Senior SQL Developer

Senior SQL Developer Interview Questions and Answers

Updated 27 Jun 2024
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Q1. write an sp to with 5 input var and one output var,all int and display the max of input variables

Ans.

SP with 5 input and 1 output var, all int. Display max of input vars.

  • Create a stored procedure with 5 input parameters and 1 output parameter

  • Use the MAX function to find the maximum value among the input parameters

  • Assign the maximum value to the output parameter

  • Test the stored procedure with sample input values

Q2. write a job scheduler code to backup up database daily at a particular time

Ans.

Code to schedule daily database backup

  • Use SQL Server Agent to create a new job

  • Set the schedule to run daily at the desired time

  • Add a step to the job to backup the database

  • Specify the backup location and file name

  • Test the job to ensure it runs successfully

Q3. What are various ways for Database Optimization

Ans.

Various ways for Database Optimization include indexing, query optimization, normalization, and caching.

  • Indexing: Create indexes on columns frequently used in WHERE clauses to improve query performance.

  • Query Optimization: Use EXPLAIN to analyze query execution plans and optimize them for better performance.

  • Normalization: Organize data into normalized tables to reduce redundancy and improve data integrity.

  • Caching: Utilize caching mechanisms like memcached or Redis to store fre...read more

Q4. String split to convert single cell data to multiple rows

Ans.

Use SQL string functions to split single cell data into multiple rows

  • Use STRING_SPLIT function in SQL Server to split a string into rows based on a specified separator

  • Use CROSS APPLY to apply the STRING_SPLIT function to each row in the table

  • Example: SELECT value FROM table CROSS APPLY STRING_SPLIT(column_name, ',')

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Q5. Explain differences between RDBMS and DBMS

Ans.

RDBMS is a type of DBMS that stores data in a structured format using tables with relationships between them.

  • RDBMS enforces referential integrity through foreign keys, while DBMS does not.

  • RDBMS supports ACID properties (Atomicity, Consistency, Isolation, Durability) for transactions, while DBMS may not.

  • Examples of RDBMS include MySQL, Oracle, SQL Server. Examples of DBMS include Microsoft Access, SQLite.

Q6. Factorial without using stored procedure

Ans.

Factorial can be calculated using a loop in SQL without using a stored procedure.

  • Use a loop to multiply numbers from 1 to the given number.

  • Initialize a variable to store the result and update it in each iteration.

  • Handle edge cases like 0 and negative numbers.

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