blocks|key|4235675|text|您现有的查询不会执行您想要的操作。相反，您需要在一些公共列上对表执行JOIN操作：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4235676|SELECT
++posts.*,
++comments.*,
++photos.*
FROM+
++posts+JOIN+comments+ON+posts.post_id+=+comments.post_id
++JOIN+photos+ON+posts.post_id+=+photos.post_id
ORDER+BY+posts.date+DESC|code-block|syntax|javascript|4235677|请注意，通常不建议在生产代码中使用SELECT+*或SELECT+posts.*。通常，更好的方法是显式列出所需的列，这样就可以确定它们到达的顺序(例如，这对于UNION查询很重要)，并且可以确定您的模式是否发生了变化。|4235678|SELECT
++posts.date,
++posts.post_id,
++posts.title,
++posts.etc,
++comments.date,
++comments.user,
++comments.text,
++photos.title
FROM
++posts+JOIN+comments+ON+posts.post_id+=+comments.post_id
++JOIN+photos+ON+posts.post_id+=+photos.post_id

/*+Also,+if+multiple+tables+have+a+`date`+column,+you'll+need+to+specify+which+one
+++as+in+`posts`.`date`+*/
ORDER+BY+posts.date+DESC|4235679|entityMap^0|Y|4|0|0|H|8|Q|E|28|5|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|P|$]]

Your existing query won't do what you want. Instead you need to <code>JOIN</code> your tables on some common column:

<pre><code>SELECT
 posts.*,
 comments.*,
 photos.*
FROM 
 posts JOIN comments ON posts.post_id = comments.post_id
 JOIN photos ON posts.post_id = photos.post_id
ORDER BY posts.date DESC
</code></pre>

Note that it is often not advisable to do <code>SELECT *</code> or <code>SELECT posts.*</code> in production code. It is typically better to explicitly list the columns you want so you can be sure of the order they arrive in (which matters for <code>UNION</code> queries, for example), and if your schema changes.

<pre><code>SELECT
 posts.date,
 posts.post_id,
 posts.title,
 posts.etc,
 comments.date,
 comments.user,
 comments.text,
 photos.title
FROM
 posts JOIN comments ON posts.post_id = comments.post_id
 JOIN photos ON posts.post_id = photos.post_id

/* Also, if multiple tables have a `date` column, you'll need to specify which one
 as in `posts`.`date` */
ORDER BY posts.date DESC
</code></pre>

blocks|key|4235681|text|SELECT+*
FROM+(SELECT+userID,+Col1,+Col2,+Col3,+date
++++++FROM+posts
++++++UNION
++++++SELECT+userID,+Col1,+Col2,+Col3,+date
++++++FROM+comments
++++++SELECT+userID,+Col1,+Col2,+Col3,+date
++++++FROM+photos+)+t
WHERE+userID+=+123
ORDER+BY+date+DESC|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4235682|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>SELECT *
FROM (SELECT userID, Col1, Col2, Col3, date
 FROM posts
 UNION
 SELECT userID, Col1, Col2, Col3, date
 FROM comments
 SELECT userID, Col1, Col2, Col3, date
 FROM photos ) t
WHERE userID = 123
ORDER BY date DESC
</code></pre>

blocks|key|329445|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|329446|若要使用ORDER+BY或LIMIT子句对整个UNION结果进行排序或限制，请将各个SELECT语句括起来，并将ORDER+BY或limit置于最后一个语句之后。下面的示例使用这两个子句：|blockquote|329447|329448|329449|(SELECT+a+FROM+t1+WHERE+a=10+AND+B=1)+UNION+
(SELECT+a+FROM+t2+WHERE+a=11+AND+B=2)+
ORDER+BY+a+LIMIT+10;|code-block|syntax|javascript|329450|329451|不带括号的语句等同于刚才显示的带括号的语句。|329452|329453|这种ORDER+BY不能使用包含表名(即tbl_name.col_name格式的名称)的列引用。相反，应在第一个SELECT语句中提供列别名，并在ORDER+BY中引用该别名。(或者，通过使用其列位置按顺序引用该列。但是，不推荐使用列位置。)|329454|329455|->+http://dev.mysql.com/doc/refman/5.0/en/union.html|offset|length|329456|entityMap|0|LINK|mutability|MUTABLE|url|http://dev.mysql.com/doc/refman/5.0/en/union.html^0|0|0|0|0|0|0|0|0|0|0|3|1D|0|0^^$0|@$1|2|3|-4|4|5|6|13|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|14|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|15|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|16|7|@]|8|@]|9|$]]|$1|F|3|G|4|H|6|17|7|@]|8|@]|9|$I|J]]|$1|K|3|-4|4|5|6|18|7|@]|8|@]|9|$]]|$1|L|3|M|4|C|6|19|7|@]|8|@]|9|$]]|$1|N|3|-4|4|5|6|1A|7|@]|8|@]|9|$]]|$1|O|3|P|4|5|6|1B|7|@]|8|@]|9|$]]|$1|Q|3|-4|4|5|6|1C|7|@]|8|@]|9|$]]|$1|R|3|S|4|5|6|1D|7|@]|8|@$T|1E|U|1F|1|1G]]|9|$]]|$1|V|3|-4|4|5|6|1H|7|@]|8|@]|9|$]]]|W|$X|$4|Y|Z|10|9|$11|12]]]]

<blockquote>
 To use an ORDER BY or LIMIT clause to sort or limit the entire UNION
 result, parenthesize the individual SELECT statements and place the
 ORDER BY or LIMIT after the last one. The following example uses both
 clauses:
</blockquote>

<pre><code>(SELECT a FROM t1 WHERE a=10 AND B=1) UNION 
(SELECT a FROM t2 WHERE a=11 AND B=2) 
ORDER BY a LIMIT 10;
</code></pre>

<blockquote>
 A statement without parentheses is equivalent to one parenthesized as
 just shown.
 
 This kind of ORDER BY cannot use column references that include a
 table name (that is, names in tbl_name.col_name format). Instead,
 provide a column alias in the first SELECT statement and refer to the
 alias in the ORDER BY. (Alternatively, refer to the column in the
 ORDER BY using its column position. However, use of column positions
 is deprecated.)
</blockquote>

-> <a href="http://dev.mysql.com/doc/refman/5.0/en/union.html" rel="nofollow">http://dev.mysql.com/doc/refman/5.0/en/union.html</a>

What's a good and simple way to select from multiple tables and just order everything by date, newest to oldest?

<pre><code> mysql_query("
 SELECT * 
 FROM posts, comments, photos 
 WHERE userID='$session' 
 ORDER BY date");
</code></pre>

if I wanted to do something like that.

mysql query select from multiple, order by date

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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从多个表中选择并按日期从最新到最旧排序的简单好方法是什么？ mysql_query("               SELECT *                FROM posts, comments, photos                WHERE userID='$session'           ...

问mysql查询select from multiple，order by date
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问mysql查询select from multiple，order by dateEN