Is using multiple tables an advisable solution to dealing with user defined fields?

I am looking at a problem which would involve users uploading lists of records with various field structures into an application. The 2nd part of this would be to also allow the users to specify 开发者

Replace & to & in URLs

I have TONS of XML Parsing Error: EntityRef: expecting \';\' errors on my page only because of the incorrect use ampersands in links by the developer.

关于banner的问题？

Does this program show the four card suits (♠♣♥♦) on all standard-ish systems?

The following shows ♠♣♥♦ on windows xp, will it for all systems?? #include <stdio.开发者_JS百科h>

Can Firefox code trigger any functions in the extension?

I have modified some code inside my Firefox. Just add on some extra functions for my isolation network. Besides that I also want to create my own FF extension for this particular purpose. I just need

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Selecting a specific Date Time from a datetime field in MySQL

How can this be done properly in MySQL? I want to select records that are created after a specific date AND time... I thought something simple like this would do 开发者_StackOverflow中文版the trick, b

Pythonic way to create a numpy array from a list of numpy arrays

I generate a list of one dimensional numpy arrays in a loop and later convert this list to a 2d numpy array. 开发者_开发百科I would\'ve preallocated a 2d numpy array if i knew the number of items ahea

Finding the correct scale value within a scaled object to maintain the aspect ratio of a video

Ihave a video inside of another movieclip. When I go full screen, I scale up the outer movieclip to fit the screen. So that OuterMovieClip.width is equal to screenWidth etc.How do I maintain the aspec

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