Which of the following is true about SQL?

SQL stands for Structured Query Language.

SQL is a programming language used for managing relational databases.

SQL can be used to retrieve, insert, update, and delete data from databases.

Consider the following SQL query: SELECT * FROM customers; What will be the output of this query?

All columns from the "customers" table

Error: Table "customers" doesn't exist

Only the first row from the "customers" table

Only the last row from the "customers" table

Consider the following SQL query: SELECT COUNT(*) FROM employees; What will be the output of this query?

Total number of employees in the "employees" table

Error: Table "employees" doesn't exist

Only the first row from the "employees" table

Only the last row from the "employees" table

Consider the following SQL query: SELECT name, age FROM students WHERE age > 20; What will be the output of this query?

All columns from the "students" table where age is greater than 20

Error: Table "students" doesn't exist

Only the first row from the "students" table where age is greater than 20

Only the last row from the "students" table where age is greater than 20

Consider the following SQL query: SELECT AVG(salary) FROM employees; What will be the output of this query?

Average salary of all employees in the "employees" table

Error: Table "employees" doesn't exist

Only the first row from the "employees" table

Only the last row from the "employees" table

Consider the following SQL query: SELECT MAX(price) FROM products; What will be the output of this query?

Maximum price from the "products" table

Error: Table "products" doesn't exist

Only the first row from the "products" table

Only the last row from the "products" table

Consider the following SQL query: SELECT name FROM employees WHERE age > 30; Which of the following indexes would be most beneficial for optimizing this query?

Composite index on both "name" and "age" columns

No index is needed for this query

Consider the following SQL query: SELECT COUNT(DISTINCT department) FROM employees; What will be the output of this query?

Number of distinct departments in the "employees" table

Error: Table "employees" doesn't exist

Only the first row from the "employees" table

Only the last row from the "employees" table

Consider the following SQL query: SELECT * FROM orders WHERE order_date BETWEEN '2022-01-01' AND '2022-12-31'; What will be the output of this query?

All orders from the "orders" table between the specified date range

Error: Table "orders" doesn't exist

Only the first row from the "orders" table

Only the last row from the "orders" table

Consider the following SQL query: SELECT COUNT(*) FROM products WHERE price > 100; What will be the output of this query?

Count of products in the "products" table where the price is greater than 100

Error: Table "products" doesn't exist

Only the first row from the "products" table

Only the last row from the "products" table

Consider the following SQL query: SELECT SUM(quantity) FROM orders WHERE product_id = 123; What will be the output of this query?

Sum of quantities for orders with product_id = 123

Error: Table "orders" doesn't exist

Only the first row from the "orders" table

Only the last row from the "orders" table

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