大约有 15,000 项符合查询结果(耗时:0.0310秒) [XML]

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Can we pass parameters to a view in SQL?

...create a settings table in your database, with columns Id, Param1, Param2, etc. Insert a row into that table containing the values Id=1,Param1=0,Param2=0, etc. Then you can add a join to that table in your view to create the desired effect, and update the settings table before running the view. If y...
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T-SQL CASE Clause: How to specify WHEN NULL

... for null, and can be verified even in SQL Server by using case statements etc.) SELECT NULL = NULL -- Results in NULL SELECT NULL <> NULL -- Results in NULL So there is no true/false answer to the question, instead the answer is also null. This has many implications, for example in CAS...
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Android AlertDialog Single Button

...tDialog.Builder(this); builder.setMessage("Look at this dialog!") .setCancelable(false) .setPositiveButton("OK", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { //do things } }); AlertDialog aler...
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Detect the specific iPhone/iPod touch model [duplicate]

...iPhone4,1 iPad 2 is iPad2,1 iPad2,2 and iPad2,3 depending on version (GSM etc) iPad 3 is iPad3,1 iPad3,2 and iPad3,3 depending on version (GSM etc) See Iphone secrets (scroll down to "internal product codes") Another good source is: everyiphone.com ...
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Why does the month argument range from 0 to 11 in JavaScript's Date constructor?

... if we'd say January Five, January Sixth, instead of January 5, January 6, etc., then perhaps they'd have made a 0-based enumeration for days too... Perhaps subconsciously they thought about an enumeration for months as {January, February, ...} and for days as {One, Two, Three, ...}, except for day...
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Array Size (Length) in C#

...ress the . key it shows you a list of all the methods, properties, events, etc. available on that object. When you highlight a member it gives you a brief description of what it does. Press F1 If you find a method or property that might do what you want but you're not sure, you can move the curs...
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Cleaning up the iPhone simulator

...one app) All the notes from others apply about being a good upgradable app etc. (I personally found this useful nonetheless b/c I have development mode switches that reload a database in a specific state I was trying to do some consistent robustness/error handling on) ...
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How to check whether a string is a valid HTTP URL?

...and Uri.TryCreate methods, but they seem to return true for file paths etc. 9 Answers ...
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When should I use genetic algorithms as opposed to neural networks? [closed]

...Genetic algorithms (usually) work on discrete data (enums, integer ranges, etc.). A typical application for GAs is searching a discrete space for a "good enough" solution when the only available alternative is a brute-force search (evaluating all combinations). Neural networks, on the other hand, (...
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HTML img tag: title attribute vs. alt attribute?

...he page, including alt attributes from images; search engine optimization; etc. lots of good reasons not to assume 100% image display. – jwl May 16 '09 at 13:19 2 ...