TCS SQL Developer Interview Questions and Answers

Q1. Explain sql commands
Ans. 
SQL commands are instructions used to interact with a database to perform tasks such as querying, updating, and managing data.
• SQL commands are used to interact with databases to perform tasks like querying data, updating data, and managing database structures.

• Common SQL commands include SELECT, INSERT, UPDATE, DELETE, CREATE, and DROP.

• Examples: SELECT * FROM table_name; INSERT INTO table_name (column1, column2) VALUES ...read more
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Q2. Explain normalization in sql
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Normalization in SQL is the process of organizing data in a database to reduce redundancy and improve data integrity.
• Normalization involves breaking down a database into smaller, more manageable tables.

• It helps in reducing data redundancy by storing data in a structured way.

• Normalization ensures data integrity by minimizing the chances of inconsistencies.

• There are different normal forms like 1NF, 2NF, 3NF, etc. to guid...read more
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Q1. Project in SQL developer
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A project in SQL developer involves designing, implementing, and maintaining databases for various applications.
• Understand project requirements and design database schema accordingly

• Write efficient SQL queries to retrieve and manipulate data

• Optimize database performance by indexing, normalization, and query tuning

• Collaborate with developers and stakeholders to ensure database meets project needs
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Q2. Types of sql, explain briefly
Ans. 
Types of SQL include DDL, DML, DCL, and TCL.
• DDL (Data Definition Language) - used to define the structure of database objects (CREATE, ALTER, DROP)

• DML (Data Manipulation Language) - used to manipulate data in database objects (SELECT, INSERT, UPDATE, DELETE)

• DCL (Data Control Language) - used to control access to data (GRANT, REVOKE)

• TCL (Transaction Control Language) - used to manage transactions (COMMIT, ROLLBACK)
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Q1. What is sql?
Ans. 
SQL (Structured Query Language) is a standard programming language for managing and manipulating relational databases.
• SQL is used to perform tasks such as querying data, updating records, and managing database structures.

• Common SQL commands include SELECT (to retrieve data), INSERT (to add data), UPDATE (to modify data), and DELETE (to remove data).

• Example: SELECT * FROM employees WHERE department = 'Sales'; retrieves ...read more
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Q2. Types of joins?
Ans. 
Joins in SQL combine rows from two or more tables based on related columns.
• INNER JOIN: Returns records with matching values in both tables. Example: SELECT * FROM A INNER JOIN B ON A.id = B.id;

• LEFT JOIN: Returns all records from the left table and matched records from the right table. Example: SELECT * FROM A LEFT JOIN B ON A.id = B.id;

• RIGHT JOIN: Returns all records from the right table and matched records from the le...read more
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Q1. What is select statment
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A SELECT statement is used in SQL to query and retrieve data from a database table.
• The basic syntax is: SELECT column1, column2 FROM table_name;

• To select all columns: SELECT * FROM table_name;

• You can filter results using WHERE: SELECT * FROM table_name WHERE condition;

• To sort results, use ORDER BY: SELECT * FROM table_name ORDER BY column_name ASC|DESC;

• You can also use aggregate functions: SELECT COUNT(*), AVG(column_n...read more
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Q2. What are cursor
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Cursors are database objects used to retrieve, manipulate, and navigate through a result set row by row.
• Cursors allow for row-by-row processing of SQL query results.

• Types of cursors: implicit (automatically created) and explicit (defined by the user).

• Example of an explicit cursor: DECLARE cursor_name CURSOR FOR SELECT * FROM table_name;

• Cursors can be used in stored procedures and functions for complex data manipulation...read more
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