大约有 48,000 项符合查询结果（耗时：0.0831秒） [XML]
Find rows that have the same value on a column in MySQL
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This query will give you a list of email addresses and how many times they're used, with the most used addresses first.
SELECT email,
count(*) AS c
FROM TABLE
GROUP BY email
HAVING c > 1
ORDER BY c DESC
If you want the full rows:
select * from table where email ...
How to pass parameters on onChange of html select
I am a novice at JavaScript and jQuery. I want to show one combobox-A, which is an HTML <select> with its selected id and contents at the other place on onChange().
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PHP: Convert any string to UTF-8 without knowing the original character set, or at least try
I have an application that deals with clients from all over the world, and, naturally, I want everything going into my databases to be UTF-8 encoded.
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subtract two times in python
I have two datetime.time values, exit and enter and I want to do something like:
9 Answers
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What's a good way to extend Error in JavaScript?
I want to throw some things in my JS code and I want them to be instanceof Error, but I also want to have them be something else.
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What is the recommended approach towards multi-tenant databases in MongoDB?
...y tenants I'd have yet, but I would like to be able to scale into the thousands.
6 Answers
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Git format-patch to be svn compatible?
...ch with git diff --no-prefix master..branch > somefile.diff, the master and branch part are optional, depends how you want to get your diffs.
Send it wherever and apply with patch -p0 < somefile.diff.
It always seems to work fine for me and seems to be the simplest method that I've come acr...
How do I limit the number of returned items?
...t to sort(), which must be an array of constraints or just one constraint, and (2) execFind() is gone, and replaced with exec() instead. Therefore, with the mongoose 3.8.1 you'd do this:
var q = models.Post.find({published: true}).sort({'date': -1}).limit(20);
q.exec(function(err, posts) {
// ...
Is floating-point math consistent in C#? Can it be?
...//github.com/CodesInChaos/SoftFloat . Obviously it's still very incomplete and buggy.
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How can I remove specific rules from iptables?
I am hosting special HTTP and HTTPS services on the ports 8006 and 8007 respectively. I use iptables to "activate" the server; i.e. to route the incoming HTTP and HTTPS ports:
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