大约有 48,000 项符合查询结果（耗时：0.0452秒） [XML]
Entity Framework and SQL Server View
...use it as key
Sum(Amount) as Amount
From OrderDetail
Group by CustomerId
Sql optimizer will not use index ix_customer and it will perform table scan on primary index, but if instead of:
Group by CustomerId
you use
Group by IsNull(CustomerId, -1)
it will make MS SQL (at...
SQL Server: Examples of PIVOTing String data
... MAX( CASE data WHEN 'Edit' THEN data ELSE '' END ) EditCol
FROM t
GROUP BY Action
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Use cases for NoSQL [closed]
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At this point is very simple to build dynamic queries with filtering and grouping, that well fit with this kind of application.
For example, using the Aggregation Framework:
$pipeline = [];
//filter by date
$pipeline[] = [ '$match' => [ 'created_at' => [ '$gte' => $starDate, '$lte' =&...
How to replace multiple substrings of a string?
...compile("|".join(rep.keys()))
text = pattern.sub(lambda m: rep[re.escape(m.group(0))], text)
For example:
>>> pattern.sub(lambda m: rep[re.escape(m.group(0))], "(condition1) and --condition2--")
'() and --text--'
...
Validating IPv4 addresses with regexp
...han with the end of line? Additionally here I've marked the non-capturing groups to avoid unwanted sub-matches. NB: This still doesn't take into account @dty's comment as I'm not familiar with that form of IP; though he's correct that it seems valid.
– JohnLBevan
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How do I run a Node.js application as its own process?
...r/www/myapp/app.js
Restart=always
User=nobody
# Note Debian/Ubuntu uses 'nogroup', RHEL/Fedora uses 'nobody'
Group=nobody
Environment=PATH=/usr/bin:/usr/local/bin
Environment=NODE_ENV=production
WorkingDirectory=/var/www/myapp
[Install]
WantedBy=multi-user.target
Note if you're new to Unix: /var/...
Iterating through a JSON object
...decode the data as utf8 then deal with it:
# example of json data object group with two values of key id
jsonstufftest = '{'group':{'id':'2','id':'3'}}
# always set your headers
headers = {'User-Agent': 'Moz & Woz'}
# the url you are trying to load and get json from
url = 'http://www.cooljso...
Is there an alternative to string.Replace that is case-insensitive?
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From MSDN
$0 - "Substitutes the last substring matched by group number number (decimal)."
In .NET Regular expressions group 0 is always the entire match. For a literal $ you need to
string value = Regex.Replace("%PolicyAmount%", "%PolicyAmount%", @"$$0", RegexOptions.IgnoreCase);
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Xcode Project vs. Xcode Workspace - Differences
... access the same source files as the app. All these related targets can be grouped in a project. While the project contains the files from all its targets, each target picks its own subset of relevant files. The same goes for build settings: You can define default project-wide settings in the projec...
MySQL DROP all tables, ignoring foreign keys
...p _tableName with a backquotes. Otherwise it will fail on some tables like group or other keywords.
– sashaaero
Dec 25 '19 at 11:54
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