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  2. Time formatting and storage bugs - Wikipedia

    en.wikipedia.org/wiki/Time_formatting_and...

    The last modification date stamp (and with DELWATCH 2.0+ also the file deletion date stamp, and since DOS 7.0+ optionally also the last access date stamp and creation date stamp), are stored in the directory entry with the year represented as an unsigned seven bit number (0–127), relative to 1980, and thereby unable to indicate any dates in ...

  3. Decimal data type - Wikipedia

    en.wikipedia.org/wiki/Decimal_data_type

    Some IBM systems and SQL systems support DECFLOAT format with at least the two larger formats. [3] ABAP's new DECFLOAT data type includes decimal64 (as DECFLOAT16) and decimal128 (as DECFLOAT34) formats. [4] PL/I natively supports both fixed-point and floating-point decimal data.

  4. Data validation - Wikipedia

    en.wikipedia.org/wiki/Data_validation

    Format checks. Each of the first 9 digits must be 0 through 9, and the 10th must be either 0 through 9 or an X. Check digit. To detect transcription errors in which digits have been altered or transposed, the last digit of a pre-2007 ISBN must match the result of a mathematical formula incorporating the other 9 digits (ISBN-10 check digits).

  5. SQL - Wikipedia

    en.wikipedia.org/wiki/SQL

    SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...

  6. Template:Use mdy dates - Wikipedia

    en.wikipedia.org/wiki/Template:Use_mdy_dates

    This template should be placed near the top of articles that use the mmmm d, yyyy date format. Template parameters [Edit template data] This template prefers inline formatting of parameters. Parameter Description Type Status Month and year date The month and year that the article was last checked for inconsistent date formatting. May use "{{subst:DATE}}" template instead Example April 2022 ...

  7. SQL syntax - Wikipedia

    en.wikipedia.org/wiki/SQL_syntax

    SQL includes operators and functions for calculating values on stored values. SQL allows the use of expressions in the select list to project data, as in the following example, which returns a list of books that cost more than 100.00 with an additional sales_tax column containing a sales tax figure calculated at 6% of the price.

  8. PostgreSQL - Wikipedia

    en.wikipedia.org/wiki/PostgreSQL

    For Python, the current Python 3 is used, and the discontinued Python 2 is no longer supported as of PostgreSQL 15. Both were supported previously, defaulting to Python 2 , while old and new versions couldn't be used in the same session. [ 62 ]

  9. Python syntax and semantics - Wikipedia

    en.wikipedia.org/wiki/Python_syntax_and_semantics

    The syntax of the Python programming language is the set of rules that defines how a Python program will be written and interpreted (by both the runtime system and by human readers). The Python language has many similarities to Perl , C , and Java .