IDC Technologies SQL Developer Interview Questions and Answers

Learn basics of aptitude

Q1. Learn oops conceps and knowledge of coding in any language
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Q1. What are your strengths and weaknesses?
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Q2. Tell me about yourself.
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Q1. It was mainly java, interviewers are very good and supportive to elaborate more about problem.
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Q2. Scenario based on your earlier work experience
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Q1. How do you optimize Stored procedure
Ans. 
Optimizing stored procedures involves using proper indexing, reducing unnecessary loops, and minimizing database calls.
• Use proper indexing on columns used in WHERE clauses to improve query performance

• Avoid using cursors and loops whenever possible, as they can be inefficient

• Minimize the number of database calls by combining multiple queries into a single query or using temporary tables

• Consider using bulk processing tec...read more
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Q2. How do you optimize SQL query
Ans. 
Optimizing SQL queries involves using indexes, minimizing data retrieval, avoiding unnecessary joins, and optimizing query structure.
• Use indexes on columns frequently used in WHERE clauses

• Minimize data retrieval by selecting only necessary columns

• Avoid unnecessary joins by using EXISTS or IN clauses instead

• Optimize query structure by using appropriate join types and conditions
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Q3. What is use of returning clause
Ans. 
Returning clause is used to return a value from a function or procedure in PL/SQL.
• Used to return a single value from a function or procedure

• Can be used to return multiple values using OUT parameters

• Helps in passing values back to the calling program
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Q4. Disadvantages of triggers
Ans. 
Triggers can lead to performance issues, complexity, and potential for unintended consequences.
• Triggers can make code harder to debug and maintain

• They can lead to cascading effects if not carefully implemented

• Performance can be impacted if triggers are not optimized

• Triggers can introduce dependencies between different parts of the codebase
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Q1. Javascript question
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Q1. Core java, advanced java, spring boot, Hibernate, database
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Q2. Design pattern, previous project experience
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The interview will last for 30 minutes and will include basic Node.js questions, followed by two coding questions.

Q1. Tell me about your self
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Q2. About technical questions
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Q3. About current project
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