從複雜的選擇創建視圖

Question

我有很複雜的查詢，我想創建一個視圖。查詢如下：

select s.avg as c3, fs.bayes, fs.sure, fs.visu, fs.fstd from 
(
SELECT AVG(q.c3), COUNT(q.c3), q.std 
FROM (
     SELECT std, c3, ROW_NUMBER() OVER (PARTITION BY std ORDER BY id) AS rn 
     FROM ssims 
     WHERE obraz = 'peppers2' and noisetype ='L' and data>'2009-12-23' and maska = 9 
     ) q 
WHERE rn <= 15 
GROUP BY 
     std 
     ) s 
,(
SELECT AVG(f.bayes) as bayes, AVG(f.sure) as sure, AVG(f.visu) as visu, COUNT(f.bayes) as fcount, f.std as fstd 
FROM (
     SELECT std, bayes, sure, visu, ROW_NUMBER() OVER (PARTITION BY std ORDER BY id) AS rn 
     FROM falki_ssim 
     WHERE obraz = 'peppers2' and noisetype ='L' 
     ) f 
WHERE rn <= 15 
GROUP BY 
     std 
     ) fs 
where s.std = fs.fstd 

它選擇我用指定參數測試的平均結果。此查詢的輸出返回10行（標準值從5到50與步驟5，所以5，10，15 ...）和5列：c3，bayes，當然，可視，std

但我想以便能夠更改兩個子查詢的obraz和noisetype字段。因此，在創建這樣的說法後，我希望能夠以這種方式選擇的結果：

select * from my_view where obraz='peppers2' and noisetype = 'L' 

怎麼辦呢？

Answer 1

我將不得不測試它以獲得確切的查詢權限，但基本想法是在您的選擇查詢和您的group by子句中包含obraz和noisetype。類似這樣的：

select s.obraz, s.noisetype, s.avg as c3, fs.bayes, fs.sure, fs.visu, fs.fstd from 
(
SELECT obraz, noisetype, AVG(q.c3), COUNT(q.c3), q.std 
FROM (
     SELECT obraz, noisetype, std, c3, ROW_NUMBER() OVER (PARTITION BY obraz, noisetype, std ORDER BY id) AS rn 
     FROM ssims 
     WHERE data>'2009-12-23' and maska = 9 
     ) q 
WHERE rn <= 15 
GROUP BY 
     obraz, noisetype, std 
     ) s 
,(
SELECT obraz, noisetype, AVG(f.bayes) as bayes, AVG(f.sure) as sure, AVG(f.visu) as visu, COUNT(f.bayes) as fcount, f.std as fstd 
FROM (
     SELECT obraz, noisetype, std, bayes, sure, visu, ROW_NUMBER() OVER (PARTITION BY obraz, noisetype, std ORDER BY id) AS rn 
     FROM falki_ssim 
     ) f 
WHERE rn <= 15 
GROUP BY 
     obraz, noisetype, std 
     ) fs 
where s.std = fs.fstd AND s.obraz = fs.obraz AND s.noisetype = fs.noisetype 

您還應該使用JOIN關鍵字來連接表。