SQL Server Developer Interview Questions and Answers for Freshers

Integrity constraints are rules that ensure data integrity and consistency in a database.

• Integrity constraints are used to enforce business rules and maintain data accuracy.

• Common types of integrity constraints include primary key, foreign key, unique key, and check constraints.

• For example, a primary key constraint ensures that each row in a table is uniquely identified by a specific column or combination of columns.

A stored procedure is a precompiled collection of SQL statements that can be executed by calling the procedure name.

• Stored procedures can accept input parameters and return output parameters.

• They can be used to encapsulate complex logic and improve performance by reducing network traffic.

• Stored procedures are stored in the database and can be reused by multiple applications or users.

• Example: CREATE PROCEDURE GetEmployeeDetails AS SELECT * FROM Employees WHERE Department = 'IT...read more

SQL commands are instructions used to interact with a database management system to perform tasks such as querying, updating, and managing data.

• SQL commands are used to perform various operations on a database, such as selecting data with SELECT, inserting data with INSERT, updating data with UPDATE, and deleting data with DELETE.

• Other common SQL commands include CREATE TABLE for creating tables, ALTER TABLE for modifying tables, and DROP TABLE for deleting tables.

• SQL command...read more

Different types of joins in SQL include inner join, left join, right join, and full outer join.

• Inner join: Returns rows when there is a match in both tables.

• Left join: Returns all rows from the left table and the matched rows from the right table.

• Right join: Returns all rows from the right table and the matched rows from the left table.

• Full outer join: Returns rows when there is a match in either table.