大约有 48,000 项符合查询结果（耗时：0.0730秒） [XML]
must appear in the GROUP BY clause or be used in an aggregate function
...
To workaround this issue, you must calculate the aggregate in a sub-query and then join it with itself to get the additional columns you'd need to show:
SELECT m.cname, m.wmname, t.mx
FROM (
SELECT cname, MAX(avg) AS mx
FROM makerar
GROUP BY cname
) t JOIN makerar m ON m.cname = t....
Renaming or copying files and folder using NERDTree on Vim. Is it possible?
I checked the documentation and I couldn't find a way o renaming or copying files and folder using NERDTree. Is it possible?
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Difference between database and schema
What's the difference between a Database and a Schema in SQL Server? Both are the containers of tables and data.
5 Answers
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JavaScript data grid for millions of rows [closed]
...s set to the total height of all the rows. The rows are still being added and removed as the user is scrolling, but the scrolling itself is done by the browser. That allows it to be very fast yet smooth (onscroll events are notoriously slow). The caveat is that there are bugs/limits in the browse...
JavaScript - onClick to get the ID of the clicked button
...l reference exception using JQuery's event.target.id (for me, both Firefox and IE were throwing it), this is a great solution that works in all three major browsers.
– X3074861X
Aug 8 '13 at 16:30
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How can I increment a char?
I'm new to Python, coming from Java and C. How can I increment a char? In Java or C, chars and ints are practically interchangeable, and in certain loops, it's very useful to me to be able to do increment chars, and index arrays by chars.
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client secret in OAuth 2.0
...e google drive api, I have to play with the authentication using OAuth2.0. And I got a few question about this.
3 Answers
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MongoDB and “joins” [duplicate]
...ll only be evaluated when needed. A join (in a SQL database) on the other hand will resolve relationships and return them as if they were a single table (you "join two tables into one").
You can read more about DBRef here:
http://docs.mongodb.org/manual/applications/database-references/
There are ...
Can JSON start with “[”?
... read on json.org , all JSON strings should start with { (curly brace), and [ characters (square brackets) represent an array element in JSON.
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How to get number of rows using SqlDataReader in C#
...defined except for one that states to do a while loop with Read() method and increment a counter.
6 Answers
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