cursor$18219$ - перевод на греческий
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cursor$18219$ - перевод на греческий

DATABASE CURSOR
Database cursor; SQL Cursor; Cursor (database)

cursor      
n. δρομέας
slide rule         
  • Quadratic and reciprocal scales
  • 1763 illustration of a slide rule
  • [[Faber-Castell]] slide rule with pouch
  • Electronic Calculating Punch]] explicitly comparing electronic computers to engineers calculating with slide rules
  • This slide rule is positioned to yield several values: From C scale to D scale (multiply by 2), from D scale to C scale (divide by 2), A and B scales (multiply and divide by 4), A and D scales (squares and square roots).
  • A duplex slide rule set to multiply any 2 by any number up to 50.
  • A slide rule made from index cards marked with powers of 2.
  • 550px
  • 300px
  • 300px
  • Engineer using a slide rule, with mechanical calculator in background, mid 20th century
  • The [[TI-30]] scientific calculator, introduced for under US$25 in 1976
  • adj=on}} teaching slide rule compared to a normal-sized model
MECHANICAL ANALOG COMPUTER
Slide ruler; Slide rules; Cursor (slide rules); Slide-rule; Sliderule; Slipstick; Slipsticks; Circular slide rule; Addition Slide Rule; Slide Rule; Cursor (slide rule); Circular calculator; Slide rule calculator; Sliderules; Wheel (slide rule); Cylindrical slide rule
λογαριθμικός κανόνας
diving bell         
  • Islamic painting]] of [[Alexander the Great]] lowered in a glass diving bell
  • Bell umbilical section
  • Barge with air-lock diving bell for working on moorings
  • Spalding's Diving Bell, ''The Saturday Magazine'', Vol. 14, 1839
  • Schematic of a dry bell with attached bell stage and separate clump weight
  • A Swedish Navy submarine rescue diving bell from the early 1940s
  • Open diving bell on a stern mounted launch and recovery system
  • Lexikon der gesamten Technik}} (''Dictionary of Technology''), 1904
  • Diver training using a wet bell
  • Personnel Transfer Capsule – closed diving bell
GAS FILLED CHAMBER FOR TRANSPORTING DIVERS VERTICALLY THROUGH THE WATER
Diving Bell; Sea bell; Wet bell; Closed bell; Rescue bell; Dry bell; Diving-bell; Bell cursor; Clump weight; Launch and recovery system (diving); Diving bells; Closed diving bell; Bell stage; Observation bell
καταδυτικό κουδούνι

Определение

cursor
1. <hardware> A visually distinct mark on a display indicating where newly typed text will be inserted. The cursor moves as text is typed and, in most modern editors, can be moved around within a document by the user to change the insertion point. 2. <database> In SQL, a named control structure used by an application program to point to a row of data. The position of the row is within a table or view, and the cursor is used interactively so select rows from columns. (1996-12-27)

Википедия

Cursor (databases)

In computer science, a database cursor is a mechanism that enables traversal over the records in a database. Cursors facilitate subsequent processing in conjunction with the traversal, such as retrieval, addition and removal of database records. The database cursor characteristic of traversal makes cursors akin to the programming language concept of iterator.

Cursors are used by database programmers to process individual rows returned by database system queries. Cursors enable manipulation of whole result sets at once. In this scenario, a cursor enables the sequential processing of rows in a result set.

In SQL procedures, a cursor makes it possible to define a result set (a set of data rows) and perform complex logic on a row by row basis. By using the same mechanics, a SQL procedure can also define a result set and return it directly to the caller of the SQL procedure or to a client application.

A cursor can be viewed as a pointer to one row in a set of rows. The cursor can only reference one row at a time, but can move to other rows of the result set as needed.