FIS Implementation Analyst Interview Questions and Answers

Delete removes all rows from a table, while truncate removes all rows and resets auto-increment values.

• Delete is a DML command and can be rolled back, while truncate is a DDL command and cannot be rolled back.

• Delete triggers delete triggers and delete constraints, while truncate does not trigger any triggers or constraints.

• Delete is slower as it logs individual row deletions, while truncate is faster as it logs the dea...read more

Joins are used to combine rows from two or more tables based on a related column between them.

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• INNER JOIN returns rows when there is at least one match in both tables.

• LEFT JOIN returns all rows from the left table and the matched rows from the right table.

• RIGHT JOIN returns all rows from the right table and the matched rows from the left table.

• FULL ...read more

Views are virtual tables that display a subset of data from one or more tables in a database.

• Views are used to simplify complex queries by storing them as a virtual table.

• They can also restrict access to certain columns or rows of data.

• Views do not store data themselves, but instead display data from the underlying tables.

• Example: Creating a view that displays only the names and emails of customers from a database tabl