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  2. Data cleansing - Wikipedia

    en.wikipedia.org/wiki/Data_cleansing

    For example, no two persons can have the same social security number. Set-Membership constraints: The values for a column come from a set of discrete values or codes. For example, a person's sex may be Female, Male or Non-Binary. Foreign-key constraints: This is the more general case of set membership. The set of values in a column is defined ...

  3. Comma-separated values - Wikipedia

    en.wikipedia.org/wiki/Comma-separated_values

    Comma-separated value lists are easier to type (for example into punched cards) than fixed-column-aligned data, and they were less prone to producing incorrect results if a value was punched one column off from its intended location. Comma separated files are used for the interchange of database information between machines of two different ...

  4. SQL syntax - Wikipedia

    en.wikipedia.org/wiki/SQL_syntax

    Title Authors ----- ----- SQL Examples and Guide 4 The Joy of SQL 1 An Introduction to SQL 2 Pitfalls of SQL 1 Under the precondition that isbn is the only common column name of the two tables and that a column named title only exists in the Book table, one could re-write the query above in the following form:

  5. Database normalization - Wikipedia

    en.wikipedia.org/wiki/Database_normalization

    For this example it is assumed that each book has only one author. A table that conforms to the relational model has a primary key which uniquely identifies a row. In our example, the primary key is a composite key of {Title, Format} (indicated by the underlining):

  6. Attention DOGE: Here’s how the federal government spends ...

    www.aol.com/attention-doge-federal-government...

    As the co-heads of the newly created Department of Government Efficiency, or DOGE, billionaires Elon Musk and Vivek Ramaswamy are promising to slash at least $2 trillion from the federal budget.

  7. Teen hunter murders parents, brother in gruesome crime that ...

    www.aol.com/teen-hunter-murders-parents-brother...

    A teenage hunter allegedly shot dead his parents and younger brother before taking his own life in a horrifying murder-suicide. Clifford Hunt Jr., 19, is believed to have shot parents Michelle, 48 ...

  8. Rob Lowe reveals he recorded a yacht-rock demo with Toto ...

    www.aol.com/rob-lowe-reveals-recorded-yacht...

    At a key turning point in his '80s stardom, Rob Lowe set his sights beyond the silver screen — into the choppy waters of yacht rock. While discussing the genre with Bill Simmons, executive ...

  9. Relational algebra - Wikipedia

    en.wikipedia.org/wiki/Relational_algebra

    The relational algebra uses set union, set difference, and Cartesian product from set theory, and adds additional constraints to these operators to create new ones.. For set union and set difference, the two relations involved must be union-compatible—that is, the two relations must have the same set of attributes.