sql multiple where

Using multiple WHERE clauses in a SQL query is a powerful technique for refining your data selection. Instead of applying a single filter, you can combine multiple conditions to isolate precisely the data you need. This is particularly useful when you need to meet several criteria simultaneously. For example, you might want to find all customers who live in a specific city *and* have placed orders over a certain amount. Each WHERE clause acts as a filter, and the results are combined. The order of the clauses is important, as the database processes them sequentially. This means that the conditions in the first WHERE clause are applied before the conditions in the subsequent clauses.Imagine you have a table called 'Orders' with columns like 'CustomerID', 'OrderDate', 'TotalAmount', and 'Region'. You could use multiple WHERE clauses to find all orders placed in the 'North' region and with a total amount greater than $100. This ensures that you only retrieve orders that meet both criteria.Multiple WHERE clauses are especially useful in complex queries that need to filter data based on multiple criteria. They allow for more precise and targeted data retrieval, which is essential for data analysis and reporting. The flexibility of combining multiple conditions makes it a fundamental skill for any SQL developer.