爲每列添加一行總計

我想將包含總和（或任何其他操作，如平均值，作爲最後一行）的SQL select查詢添加一行。在這裏它類似於GROUP BY ... WITH ROLLUP。爲每列添加一行總計

開始：比方說，我有一個表字段ID，A，B和C，所有這些都是數字。另外，ID不是唯一的，而是一個類別。我的SELECT查詢應該計算這些數字中有多少屬於指定的範圍。

因此，舉例來說，最終結果將是

(SELECT t.ID, a.ac, b.bc, c.cc FROM t 
LEFT JOIN (SELECT COUNT(*) cc,ID FROM t WHERE A BETWEEN 2 AND 4 GROUP BY ID) AS a ON a.ID=t.ID 
LEFT JOIN (SELECT AVG(B) cc,ID FROM t WHERE B BETWEEN 19 AND 40 GROUP BY ID) AS b ON b.ID=t.ID 
LEFT JOIN (SELECT COUNT(*) cc,ID FROM t WHERE C BETWEEN 12 AND 14 GROUP BY ID) AS c ON a.ID=t.ID GROUP BY t.ID) 

union 

(select 'Overall', 
(SELECT COUNT(*) cc FROM t WHERE A BETWEEN 2 AND 4), 
(SELECT AVG(B) cc FROM t WHERE B BETWEEN 19 AND 40), 
(SELECT COUNT(*) cc FROM t WHERE C BETWEEN 12 AND 14));

然而，該方案是不理想的，因爲我需要重新狀態的條件A，B和C.我想知道是否有簡單的方法來完成指定條件的同一個結果只有一次。

在此先感謝。

來源

2012-12-12 corrideat

我不認爲有一個更簡單的解決方案。不過，我會重寫你這樣的疑問：

SELECT 
    t.ID, 
    count(case when A between 2 and 4 then ID end), 
    AVG(case when B between 19 and 40 then B end), 
    COUNT(case when C between 12 and 14 then id end) 
FROM t 
GROUP BY ID 
UNION 
select 
    'Overall', 
    count(case when A between 2 and 4 then ID end), 
    AVG(case when B between 19 and 40 then B end), 
    COUNT(case when C between 12 and 14 then id end) 
FROM t

來源

2012-12-12 23:21:57 fthiella

+1，你可以在第二個整體查詢中做同樣的事情，如果你想使用它，[**這裏是一個demo **]（http://sqlfiddle.com/#!2/f7023/1）。 –

@MahmoudGamal謝謝:)我在看到你的評論之前編輯過，不是它與你的演示相同:) – fthiella

好了，不平均，你可以這樣做：

SELECT t.ID, 
     count(case when A between 2 and 4 then ID end), 
     AVG(case when B between 19 and 40 then B end), 
     COUNT(case when C between 12 and 14 then id end) 
FROM t 
GROUP BY ID with rollup

這也是我爲寫：

SELECT t.ID, 
     sum(case when A between 2 and 4 then 1 else 0 end), 
     sum(case when B between 19 and 40 then B end)/sum((case when B between 19 and 40 then B end), 
     sum(case when C between 12 and 14 then 1 else end) 
FROM t 
GROUP BY ID with rollup

我不知道如何彙總與平均值工作，所以最終版本是：

select coalesce(t.ID, 'Overall'), Acnt, 
     (case when Bcnt > 0 then Bsum/Bcnt end), 
     Ccnt 
from (select t.ID, 
      sum(case when A between 2 and 4 then 1 else 0 end) as Acnt, 
      sum(case when B between 19 and 40 then B end) as Bsum, 
      sum(case when B between 19 and 40 then B end) as Bcnt, 
      sum(case when C between 12 and 14 then 1 else end) as Ccnt 
     FROM t 
     GROUP BY ID with rollup 
    ) t

來源

2012-12-13 02:41:23

爲每列添加一行總計

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