Sql Aptitude Questions
Mastering SQL: Aptitude Questions Practice
Sql Aptitude Questions
SQL aptitude questions are designed to assess a candidate's knowledge and understanding of Structured Query Language (SQL), a standard programming language used for managing and manipulating data in relational databases. These questions typically cover a range of topics such as database concepts, table creation, data retrieval using queries, data manipulation (insert, update, delete), joins, subqueries, and aggregate functions. Candidates may be tested on their ability to write and optimize SQL queries, identify errors in given queries, and demonstrate proficiency in database management tasks. Practicing SQL aptitude questions can help candidates improve their problem-solving skills and prepare for database-related job roles.
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1 - What is SQL?
Structured Query Language (SQL) is a domain specific language used in programming and designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream management system (RDSMS).
2) What is a primary key in SQL?
A primary key is a unique identifier for each record in a database table. It ensures that each row in a table is uniquely identified and helps maintain data integrity and enforce entity integrity in a database.
3) What is the difference between SQL and MySQL?
SQL is a language used to query and manipulate data in relational databases, while MySQL is an open source relational database management system that uses SQL as its language for interacting with databases. MySQL is just one of many RDBMS that use SQL.
4) What is the purpose of the SQL SELECT statement?
The SELECT statement is used in SQL to retrieve data from one or more tables in a database. It allows you to specify the columns you want to retrieve, the tables you want to retrieve data from, and any conditions that must be met for the data to be included in the result set.
5) What is normalization in SQL?
Normalization is the process of organizing data in a database to minimize redundancy and dependency by dividing large tables into smaller tables and defining relationships between them. This helps reduce data duplication and ensures data integrity.
6) What is a foreign key in SQL?
A foreign key is a column or a set of columns in one table that references the primary key in another table. It establishes a link between the two tables and enforces referential integrity, ensuring that data remains consistent across the tables.
7) What is an SQL query?
An SQL query is a command used to retrieve data from a database or perform operations on the data, such as inserting, updating, or deleting records. It is written in SQL syntax and can be tailored to extract specific information based on the requirements.
8) What is a JOIN in SQL?
A JOIN is used in SQL to combine rows from two or more tables based on a related column between them. There are different types of JOINs, such as INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN, each serving a specific purpose in retrieving data from multiple tables.
9) What is the difference between SQL Server and Oracle?
SQL Server is a relational database management system developed by Microsoft, while Oracle is a relational database management system developed by Oracle Corporation. Both systems support SQL as a query language but have differences in terms of features, pricing, and performance.
10) What is a stored procedure in SQL?
A stored procedure is a set of SQL statements stored in the database catalog. It can be called and executed within the database, allowing for modular code execution, improved performance, and enhanced security by reducing the likelihood of SQL injection attacks.
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