帶有條件的MySQL SUM DISTINCT

Question

我需要使用條件語句以及DISTINCT值 和GROUP BY來收集總和。下面的例子是一個非常複雜的查詢的簡化版本。

因爲真正的查詢是非常大的，我需要避免大幅重新編寫查詢。

DATA

Contracts 
    id advertiser_id status 
    1 1    1 
    2 2    1 
    3 3    2 
    4 1    1 

一個查詢，已經接近

SELECT 
    COUNT(DISTINCT advertiser_id) AS advertiser_qty, 
    COUNT(DISTINCT id) AS contract_qty, 
    SUM(IF(status = 1, 1, 0)) AS current_qty, 
    SUM(IF(status = 2, 1, 0)) AS expired_qty, 
    SUM(IF(status = 3, 1, 0)) AS other_qty 
FROM (
     SELECT * FROM `contracts` 
     GROUP BY advertiser_id, id 
) AS temp 

目前返回

advertiser_qty contract_qty current_qty  expired_qty  other_qty 
3    4    3    1    0 

需要返回

advertiser_qty contract_qty current_qty  expired_qty  other_qty 
3    4    2    1    0 

哪裏current_qty爲2，它是與status = 1記錄僅DISTINCT advertiser_ids總和與每個和功能都需要相同的修訂。

我希望有人有一個簡單的解決方案，可以插入SUM功能。

-Thanks！

Answer 1

試試這個

SELECT 
    COUNT(DISTINCT advertiser_id) AS advertiser_qty, 
    COUNT(DISTINCT id) AS contract_qty, 
    (select count(distinct advertiser_id) from contracts where status =1 
    ) AS current_qty, 

    SUM(IF(status = 2, 1, 0)) AS expired_qty, 
    SUM(IF(status = 3, 1, 0)) AS other_qty 
    FROM (
    SELECT * FROM `contracts` 
    GROUP BY advertiser_id, id 
    ) AS temp 

DEMO HERE

編輯：

你可以看這個沒有再選擇。

SELECT COUNT(DISTINCT advertiser_id) AS advertiser_qty, 
     COUNT(DISTINCT id) AS contract_qty, 
     COUNT(DISTINCT advertiser_id , status = 1) AS current_qty, 
     SUM(IF(status = 2, 1, 0)) AS expired_qty, 
     SUM(IF(status = 3, 1, 0)) AS other_qty 
FROM (SELECT * 
     FROM `contracts` 
     GROUP BY advertiser_id, id) AS temp 

DEMO HERE