从复杂的选择创建视图

Question

我有很复杂的查询，我想创建一个视图。查询如下：

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 

它选择我用指定参数测试的平均结果。此查询的输出返回10行（标准值从5到50与步骤5，所以5，10，15 ...）和5列：c3，bayes，当然，可视，std

但我想以便能够更改两个子查询的obraz和noisetype字段。因此，在创建这样的说法后，我希望能够以这种方式选择的结果：

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

怎么办呢？

Answer 1

我将不得不测试它以获得确切的查询权限，但基本想法是在您的选择查询和您的group by子句中包含obraz和noisetype。类似这样的：

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 

您还应该使用JOIN关键字来连接表。