Mysql 替换为按子查询排序

例如，从位于的数据库中（单击“运行SQL”），我想在所有来自美国的客户列表中，首先列出拥有大于80的最大CustomerID的客户

SELECT * FROM Customers
WHERE Country = 'USA'
ORDER BY CustomerID = (SELECT MAX(CustomerID) FROM Customers 
    WHERE CustomerID > 80 AND Country = 'USA') DESC, PostalCode;

但这不是我使用的真正的查询。如果选择。。。从…起哪里查询部分更复杂，什么是更优雅的查询

我试图修改的实际查询是

SELECT post.postid, post.visible, post.userid, post.parentid, post.vote_count
FROM " . TABLE_PREFIX . "post AS post
WHERE post.threadid = $threadid
AND post.visible IN (1" . (!empty($deljoin) ? ", 2" : "") . 
    ($show['approvepost'] ? ", 0" : "") . ")
ORDER BY post.postid = {$threadinfo['firstpostid']} DESC, post.vote_count > 5 DESC, 
    post.dateline $postorder

其中，

post.vote\u count>5 DESC

部分我试图仅替换为大于5的最大post.vote\u count。因此，我使用：

SELECT post.postid, post.visible, post.userid, post.parentid, post.vote_count
FROM " . TABLE_PREFIX . "post AS post
WHERE post.threadid = $threadid
AND post.visible IN (1" . (!empty($deljoin) ? ", 2" : "") . 
    ($show['approvepost'] ? ", 0" : "") . ")
ORDER BY post.postid = {$threadinfo['firstpostid']} DESC, post.vote_count = (
    SELECT MAX(post.vote_count)
    FROM " . TABLE_PREFIX . "post AS post
    WHERE post.threadid = $threadid
    AND post.visible IN (1" . (!empty($deljoin) ? ", 2" : "") . 
        ($show['approvepost'] ? ", 0" : "") . ")
    AND post.vote_count > 5
)
DESC, post.dateline $postorder

一切都很好。但您可以想象一个更复杂的查询，可能是带有内部联接的查询，它的SELECT。。。从…起哪里等必须在子查询中全部重复

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因此，我的问题是，我想，您是否可以对查询结果进行排序，以便第一项（在这些结果中）具有字段的最大值，其余项按其他方式排序，而不必在子查询中重写整个查询？

此查询将按CustomerID的降序列出数据

 SELECT * FROM Customers
    WHERE Country = 'USA'
    ORDER BY CustomerID  DESC, PostalCode;

---

此查询将按CustomerID的降序列出数据

 SELECT * FROM Customers
    WHERE Country = 'USA'
    ORDER BY CustomerID  DESC, PostalCode;

---

MySQL不支持CTE，CTE是简化查询的完美解决方案。但是，可以通过视图模拟它们：

CREATE VIEW c AS (SELECT Customer.* FROM Customer WHERE Country = "USA");
SELECT c.* FROM c ORDER BY CustomerID = (SELECT MAX(CustomerID) FROM c) DESC;
DROP VIEW c;

在您的情况下，这将提供：

CREATE VIEW p AS (
    SELECT post.postid, post.visible, post.userid, post.parentid, post.vote_count
    FROM " . TABLE_PREFIX . "post AS post
    WHERE post.threadid = $threadid
    AND post.visible IN (1" . (!empty($deljoin) ? ", 2" : "") . 
        ($show['approvepost'] ? ", 0" : "") . ")
);
SELECT p.* FROM p
ORDER BY p.postid = {$threadinfo['firstpostid']} DESC, p.vote_count = (
    SELECT MAX(p.vote_count)
    FROM p
    WHERE p.vote_count > 5
)
DESC, post.dateline $postorder;
DROP VIEW p;

---

MySQL不支持CTE，CTE是简化查询的完美解决方案。但是，可以通过视图模拟它们：

CREATE VIEW c AS (SELECT Customer.* FROM Customer WHERE Country = "USA");
SELECT c.* FROM c ORDER BY CustomerID = (SELECT MAX(CustomerID) FROM c) DESC;
DROP VIEW c;

在您的情况下，这将提供：

CREATE VIEW p AS (
    SELECT post.postid, post.visible, post.userid, post.parentid, post.vote_count
    FROM " . TABLE_PREFIX . "post AS post
    WHERE post.threadid = $threadid
    AND post.visible IN (1" . (!empty($deljoin) ? ", 2" : "") . 
        ($show['approvepost'] ? ", 0" : "") . ")
);
SELECT p.* FROM p
ORDER BY p.postid = {$threadinfo['firstpostid']} DESC, p.vote_count = (
    SELECT MAX(p.vote_count)
    FROM p
    WHERE p.vote_count > 5
)
DESC, post.dateline $postorder;
DROP VIEW p;

---

你的数据库有多大？查询并不太复杂，奇怪的是它需要很长时间。你能解释一下吗？@Benoit Garret很有道理。我希望能澄清我的问题。你的数据库有多大？查询并不太复杂，奇怪的是它需要很长时间。你能解释一下吗？@Benoit Garret很有道理。我希望能澄清我的问题，但这并不能回答问题。问题是关于使用筛选器列出，并将其插入另一个查询中。这并不能回答问题。问题是如何使用过滤器列出，并将其插入另一个查询中。