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Explain Instance and schemas?
Instances and schemas: Databases changes over time as the information is deleted and inserted. The collection of information stored in database at a particular moment in time is known as Instances and the whole design of database is known as schemas.
how many types of data model in DBMS? explain data abstraction with its different level
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how draw er diagram
Have database built but having problems with some questions that go with the database
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Using Literal Character String Example: To print IS A as one string with column name employee SELECT ENAME || ' IS A ' || JOB AS "EMPLOYEE" FROM EMP;
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Write a query that display ename annual salary and comm from emp table
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