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  2. Sort-merge join - Wikipedia

    en.wikipedia.org/wiki/Sort-merge_join

    The sort-merge join (also known as merge join) is a join algorithm and is used in the implementation of a relational database management system. The basic problem of a join algorithm is to find, for each distinct value of the join attribute, the set of tuples in each relation which display that value. The key idea of the sort-merge algorithm is ...

  3. Relational algebra - Wikipedia

    en.wikipedia.org/wiki/Relational_algebra

    The natural join can be simulated with Codd's primitives as follows. Assume that c 1,...,c m are the attribute names common to R and S, r 1,...,r n are the attribute names unique to R and s 1,...,s k are the attribute names unique to S. Furthermore, assume that the attribute names x 1,...,x m are neither in R nor in S.

  4. List of GNU Core Utilities commands - Wikipedia

    en.wikipedia.org/wiki/List_of_GNU_Core_Utilities...

    df: Shows disk free space on file systems dir: Is exactly like "ls -C -b". (Files are by default listed in columns and sorted vertically.) dircolors: Set up color for ls: install: Copies files and set attributes ln: Creates a link to a file ls: Lists the files in a directory mkdir: Creates a directory mkfifo: Makes named pipes (FIFOs) mknod

  5. Row and column vectors - Wikipedia

    en.wikipedia.org/wiki/Row_and_column_vectors

    The transpose (indicated by T) of any row vector is a column vector, and the transpose of any column vector is a row vector: […] = [] and [] = […]. The set of all row vectors with n entries in a given field (such as the real numbers ) forms an n -dimensional vector space ; similarly, the set of all column vectors with m entries forms an m ...

  6. 8 Things Southerners Love To Put In Their Stockings ... - AOL

    www.aol.com/8-things-southerners-love-put...

    Whether it’s shiny new jewelry, a deck of cards, or fun finds from the dollar store, our readers agree stockings are the perfect holders for small gifts.

  7. Texas warning of "maneater" screwworms that lay eggs in flesh

    www.aol.com/texas-warning-maneater-screwworms...

    Just one fly can lay up to 300 eggs at a time and is drawn "to the odor of a wound or natural opening on a live, warm-blooded animal."

  8. Range of a function - Wikipedia

    en.wikipedia.org/wiki/Range_of_a_function

    Sometimes "range" refers to the image and sometimes to the codomain. In mathematics, the range of a function may refer to either of two closely related concepts: the codomain of the function, or; the image of the function. In some cases the codomain and the image of a function are the same set; such a function is called surjective or onto.

  9. 2 Oregon men found dead from exposure in forest while ... - AOL

    www.aol.com/news/2-oregon-men-found-dead...

    A family member reported the two men missing to Skamania County police at around 1 a.m. on Dec. 25. A “grueling” three-day search was conducted for the men as over 60 volunteer search and ...