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Add primary key to existing table
I have an existing table called Persion . In this table I have 5 columns:
10 Answers
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Oracle “Partition By” Keyword
Can someone please explain what the partition by keyword does and give a simple example of it in action, as well as why one would want to use it? I have a SQL query written by someone else and I'm trying to figure out what it does.
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How to enumerate an enum with String type?
For example, how can I do something like:
42 Answers
42
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How do I handle too long index names in a Ruby on Rails ActiveRecord migration?
I am trying to add an unique index that gets created from the foreign keys of four associated tables:
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Why would an Enum implement an Interface?
I just found out that Java allows enums to implement an interface. What would be a good use case for that?
16 Answers
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Converting between java.time.LocalDateTime and java.util.Date
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Everything is here : http://blog.progs.be/542/date-to-java-time
The answer with "round-tripping" is not exact : when you do
LocalDateTime ldt = LocalDateTime.ofInstant(instant, ZoneOffset.UTC);
if your system timezone is not UTC/GMT, you cha...
How to get index using LINQ? [duplicate]
Given a datasource like that:
7 Answers
7
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Clone() vs Copy constructor- which is recommended in java [duplicate]
... //for all properties in FOo
f.set(foo.get());
return f;
}
Read more
http://adtmag.com/articles/2000/01/18/effective-javaeffective-cloning.aspx
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Variable number of arguments in C++?
How can I write a function that accepts a variable number of arguments? Is this possible, how?
17 Answers
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T-SQL stored procedure that accepts multiple Id values
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