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The following tables compare general and technical information for a number of relational database management systems. Please see the individual products' articles for further information. Please see the individual products' articles for further information.
This is a comparison between notable database engines for the MySQL database management system (DBMS). A database engine (or "storage engine") is the underlying software component that a DBMS uses to create, read, update and delete (CRUD) data from a database.
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.
There is no limit on the number of decimal places for the decimal fraction. However, the number of decimal places needs to be agreed to by the communicating parties. For example, in Microsoft SQL Server, the precision of a decimal fraction is 3 for a DATETIME, i.e., "yyyy-mm-ddThh:mm:ss[.mmm]". [29]
The OFFSET clause specifies the number of rows to skip before starting to return data. The FETCH FIRST clause specifies the number of rows to return. Some SQL databases instead have non-standard alternatives, e.g. LIMIT, TOP or ROWNUM. The clauses of a query have a particular order of execution, [5] which is denoted by the number on the right ...
Gregorian dates follow the same rules but tend to be written in yyyy/mm/dd (Day first, month number, and year in right-to-left writing direction) format in N'ko language. Long format: D MMMM YYYY (Day first, month and year in left-to-right writing direction) for French and Fulah and YYYY, DD MMMM (First full month name, day, and year in right ...
1985-102 T 10:15 UTC — year 1985, day number 102, i.e., 1985 April 12; 1985-W15-5 T 10:15 UTC — year 1985, week number 15, weekday 5 = 1985 April 12; 20180203073000 — used in Wayback Machine memento URLs, equals 3 February 2018 07:30:00; Examples of datestamps: 2025-05-25 — ISO 8601 international representation of 2025 May 25; Examples ...
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 ...