sql interview questions how to declare variable , assign, use in sql query #sqlbasics

#sqlbasics

sql interview questions how to declare variable , assign, use in sql query

In SQL, variable declaration involves specifying a name and data type. Assignment assigns a value to the declared variable, enabling storage and retrieval of data. Variables offer dynamic flexibility in queries, facilitating parameterized searches and calculations. Using variables enhances query efficiency, simplifies maintenance, and allows for adaptable code. They serve as placeholders, accommodating changing values during query execution, contributing to a more dynamic and reusable SQL code structure.

here is another SQL interview questions find the products and calculate the sum of sales of the last month
To find the products and calculate the sum of sales for the last month, review the sales records from the most recent month. Identify all products sold during that period and sum their corresponding sales figures to determine the total revenue generated.