Basic sql introduction pdf

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A table is a collection of related data entries and it consists of columns and rows. Every table is broken up into smaller entities called fields. A field is a column in a table that is designed to maintain specific information about every record in the table. A record, also called a row, is each individual entry that exists in a table. For example, there are 91 records in the above Customers table. A record is a horizontal entity in a table.