#Basic sql injection test code#
Now, that you have understood how subqueries work, look at another advanced SQL topic.Ī stored procedure is an SQL code that you can save so that you can use the code over and over again. The following SQL query will show all the employees whose salary is greater than John’s salary, i.e. (select salary from employees where emp_name = 'John') Find all the employees whose salary is greater than John’s salary.Now, look at another example to understand the subqueries in SQL. The following SQL query shows the employee name, department, and salary columns of employees whose salary is greater than the average salary. In this scenario, you will use a subquery to get those employees whose salary is greater than the average salary from the employee table.įrom employees where salary > (select avg(salary) from employees) Find the employees whose salary is greater than the average salary.Look at this concept with the help of an example. Subqueries are a major part of Advanced SQL. The inner select query is usually used to determine the results of the outer select query. Subqueries in SQLĪ subquery is a select query that is enclosed inside another query. This demand has urged the SQL Developers to learn the Advanced SQL concepts. Industry leaders want and strive to make their companies be market leaders in their respective fields, so they want SQL Developers to extract more helpful information. The IT industry has seen an enormous demand for senior SQL Developers, over the years. Companies process massive amounts of data to keep extracting information for their business growth.
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