The SQL DATEDIFF function calculates and returns the difference between two date values. The value returned is an integer. You can use

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SQL DATEDIFF Function (Transact SQL)

The SQL CAST function converts an input expression of one data type into another data type.  Description Data types of values often

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SQL CAST Function (Transact SQL)

Database normalization is a process used to organize a database into tables and columns. There are three main forms: first normal form

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Database Normalization – in Easy to Understand English