What is a join?

COBOL SQL Interview Questions

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What is a join?

A join is a relational operation that allows retrieval of data from two or more tables based on matching columns values.

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Other Interview Questions

• When do you use a LINK statement ?
• What is a synonym? How is it used
• What is the use of VALUE function?
• What is a subselect? It is different from a nested select ?
• What is normalization and what are the five normal forms?
• Can one add columns to a table after it has been defined?
• Explain an outer join ?
• What is the difference between static and dynamic SQL?
• What is a NULL value? What are the pros and cons of using NULLS ?
• What is the meaning of underscore ...
• More...