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Interacting with Database:Basic Queries in SQL Video Lecture | SSC CGL Tier 2 - Study Material, Online Tests, Previous Year

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FAQs on Interacting with Database:Basic Queries in SQL Video Lecture - SSC CGL Tier 2 - Study Material, Online Tests, Previous Year

1. What is SQL and how is it used in interacting with databases?
Ans. SQL stands for Structured Query Language and it is a programming language used for managing and interacting with databases. It allows users to retrieve, manipulate, and update data stored in a database. SQL is used to perform various operations such as creating tables, inserting data, updating records, and executing complex queries to retrieve specific information from the database.
2. How can I retrieve data from a database using SQL?
Ans. To retrieve data from a database using SQL, you can use the SELECT statement. This statement allows you to specify the columns you want to retrieve data from and the table you want to retrieve data from. You can also use various clauses like WHERE, ORDER BY, and GROUP BY to filter and sort the retrieved data based on specific conditions. For example, the query "SELECT * FROM customers" retrieves all the data from the "customers" table.
3. What are the different types of SQL queries?
Ans. There are several types of SQL queries: - SELECT: Retrieves data from one or more tables. - INSERT: Inserts new data into a table. - UPDATE: Modifies existing data in a table. - DELETE: Deletes data from a table. - CREATE: Creates a new table, view, or other database object. - ALTER: Modifies the structure of a table or other database object. - DROP: Deletes a table, view, or other database object. - JOIN: Combines rows from two or more tables based on a related column.
4. How can I filter data in SQL queries?
Ans. In SQL, you can use the WHERE clause to filter data in queries. The WHERE clause allows you to specify conditions that the retrieved data must meet. For example, the query "SELECT * FROM customers WHERE age > 25" retrieves all the customers whose age is greater than 25. You can use various operators such as "=", "<", ">", "<=", ">=", and "!=" to compare values in the WHERE clause.
5. Can I perform calculations in SQL queries?
Ans. Yes, you can perform calculations in SQL queries using mathematical operators and functions. For example, you can use the "+" operator to add values, the "-" operator to subtract values, the "*" operator to multiply values, and the "/" operator to divide values. Additionally, SQL provides various built-in functions such as SUM, AVG, COUNT, and MAX that allow you to perform calculations on specific columns or groups of data. These calculations can be used to derive insights and generate reports from the data stored in the database.
1375 videos|1309 docs|994 tests

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Interacting with Database:Basic Queries in SQL Video Lecture | SSC CGL Tier 2 - Study Material

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Interacting with Database:Basic Queries in SQL Video Lecture | SSC CGL Tier 2 - Study Material

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Interacting with Database:Basic Queries in SQL Video Lecture | SSC CGL Tier 2 - Study Material

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