call. Note the lack of the comma separator before the clause. SELECT ⟨aggregate_function⟩(⟨arg⟩, ⟨sep⟩ ORDER BY ⟨ordering_criteria⟩); This clause ensures that the values being aggregated are sorted before applying the function. Most aggregate functions... - https://man.mtool.work/duckdb/2.0/sql/functions/aggregates.html
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