6. Selection Criteria
WHERE • TOP • LIKE
Up until this point, the SELECT statements we’ve seen have always brought back every row in the table. This would rarely be the case in real-world situations. One is normally interested only in retrieving data that meets certain criteria. For example, if you’re selecting orders, you probably only want to see orders that meet certain conditions. When looking at products, you ordinarily only want to view certain types of products. Rarely does someone want to simply see everything. Your interest in data is typically directed toward a small subset of that data in order to analyze or view one particular aspect.
Applying Selection Criteria
Selection criteria in SQL begins with the WHERE ...