Variables

System Aspects of SQL

We now consider the question of how SQL fits into a complete programming environment. In "SQL in a Programming Environment" we see how to embed SQL in programs that are written in an ordinary programming language, such as C. A critical issue is how we move data

Queries in PSM

There are many ways that select-from-where queries are used in PSM. 1. Subqueries can be used in conditions, or in general, any place a subquery is legal in SQL. We saw two examples of subqueries in lines (3) and (6) of "Branching Statements" Figure 2, for instance.

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