Using PostgreSQL & applicable to Oracle SQL, Microsoft SQL Server, and MySQL for Data, Apps and Web development.
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Using Real World PostgreSQL Database Airlines Database.
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Use SQL to create databases.
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Use SQL to Query & retrieve data from databases.
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Use SQL to Sort records after retrieving from databases.
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Use SQL to Filter data by using where clause.
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Use SQL to Group data by specific conditions.
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SQL Challenge to test what you are learning.