Question

我可以有一个示例“SELECT”查询，它包含所有where，orderby，having和groupby子句....

解释会有所帮助。

Answer 1

今年客户为从最大到最小订购超过10,000美元的客户订单总结：

SELECT ClientName, SUM(OrderTotal) AS OrderTotal
FROM Orders
WHERE OrderDate >= '2012-01-01'
GROUP BY ClientName
HAVING SUM(OrderTotal) > 10000
ORDER BY SUM(OrderTotal) DESC

Answer 2

SELECT Customer, SUM(OrderPrice) FROM Orders WHERE Customer='tehlulz' OR Customer='Vijay' GROUP BY Customer HAVING SUM(OrderPrice)>1500 ORDER BY Customer

稍微分解一下：

WHERE：用于定义条件。

HAVING：之所以使用是因为WHERE关键字不能与聚合函数一起使用。

GROUP BY：按特定字段对结果进行分组

ORDER BY：显示结果顺序（如价格从大到小）

Sql在哪里，按顺序排序，拥有和按查询分组

2 个答案: