DB2 Interview Questions 1
Question: What is a DB2 bind?
Answer: A DB2 bind is a process that builds an access path to DB2 tables.
Question: What is a DB2 access path?
Answer: An access path is the method used to access data specified in DB2 sql statements.
Question: What is a DB2 plan?
Answer: An application plan or package is generated by the bind to define an access path.
Question: What is normalization and what are the five normal forms?
Answer: Normalization is a design procedure for representing data in tabular format.
The five normal forms are progressive rules to represent the data with minimal redundancy.
Question: What are foreign keys?
Answer: These are attributes of one table that have matching values in a primary key in another table,
allowing for relationships between tables.
Question: Describe the elements of the SELECT query syntax.
Answer: SELECT element FROM table WHERE conditional statement.
Question: Explain the use of the WHERE clause.
Answer: WHERE is used with a relational statement to isolate the object element or row.
Question: What techniques are used to retrieve data from more than one table in a single SQL statement?
Answer: Joins, unions and nested selects are used to retrieve data.
Question: What do the initials DDL and DML stand for and what is their meaning?
DDL is data definition language and DML is data manipulation language.
DDL statements are CREATE, ALTER, TRUNCATE.
DML statements are SELECT, INSERT, DELETE and UPDATE.
Question: What is a view and why do we use it?
Answer: A view is a virtual table made up of data from base tables and other views, but not stored separately.