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doc-exports/docs/dws/tool/dws_16_0182.html
luhuayi a5e3903f6b DWS TG 910.211 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: luhuayi <luhuayi@huawei.com>
Co-committed-by: luhuayi <luhuayi@huawei.com>
2025-04-23 13:53:01 +00:00

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GROUP BY Conversion

During MySQL/ADB group query, non-group columns can be queried. During GaussDB(DWS) group query, only group columns and aggregate functions can be queried, and if non-group columns are queried, an error will be reported. Therefore, GROUP BY in GaussDB(DWS) is changed to allow querying on non-group columns.

Input

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SELECT e.department_id, department_name, ROUND(AVG(salary), 0) avg_salary FROM employees e JOIN departments d on e.department_id = d.department_id GROUP BY department_name ORDER BY department_name;

Output

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SELECT
  e.department_id,
  department_name,
  ROUND (AVG(salary), 0) AS "avg_salary"
FROM
  employees "e"
  JOIN departments "d" ON e.department_id = d.department_id
GROUP BY
  department_name,
  1
ORDER BY
  department_name;