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Can table columns with a Foreign Key be NULL?
...the constraint only when the value is not NULL. This can be easily tested with the following example:
CREATE DATABASE t;
USE t;
CREATE TABLE parent (id INT NOT NULL,
PRIMARY KEY (id)
) ENGINE=INNODB;
CREATE TABLE child (id INT NULL,
parent_id INT NULL,
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Resizing UITableView to fit content
...ave a question in a UILabel and a multiple choice answers displayed in UITableView , each row showing a multiple choice. Questions and answers will vary, so I need this UITableView to be dynamic in height.
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What is a “translation unit” in C++
I am reading at the time the "Effective C++" written by Meyers
and came across the term "translation unit".
11 Answers
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How do I change selected value of select2 dropdown with JqGrid?
I'm using Oleg's select2 demo , but I am wondering whether it would be possible to change the currently selected value in the dropdown menu.
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How to cancel/abort jQuery AJAX request?
...process the request even if we abort the request but the client will not wait for/handle the response.
The xhr object also contains a readyState which contains the state of the request(UNSENT-0, OPENED-1, HEADERS_RECEIVED-2, LOADING-3 and DONE-4). we can use this to check whether the previous reque...
Convert HTML to NSAttributedString in iOS
I am using a instance of UIWebView to process some text and color it correctly, it gives the result as HTML but rather than displaying it in the UIWebView I want to display it using Core Text with a NSAttributedString .
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Read/Write 'Extended' file properties (C#)
I'm trying to find out how to read/write to the extended file properties in C#
e.g. Comment, Bit Rate, Date Accessed, Category etc that you can see in Windows explorer.
Any ideas how to do this?
EDIT: I'll mainly be reading/writing to video files (AVI/DIVX/...)
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Filter dataframe rows if value in column is in a set list of values [duplicate]
...follow
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edited Feb 25 at 0:45
Harvey
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Why can't variable names start with numbers?
I was working with a new C++ developer a while back when he asked the question: "Why can't variable names start with numbers?"
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How to secure MongoDB with username and password
... ask for the user name & password. I tried the tutorial from the MongoDB site and did following:
15 Answers
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