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→Introducing Database Schema
== Introducing Database Schema ==
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Database Schema define the characteristics of the data stored in a database table. For example, the table schema for a customer database table might define that the customer name is a string of no more than 20 characters in length, and that the customer phone number is a numerical data field of a certain format.
Schema are also used to define the structure of entire databases and the relationship between the various tables contained in each database.
== Columns and Data Types ==
