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FAQs on NCERT Textbook: Querying and SQL Functions - Informatics Practices for Class 12 - Humanities/Arts
| 1. What is the importance of SQL in querying databases? |  |
Ans.SQL, or Structured Query Language, is essential for managing and manipulating relational databases. It allows users to perform various operations such as querying data, updating records, and managing database structures. Learning SQL equips individuals with the skills to extract meaningful information from large datasets, making it a valuable tool in fields such as data analysis, software development, and business intelligence.
| 2. What are some common SQL functions used in querying? | |
Ans.Some common SQL functions include COUNT(), SUM(), AVG(), MIN(), and MAX(). COUNT() is used to count the number of rows that match a specified condition, SUM() calculates the total of a numeric column, AVG() finds the average value of a numeric column, MIN() returns the smallest value, and MAX() returns the largest value. These functions help in summarizing and analyzing data efficiently.
| 3. How do you write a basic SQL query to retrieve data from a table? | |
Ans.To write a basic SQL query, you start with the SELECT statement followed by the columns you want to retrieve and the FROM clause specifying the table name. For example, to retrieve all columns from a table named 'students', you would write: SELECT * FROM students; This query fetches all records from the 'students' table.
| 4. What is the difference between INNER JOIN and LEFT JOIN in SQL? | |
Ans.INNER JOIN returns only the rows where there is a match in both joined tables. In contrast, LEFT JOIN returns all rows from the left table and the matched rows from the right table, filling in NULLs for any non-matching rows. This distinction is crucial when working with related data in multiple tables.
| 5. Can SQL be used for data manipulation as well as data querying? | |
Ans.Yes, SQL is not only used for querying data but also for data manipulation. It includes commands like INSERT, UPDATE, and DELETE, which allow users to add new records, modify existing records, and remove records from a database. This dual functionality makes SQL a comprehensive language for database management.
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