Senior Database Developer

Senior Database Developer Interview Questions and Answers for Freshers

Updated 10 Jan 2023

Q1. What do you mean by cascade

Ans.

Cascade refers to the automatic propagation of changes made to a parent record to its related child records.

  • Cascade is a feature in database management systems that ensures data consistency and integrity.

  • It allows changes made to a parent record to be automatically reflected in its related child records.

  • For example, if a parent record is deleted, all its child records will also be deleted automatically.

  • Cascade can be set up for various types of actions, such as update, delete...read more

Q2. Difference between delete and truncate

Ans.

Delete removes specific rows while truncate removes all rows from a table.

  • Delete is a DML command while truncate is a DDL command.

  • Delete can be rolled back while truncate cannot be rolled back.

  • Delete is slower than truncate as it logs each row deletion while truncate does not.

  • Delete can have a WHERE clause to specify which rows to delete while truncate deletes all rows.

  • Delete does not reset the identity of the table while truncate resets the identity of the table.

  • Example: DEL...read more

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