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  2. Year 2038 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2038_problem

    Values greater than zero for the seconds field denote dates after the 0-hour, January 1, 1970. Values less than zero for the seconds field denote dates before the 0-hour, January 1, 1970. In both cases, the nseconds (nanoseconds) field is to be added to the seconds field for the final time representation.

  3. Select (SQL) - Wikipedia

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

    The query retrieves all rows from the Book table in which the price column contains a value greater than 100.00. The result is sorted in ascending order by title. The asterisk (*) in the select list indicates that all columns of the Book table should be included in the result set.

  4. SQL syntax - Wikipedia

    en.wikipedia.org/wiki/SQL_syntax

    Greater than Hire_Date > '2012-01-31' < Less than Bonus < 50000. 00 >= Greater than or equal Dependents >= 2 <= Less than or equal Rate <= 0. 05 [NOT] BETWEEN [SYMMETRIC] Between an inclusive range. SYMMETRIC inverts the range bounds if the first is higher than the second. Cost BETWEEN 100. 00 AND 500. 00 [NOT] LIKE [ESCAPE] Begins with a ...

  5. PostgreSQL - Wikipedia

    en.wikipedia.org/wiki/PostgreSQL

    PostgreSQL supports a binary communication protocol that allows applications to connect to the database server. The protocol is versioned (currently 3.0, as of PostgreSQL 7.4) and has a detailed specification. [47] The official client implementation of this communication protocol is a C API, libpq. [48]

  6. Relational database - Wikipedia

    en.wikipedia.org/wiki/Relational_database

    A relational database (RDB [1]) is a database based on the relational model of data, as proposed by E. F. Codd in 1970. [2]A Relational Database Management System (RDBMS) is a type of database management system that stores data in a structured format using rows and columns.

  7. Comparison of relational database management systems - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_relational...

    First public release date Latest stable version Latest release date License Public issues list 4D (4th Dimension) 4D S.A.S. 1984 v16.0 2017-01-10 [1] Proprietary: No ADABAS: Software AG: 1970 8.1 2013-06 Proprietary: No Adaptive Server Enterprise: SAP AG: 1987 16.0 SP03 PL07 2019-06-10 Proprietary: No Advantage Database Server (ADS) SAP AG ...

  8. Hierarchical and recursive queries in SQL - Wikipedia

    en.wikipedia.org/wiki/Hierarchical_and_recursive...

    A common table expression, or CTE, (in SQL) is a temporary named result set, derived from a simple query and defined within the execution scope of a SELECT, INSERT, UPDATE, or DELETE statement.

  9. Character large object - Wikipedia

    en.wikipedia.org/wiki/Character_large_object

    PostgreSQL 15.0: unsupported [3] but it can be easily defined as a synonym to the text type with: create domain CLOB as TEXT; MariaDB 10.8: supported [4] MySQL 8.0: support unknown. [5] There used [6] to be a CLOB mentioned in the manual but the data type is no longer mentioned in later manuals. Mimer SQL 11.0: supported. [7]