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  2. Null (SQL) - Wikipedia

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

    E. F. Codd mentioned nulls as a method of representing missing data in the relational model in a 1975 paper in the FDT Bulletin of ACM-SIGMOD.Codd's paper that is most commonly cited with the semantics of Null (as adopted in SQL) is his 1979 paper in the ACM Transactions on Database Systems, in which he also introduced his Relational Model/Tasmania, although much of the other proposals from ...

  3. pandas (software) - Wikipedia

    en.wikipedia.org/wiki/Pandas_(software)

    Pandas also supports the syntax data.iloc[n], which always takes an integer n and returns the nth value, counting from 0. This allows a user to act as though the index is an array-like sequence of integers, regardless of how it's actually defined. [9]: 110–113 Pandas supports hierarchical indices with multiple values per data point.

  4. Boolean data type - Wikipedia

    en.wikipedia.org/wiki/Boolean_data_type

    In JavaScript, the empty string (""), null, undefined, NaN, +0, −0 and false [28] are sometimes called falsy (of which the complement is truthy) to distinguish between strictly type-checked and coerced Booleans (see also: JavaScript syntax#Type conversion). [29] As opposed to Python, empty containers (Arrays, Maps, Sets) are considered truthy.

  5. The top 7 mental health challenges of the holidays and how to ...

    www.aol.com/top-7-mental-health-challenges...

    Show comments. Advertisement. Advertisement. Holiday Shopping Guides. See all. AOL. This popular vitamin C serum is on sale for just $10: '60 is the new 40' AOL.

  6. I asked a woman I'd known for 1 day to fly to Australia for ...

    www.aol.com/asked-someone-id-known-1-224137863.html

    "I’m often asked if I knew it would work out. The truth is I didn’t." Ash Jurberg shares the story of meeting his wife in an essay for TODAY.com.

  7. Jennifer Lopez’s 23 Greatest Style Moments of 2024 - AOL

    www.aol.com/jennifer-lopez-23-greatest-style...

    In a world of quiet luxury, I thank the universe for Jennifer Lopez. Since her entry into Hollywood nearly three decades ago, the singer, actor, and all-around superstar has continuously stuck to ...

  8. Panel data - Wikipedia

    en.wikipedia.org/wiki/Panel_data

    Both datasets above are structured in the long format, which is where one row holds one observation per time. Another way to structure panel data would be the wide format where one row represents one observational unit for all points in time (for the example, the wide format would have only two (first example) or three (second example) rows of ...

  9. List of David Tennant performances - Wikipedia

    en.wikipedia.org/wiki/List_of_David_Tennant...

    Wild About Pandas [133] Our Secret Universe: The Hidden Life of the Cell [134] 2013: Penguins – Spy in the Huddle [135] 2014: Dolphins - Spy in the Pod: BBC Wildlife Specials [136] 2014–2017: W1A: Sequel to Twenty Twelve [137] 2015: Pets – Wild at Heart: BBC Wildlife Specials [138] Growing Up Wild [139] Knights of Classic Drama: Dames of ...