Constraints are some rules that enforce on the data to be enter into the database table. Basically constraints are used to restrict the type of data that can insert into a database table. Constraints can be defined in two ways:
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In well disposed bookmarking districts, discussion focuses are facilitated into express rooms or strings where clients follow content that is captivating to them. While following a piece of content, you'll get admonitions to your own feed when new information appears.
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