-1
任何人都可以給我一個簡單的使用「Group By」的例子嗎？沒有任何聚合函數？Group by without aggregation function
它是做什麼的？它是否對結果進行排序？我找不到任何沒有聚合功能的好例子。
A
回答
1
是什麼樣的GROUP BY語句，沒有附加的聚合函數？
您可以通過使用GROUP BY沒有任何聚集執行DISTINCT選擇。
在這種情況下使用DISTINCT將是一個同義詞，但您希望/必須定義GROUP BY子句的原因是爲了能夠定義HAVING子句詳細信息。
如果您需要定義一個HAVING條款，你有定義GROUP BY - 你不能DISTINCT做結合。
1
相關問題
- 1. HAVING without GROUP BY
- 2. Group by by mongoDb without count
- 3. SQL Join Query - Group By/Aggregation
- 4. SQL Aggregrates without GROUP BY
- 5. SQL group by function error
- 6. group by without aggregate function並從中獲取一個值
- 7. MySQL group by without column name
- 8. Linq to Sql Group By without count
- 9. SQL order by，group by，distinct和aggregation函數的進程順序？
- 10. group by all enum values without enum values
- 11. mysql group and sort without order by out out most
- 12. Grails createCriteria group by（groupProperty function）多個屬性
- 13. SQL Server ORDER BY [aggregation] DESC/ASC
- 14. order by by group by
- 15. ORDER BY GROUP BY
- 16. group by by desc
- 17. group by by rollup
- 18. group by by django
- 19. $ group by by undefined
- 20. group by by by by mysql
- 21. SQL Group By By By By Count
- 22. Mysql group by by by by？
- 23. MongoDB Query with group by
- 24. Sass error「Function X finished without @return」
- 25. sql group by sub group
- 26. GROUP BY
- 27. Django group by foreign key id
- 28. SQL ORDER BY GROUP BY
- 29. GROUP BY後ORDER BY
- 30. SQL ORDER BY GROUP BY
，因爲你的問題被標記爲只__sql__它會做錯誤。在一些DBMS，如MySQL，它是允許的，但然後服務器可以自由選擇任何行 –
好吧...所以它就像不同？它從每個不同的結果中選擇任何行？ – Ohad