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DuckDB 1.3 ドキュメント 全文検索
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- FILTER Clause – DuckDB 11228
- This page is for DuckDB 1.3, which is outdated.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
...leverage DuckDB's SQL engine for rapid, larger than memory pivoting. First generate an example dataset: CREATE TEMP TABLE stacked_data AS SELECT i , CASE WHEN i <= rows * 0.25 THEN 2022 WHEN i <= rows * 0.5 THEN 2023 WHEN i <= rows * 0.75 THEN 2024 WHE...ar = 2024 ) AS "2024" , count ( i ) FILTER ( year = 2025 ) AS "2025" , count ( i ) FILTER ( year IS NULL ) AS "NULLs" FROM stacked_data ; This syntax produces the same results as the FILTER clauses above: SELECT count ( CASE WHEN year = 2022 THEN i END...2024" , count ( CASE WHEN year = 2025 THEN i END ) AS "2025" , count ( CASE WHEN year IS NULL THEN i END ) AS "NULLs" FROM stacked_data ; 2022 2023 2024 2025 NULLs 25000000 25000000 25000000 12500000 12500000 However, the CASE WHEN approach will not wor... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/filter.html
- UNPIVOT Statement – DuckDB 7485
- This page is for DuckDB 1.3, which is outdated.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
...Demo Documentation / SQL / Statements Copy Markdown UNPIVOT Statement The UNPIVOT statement allows multiple columns to be stacked into fewer columns. In the basic case, multiple columns are stacked into two columns: a NAME column (which contains the na...s to take already pivoted data and re-stack it into a column each for the name and value. In this case, all months will be stacked into a month column and a sales column. UNPIVOT monthly_sales ON jan , feb , mar , apr , may , jun INTO NAME month VALUE s... - https://man.mtool.work/duckdb/1.3/sql/statements/unpivot.html
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