Senior SQL Developer Interview Questions and Answers

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

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

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

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, ',')

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.