选择具有不同 where 条件的同一列

Posted 2023-02-16

【中文标题】选择具有不同 where 条件的同一列

【英文标题】：Selecting same column with different where conditions

【发布时间】：2011-03-31 05:50:48

【问题描述】：

此查询返回特定日期范围内特定销售人员的“已关闭”每日销售额的总和：

SELECT SUM(price) as closed_total FROM dbo.Sales WHERE salesperson_ID = @salesperson_ID AND date_ordered BETWEEN @start_date AND @end_date 和关闭 = 1 GROUP BY date_ordered

输出如下：

每日总计 200 150 325 120 （等等）

我想修改查询以返回一列用于已完成销售，一列用于所有销售（相同的查询，但没有“已关闭 = 1”条件），输出如下：

关闭总计 | all_total 200 | 275 150 | 150 325 | 500 120 | 280 （等等）

我尝试使用 UNION 来组合单独的查询，如下所示：

SELECT SUM(price) as closed_total FROM dbo.Sales WHERE salesperson_ID = @salesperson_ID AND date_ordered BETWEEN @start_date AND @end_date 和关闭 = 1 GROUP BY date_ordered 联合所有 选择总和（价格）作为 all_total FROM dbo.Sales WHERE salesperson_ID = @salesperson_ID AND date_ordered BETWEEN @start_date AND @end_date GROUP BY date_ordered

我认为这可能符合我的要求，但它将两个总和放入名为“closed_total”的单个列中。有什么想法吗？

【参考方案1】：

你可以试试这个

SELECT SUM(price) as total, SUM(CASE WHEN closed = 1 THEN price ELSE 0 END) as closed_total
 FROM   dbo.Sales
 WHERE  salesperson_ID = @salesperson_ID
        AND date_ordered BETWEEN @start_date AND @end_date
 GROUP BY date_ordered