In this chapter, you learn what stored procedures are, why they are used, and how they are used. You also look at the basic syntax for creating and using them.
Most of the SQL statements that we’ve used thus far are simple in that they use a single statement against one or more tables. Not all operations are that simple—often, multiple statements are needed to perform a complete operation. For example, consider the following scenario:
• To process an order, checks must be made to ensure that items are in stock.
• If items are in stock, they need to be reserved so they are not sold to anyone else, and the available quantity must be reduced to reflect the correct amount in stock. ...