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How can I define a composite primary key in SQL?
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In Oracle database we can achieve like this.
CREATE TABLE Student(
StudentID Number(38, 0) not null,
DepartmentID Number(38, 0) not null,
PRIMARY KEY (StudentID, DepartmentID)
);
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In Maven 2, how do I know from which dependency comes a transitive dependency?
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Squash the first two commits in Git? [duplicate]
With git rebase --interactive <commit> you can squash any number of commits together into a single one.
9 Answers
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How do I convert from stringstream to string in C++?
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Difference between a user and a schema in Oracle?
...cally -- A schema is the set of metadata (data dictionary) used by the database,
typically generated using DDL. A schema defines attributes of the database, such as
tables, columns, and properties. A database schema is a description of the data in a
database.
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What's the state of the art in email validation for Rails?
...] || "is not an email")
end
end
end
class Person < ActiveRecord::Base
validates :email, presence: true, email: true
end
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how to make svn diff show only non-whitespace line changes between two revisions
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jQuery empty() vs remove()
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Inline instantiation of a constant List
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Drop a temporary table if it exists
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