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Using Joins

Using Joins

  • You must specify the join condition

    • Can be specified in the WHERE clause

    SELECT doc.title, dt.doc_type

    FROM documents doc, doctype dt

    WHERE doc.doc_type_id = dt.type_id

    • Can be spcified in the FROM clause (ANSISQL Standard)

    SELECT doc.title, dt.doc_type

    FROM documents doc JOIN doctype dt

    ON (doc.doc_type_id = dt.type_id)

  • JOIN sytax is similar in most databases but can vary

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