September 2004
Beginner to intermediate
388 pages
6h 34m
English
Content preview from PROC SQL: Beyond the Basics Using SAS®
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7.2. Introducing Complex Queries
In the previous chapters, the queries could be classified as being relatively simple because references were always made against a single table. We now turn our attention to queries of a more complex nature that call on the full features of the SQL procedure. Four complex query constructs will be illustrated in this chapter.
| Inner Joins | Up to 32 tables are referenced in a FROM and optional WHERE clause of a SELECT statement. |
| Outer Joins | A maximum of two tables are referenced in a FROM and ON clause of a SELECT statement. |
| Subqueries | A query is embedded (nested) in the WHERE clause of a main query. |
| Set Operations | A new results table is created from two separate queries. |
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