How do you specify multiple conditions in a WHERE clause?

Specifying multiple conditions in a WHERE clause is accomplished by using logical operators such as AND and OR. The AND operator allows you to filter records that satisfy both conditions, while the OR operator selects records that meet at least one of the specified conditions. This is crucial when you want to refine your dataset based on various criteria.

For instance, if you have a dataset of sales transactions and you want to find records where the sales amount is greater than $500 AND the transaction date falls within a particular month, you can combine these two conditions using the AND operator. Conversely, if you are interested in transactions that exceed $500 OR involve a credit card payment, you would utilize the OR operator.

Using AND and OR logically connects the different criteria and ultimately helps in narrowing down the dataset to meet specific analysis needs. Other options, such as separating conditions with commas, do not conform to the syntax of the WHERE clause in SAS and would result in errors. Numeric values on their own do not convey multiple conditions without the accompanying logical operators, and nested PROC statements are a different syntactical construct not relevant to the direct use of the WHERE clause.