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William Sullivan

SQL Programming & Database Management For Absolute Beginners

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    ERD is the graphical representation of database scheme. ERD contains tables in the database, the columns within those tables and relationships between the tables.
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    SQL is a scripting language which means that SQL code is not required to be compiled before execution
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    Front end or commonly referred to as user interface and backend which consists of code that interact with the database.
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    Foreign Key

    Foreign keys are used to create relationship between two tables. Foreign key column contains values from the primary key column of some other table.
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    Primary Key

    Primary key is used to uniquely identify records within a table.
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    When an application is being executed, it stores data in RAM (Random Access Memory)
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    it stores data in RAM
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    will be executed or none will execute
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    set of queries in Boolean fashion.
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    UPDATE Examinations

    SET price = price * 1.1

    WHERE price < 250
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