Web Reference: This tutorial introduces you to the most commonly used SQL data types including character string, numeric, and date time types. One of the key features of SQL language is its support for different data types, which allows developers to store and work with different kinds of data in a database. When creating tables or declaring variables in SQL, it’s important to specify the data type for each column or variable. An SQL developer must decide what type of data that will be stored inside each column when creating a table. The data type is a guideline for SQL to understand what type of data is expected inside of each column, and it also identifies how SQL will interact with the stored data.
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