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  2. Join (SQL) - Wikipedia

    en.wikipedia.org/wiki/Join_(SQL)

    An inner join (or join) requires each row in the two joined tables to have matching column values, and is a commonly used join operation in applications but should not be assumed to be the best choice in all situations. Inner join creates a new result table by combining column values of two tables (A and B) based upon the join-predicate.

  3. Relational algebra - Wikipedia

    en.wikipedia.org/wiki/Relational_algebra

    The right outer join of relations R and S is written as R S. [e] The result of the right outer join is the set of all combinations of tuples in R and S that are equal on their common attribute names, in addition to tuples in S that have no matching tuples in R. [citation needed] For example, consider the tables Employee and Dept and their right ...

  4. Merge (SQL) - Wikipedia

    en.wikipedia.org/wiki/Merge_(SQL)

    A right join is employed over the Target (the INTO table) and the Source (the USING table / view / sub-query)--where Target is the left table and Source is the right one. The four possible combinations yield these rules:

  5. Many-to-many (data model) - Wikipedia

    en.wikipedia.org/wiki/Many-to-many_(data_model)

    For example, think of A as Authors, and B as Books. An Author can write several Books, and a Book can be written by several Authors. In a relational database management system, such relationships are usually implemented by means of an associative table (also known as join table, junction table or cross-reference table), say, AB with two one-to-many relationships A → AB and B → AB.

  6. Colon cancer: Measuring ‘biological age’ may help predict who ...

    www.aol.com/lifestyle/colon-cancer-measuring...

    One’s biological age, which measures the body’s physiological state, may help predict who is at risk for developing colon polyps, a known risk factor for colorectal cancer.

  7. Trump should be active on UN rights body to counter ... - AOL

    www.aol.com/news/trump-active-un-rights-body...

    GENEVA (Reuters) -A U.S. envoy told Reuters that U.S. President-elect Donald Trump's team should stay active at the United Nations Human Rights Council, partly to counter what she described as ...

  8. Relational database - Wikipedia

    en.wikipedia.org/wiki/Relational_database

    The join operation defined for relational databases is often referred to as a natural join (⋈). In this type of join, two relations are connected by their common attributes. MySQL's approximation of a natural join is the Inner join operator. In SQL, an INNER JOIN prevents a cartesian product from occurring when there are two tables in a query.

  9. Study Finds Changes in Cholesterol May Indicate Higher ...

    www.aol.com/study-finds-changes-cholesterol-may...

    Unexplained changes in cholesterol may help identify older adults at risk for dementia,study finds. Experts explain cholesterol and dementia risk.