大约有 16,000 项符合查询结果（耗时：0.0267秒） [XML]
SQL update query using joins
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Excellent, the use of the CTE makes it simple to convert the original SELECT into an UPDATE
– SteveC
Jun 14 '13 at 14:48
4
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How can I check whether a option already exist in select by JQuery
...n there, instead of producing the 0 or 1 like the other does and having to convert it. I say both approaches are fine because you have to do 2 steps, either way. This seems more visible to the process, to me, and less prone to error by not judging the length of whitespace, for instance, like .leng...
Echo equivalent in PowerShell for script testing
...ut-String, because with any non-trivial object, you'll need to use that to convert the object to a display-able string before using any of those three Write-* cmdlets.
– Jaykul
Nov 2 '09 at 7:11
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Split an NSString to access one particular piece
...0]
Although note that it gives you an array of Substring. If you need to convert these back to ordinary strings, use map
let strings = "10/04/2011".split(separator: "/").map{ String($0) }
let firstBit = strings[0]
or
let firstBit = String(substrings[0])
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How can I implode an array while skipping empty array items?
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If no callback is supplied, all entries of input equal to FALSE (see converting to boolean) will be removed.
implode('-', array_filter($array));
Obviously this will not work if you have 0 (or any other value that evaluates to false) in your array and you want to keep it. But then you can ...
Extracting specific columns in numpy array
... instead an array containing the elements of the column you extracted.
To convert it to Matrix the reshape(M,1) method should be used on the resulting array.
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When and why will a compiler initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete?
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It is used to detect writing through dangling pointers.
0xED or Aligned Fence 'No man's land' for aligned allocations. Using a
0xBD different value here than 0xFD allows the runtime
to detect not only writing outside the a...
Database design for audit logging
...ed and by whom.
Here's a simple example:
CREATE TABLE dbo.Page(
ID int PRIMARY KEY,
Name nvarchar(200) NOT NULL,
CreatedByName nvarchar(100) NOT NULL,
CurrentRevision int NOT NULL,
CreatedDateTime datetime NOT NULL
And the contents:
CREATE TABLE dbo.PageContent(
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MySQL Error 1215: Cannot add foreign key constraint
...ents_has_Staff.Staff_Emp_ID.
Perhaps the columns in the parent tables are INT UNSIGNED?
They need to be exactly the same data type in both tables.
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Restful API service
... use case of getting some data from a RESTful Web Service, you should look into ResultReceiver and IntentService.
This Service + ResultReceiver pattern works by starting or binding to the service with startService() when you want to do some action. You can specify the operation to perform and pass...