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The unique index serves two purposes: (i) to enforce entity integrity, since primary key data must be unique across rows and (ii) to quickly search for rows when queried. Since surrogate keys replace a table's identifying attributes—the natural key—and since the identifying attributes are likely to be those queried, then the query optimizer ...
September 7, 2013, [33] Andrey Sitnik started to develop PostCSS based on the Rework ideas. [34] In 3 months, the first PostCSS plugin, grunt-pixrem was released. [35] December 22, 2013, Autoprefixer version 1.0 migrated to PostCSS. [36] For PostCSS, the primary style focus is alchemy. [37] The project logo represents the philosopher's stone. [38]
A key-sequenced data set (KSDS) is a type of data set used by IBM's VSAM computer data storage system. [ 1 ] : 5 Each record in a KSDS data file is embedded with a unique key. [ 1 ] : 20 A KSDS consists of two parts, the data component and a separate index file known as the index component which allows the system to physically locate the record ...
Designers often desire an open-ended data structure that allows for future extension without modifying existing code or data. In such situations, all or part of the data model may be expressed as a collection of 2-tuples in the form <attribute name, value> with each element being an attribute–value pair. Depending on the particular ...
The latter two display a menu with the currently selected input method highlighted, and debuted in Windows 8. ⊞ Win + ⇧ Shift + Space goes through the list backwards. For the first two shortcuts going backwards is done by using the right ⇧ Shift key instead of the left.
In relational algebra, a rename is a unary operation written as / where: . R is a relation; a and b are attribute names; b is an attribute of R; The result is identical to R except that the b attribute in all tuples is renamed to a. [1]
Excel for Microsoft Windows requires Windows and includes Windows 2.01 in run-time. Excel runs on 286- and 386-based systems with an accelerator board. Excel offers Dynamic Data Exchange, a Windows feature. Excel reads and writes 1-2-3 files and accepts 1-2-3 macros. [17] [338] November
This is the long process as the Irish Passport Office [61] and NDLS [62] require two years of 'proof of usage' e.g bank statements in your new name dating back two years in order to change your name in comparison to a registered deed poll which allows you to change your name in the NDLS instantly along with DESAP. [63]