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GROUP BY clause
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
GROUP BY can be used to create unique groups of data, to form aggregations, to remove duplicates and for other reasons. It will transform your previously defined set of table expressions, and return only one record per unique group as specified in this clause.
Table of contents
- 3.5.3.10.1.
- GROUP BY columns
- 3.5.3.10.2.
- GROUP BY column index
- 3.5.3.10.3.
- GROUP BY tables
- 3.5.3.10.4.
- GROUP BY ROLLUP
- 3.5.3.10.5.
- GROUP BY CUBE
- 3.5.3.10.6.
- GROUP BY GROUPING SETS
- 3.5.3.10.7.
- GROUP BY empty grouping set
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References to this page
- GROUP BY tables
- GROUP BY empty grouping set
- HAVING clause
- Lexical and logical SELECT clause order
- Scalar functions
- ARRAY constructor from subquery
- Grouping
- Filtering
- PARTITION BY
- User-defined aggregate functions
- GROUP BY <column index>
- Unnecessary DISTINCT
- Unnecessary GROUP BY expressions
- Unnecessary scalar subquery
- SQL: Rely on implicit ordering
- SQL: SELECT DISTINCT
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