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In SQL, the unique keys have a UNIQUE constraint assigned to them in order to prevent duplicates (a duplicate entry is not valid in a unique column). Alternate keys may be used like the primary key when doing a single-table select or when filtering in a where clause, but are not typically used to join multiple tables.
PostgreSQL can be expected to work on any of the following instruction set architectures (and operating systems): 64-bit x86-64 and 32-bit x86 on Windows and other operating systems; these are supported on other than Windows: 64-bit ARM [93] and the older 32-bit ARM, including older such as ARMv6 in Raspberry Pi [94]), RISC-V, z/Architecture, S ...
MySQL (/ ˌ m aɪ ˌ ɛ s ˌ k juː ˈ ɛ l /) [6] is an open-source relational database management system (RDBMS). [6] [7] Its name is a combination of "My", the name of co-founder Michael Widenius's daughter My, [1] and "SQL", the acronym for Structured Query Language.
As of 21 January 2025 (two months after PHP 8.4's release), PHP is used as the server-side programming language on 75.0% of websites where the language could be determined; PHP 7 is the most used version of the language with 47.1% of websites using PHP being on that version, while 40.6% use PHP 8, 12.2% use PHP 5 and 0.1% use PHP 4.
phpMyAdmin is a free and open source administration tool for MySQL and MariaDB. As a portable web application written primarily in PHP , it has become one of the most popular MySQL administration tools, especially for web hosting services .
PHP implementation of Test::More (test-more.php) [460] SnapTest: Yes: Yes [461] SnapTest is a powerful unit testing framework for PHP 5+, leveraging PHP's unique runtime language to simplify the unit test process without sacrificing the agility tests provide. OnionTest: No: Yes: Write an Onion! No coding needed just some txt files. Enhance PHP ...
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 ...
The create() method is used for registering public key authenticators as part of associating them with user accounts (possibly at initial account creation time but more likely when adding a new security device to an existing account) while the get() method is used for authenticating (such as when logging in).