Senior SQL Developer
Senior SQL Developer Interview Questions and Answers
Asked in WERTMARK TECHNOLOGIES
Q. Write a stored procedure with 5 integer input variables and one integer output variable to display the maximum of the input variables.
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
Asked in Pmam It Services
Q. What is performance tuning, and what are its key components?
Performance tuning optimizes SQL queries and database operations for improved efficiency and speed.
Indexing: Create indexes on frequently queried columns to speed up data retrieval. Example: Using an index on a 'customer_id' column.
Query Optimization: Rewrite complex queries to reduce execution time. Example: Replacing subqueries with JOINs.
Database Configuration: Adjust server settings like memory allocation and connection limits to enhance performance.
Statistics Maintenance...read more
Asked in WERTMARK TECHNOLOGIES
Q. Write a job scheduler code to back up the database daily at a particular time.
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
Asked in Navaratan Technologies
Q. What are the various ways for database optimization?
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
Asked in Healthcius
Q. How do you split a string to convert single cell data to multiple rows?
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, ',')
Asked in Navaratan Technologies
Q. Explain the differences between RDBMS and DBMS.
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.
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Asked in Healthcius
Q. Write a SQL query to calculate the factorial of a number without using a stored procedure.
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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