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How do I modify a MySQL column to allow NULL?
MySQL 5.0.45
6 Answers
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Alter Table Add Column Syntax
I'm trying to programmatically add an identity column to a table Employees. Not sure what I'm doing wrong with my syntax.
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Difference between this and self in self-type annotations?
In various Scala literature I see some self-type annotations using "this" and others using "self":
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MFC的多国语言界面的实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
MFC的多国语言界面的实现目前很多软件都是要出口到多个国家，因此，为软件提供多国语言支持就成为了一个基本条件。为软件提供多国语言的支持的具体实现方法有很多，...目前很多软件都是要出口到多个国家，因此，为软件...
Differences between utf8 and latin1
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UTF-8 is prepared for world domination, Latin1 isn't.
If you're trying to store non-Latin characters like Chinese, Japanese, Hebrew, Russian, etc using Latin1 encoding, then they will end up as mojibake. You may find the introductory text of this articl...
Python: Using .format() on a Unicode-escaped string
I am using Python 2.6.5. My code requires the use of the "more than or equal to" sign. Here it goes:
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differences between 2 JUnit Assert classes
The JUnit framework contains 2 Assert classes (in different packages, obviously) and the methods on each appear to be very similar. Can anybody explain why this is?
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How do I set a column value to NULL in SQL Server Management Studio?
How do I clear the value from a cell and make it NULL?
6 Answers
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How do I convert an interval into a number of hours with postgres?
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Probably the easiest way is:
SELECT EXTRACT(epoch FROM my_interval)/3600
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How can I define a composite primary key in SQL?
How can I define a composite primary key consisting of two fields in SQL?
3 Answers
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