The entity integrity constraint states that primary key value can't be null. This is because the primary key value is used to identify individual rows in relation and if the primary key has a null value, then we can't identify those rows. A table can contain a null value other than the...
DBMS (Database Management System): A Database Management System, commonly referred to as DBMS, is a software software that permits the creation, employer, and control of databases. It provides a fixed set of equipment and capabilities to save, retrieve, alter, and delete information in an esta...
Example: suppose a company contains several employees in each department. Suppose we use a clustering index, where all employees which belong to the same Dept_ID are considered within a single cluster, and index pointers point to the cluster as a whole. Here Dept_Id is a non-unique key. T...
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Computer hardware didn't become strong enough to enable the widespread use of relational systems until the middle of the 1980s (DBMSs plus applications). But by the early 1990s, relational systems had taken over in all large-scale data processing applications, and they still did in 2018. The...
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Suppose a user executes a query. As we have learned that there are various methods of extracting the data from the database. In SQL, a user wants to fetch the records of the employees whose salary is greater than or equal to 10000. For doing this, the following query is undertaken: ...