Module 13 (Introduction to SQL - Part 2).pdf
Module 13 (Introduction to SQL - Part 2).pdf
Module 13 (Introduction to SQL - Part 2).pdf
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The JOIN ClauseAlthough I am using the term “tables” here, youcan actually write SELECT (and other kinds ofqueries) with a JOIN that can reference not onlythe tables in your database, but other queries youhad already written.Thus, ever more complex relationships can beexpressed by creating cascading sets of queriesthat reference other existing queries, and so forth.