Posted On: Feb 22, 2018
A query is basically a request for the database or the information associated with it in the combination of tables. A query associated with the database can either be a select or an action query.
A SQL query with the other significant query is called a subquery. We can also say it as a subset of all selected states where the values are used for the filtering the results of the main query.
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In order to remove the redundant data, normalization is used. It also reduces the null values and enables the efficiency of indexing...