在Amazon Quick Sight上使用SQL从多个表中拉出相同的列

Question

我正在使用Amazon Quick Sight从MySQL数据库中提取数据，为我的雇主生成可视化数据。我是一名学生并且拥有一点SQL经验，但之前从未涉及过这么大的数据库。

我需要抓取的表是001_leads到024_leads。这些表都是以相同的方式设计的。

这是我目前所做的无济于事。 Quick Sight不会发回错误警报，因此我一直在攻击不同的解决方案。

SELECT 001_leads.lead_received AS "City-A Leads Q1", 002_leads.lead_received AS "City-B Leads Q1" FROM 001_leads, 002_leads WHERE lead_received BETWEEN '2017-01-01' AND '2017-04-01'

我相当肯定我需要使用联接，但我不知道如何加入24个不同的表。

理想情况下，当此查询运行时，它将显示每个城市的每个潜在客户。

感谢您一看:)

编辑：

Answer 1

我认为Union就是你所追求的......不完全确定，你的问题的措辞。

例如

SELECT 001_leads.lead_received AS Leads
FROM 001_leads
WHERE lead_received BETWEEN '2017-01-01' AND '2017-04-01'

UNION 

SELECT 002_leads.lead_received
FROM 002_leads
WHERE lead_received BETWEEN '2017-01-01' AND '2017-04-01'

<强>更新

以下内容应该按照您的要求进行操作。

SELECT l1.lead_received AS LeadsCityA, l2.lead_received AS LeadsCityA, l3.lead_received AS LeadsCityA, l4.lead_received AS LeadsCityA
FROM 001_leads l1
LEFT JOIN 002_leads l2
    ON lead_received BETWEEN '2017-01-01' AND '2017-04-01'
LEFT JOIN 003_leads l3
    ON lead_received BETWEEN '2017-01-01' AND '2017-04-01'
LEFT JOIN 004_leads l4
    ON lead_received BETWEEN '2017-01-01' AND '2017-04-01'
WHERE lead_received BETWEEN '2017-01-01' AND '2017-04-01'

Answer 2

除非你真的需要一个数据透视表，否则我会建议使用一个联合并获得每行一行，就像@Darby建议的那样：

SELECT *
FROM (
    SELECT 
        'CityA' as `city`,
        a.*
    FROM `001_leads` a
    WHERE a.`lead_received` BETWEEN '2017-01-01' AND '2017-04-01'
    UNION
    SELECT 
        'CityB' as `city`,
        b.*
    FROM `001_leads` b
    WHERE b.`lead_received` BETWEEN '2017-01-01' AND '2017-04-01'
    UNION
    SELECT 
        'CityC' as `city`,
        c.*
    FROM `001_leads` c
    WHERE c.`lead_received` BETWEEN '2017-01-01' AND '2017-04-01'
    UNION
    SELECT 
        'CityD' as `city`,
        d.*
    FROM `001_leads` d
    WHERE d.`lead_received` BETWEEN '2017-01-01' AND '2017-04-01'
    UNION
    SELECT 
        'CityE' as `city`,
        e.*
    FROM `001_leads` e
    WHERE e.`lead_received` BETWEEN '2017-01-01' AND '2017-04-01'
) as `all`
ORDER BY all.`lead_received`,all.`city`;

如果这是将来会在不同时间段内完成的查询，我建议您使用联盟创建一个视图，然后对视图进行选择。