Logical Query Processing

What Happens When a Query is Submitted? The main statement used to retrieve data in T-SQL is the SELECT statement. Following are the main query clauses specified in the order that you are supposed to type them (known as “keyed-in order”): SELECT FROM WHERE GROUP BY HAVING ORDER BY But there is a logical query processor … Continue reading Logical Query Processing

Structured Query Language

By a “set” we mean any collection M into a whole of definite, distinct objects m (which are called the “elements” of M) of our perception or of our thought. —George Cantor, in “Georg Cantor” by Joseph W. Dauben (Princeton University Press, 1990) Standard SQL is based on the relational model, which is a mathematical … Continue reading Structured Query Language