-1
任何人都可以给我一个简单的使用“Group By”的例子吗？没有任何聚合函数？Group by without aggregation function
它是做什么的？它是否对结果进行排序？我找不到任何没有聚合功能的好例子。
A
回答
1
是什么样的GROUP BY语句，没有附加的聚合函数？
您可以通过使用GROUP BY没有任何聚集执行DISTINCT选择。
在这种情况下使用DISTINCT将是一个同义词，但您希望/必须定义GROUP BY子句的原因是为了能够定义HAVING子句详细信息。
如果您需要定义一个HAVING条款，你有定义GROUP BY - 你不能DISTINCT做结合。
1
相关问题
- 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并从中获取一个值
- 7. MySQL group by without column name
- 8. Linq to Sql Group By without count
- 9. SQL order by，group by，distinct和aggregation函数的进程顺序？
- 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）多个属性
- 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后ORDER BY
- 30. SQL ORDER BY GROUP BY
，因为你的问题被标记为只__sql__它会做错误。在一些DBMS，如MySQL，它是允许的，但然后服务器可以自由选择任何行 –
好吧...所以它就像不同？它从每个不同的结果中选择任何行？ – Ohad