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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.
In most cases, an index is used to quickly locate the data records from which the required data is read. In other words, the index is only used to locate data records in the table and not to return data. A covering index is a special case where the index itself contains the required data fields and can answer the required data.
Another example is NM data, where an NM image, by definition, is a multi-dimensional multi-frame image. In these cases, three- or four-dimensional data can be encapsulated in a single DICOM object. Pixel data can be compressed using a variety of standards, including JPEG, lossless JPEG, JPEG 2000, and run-length encoding (RLE).
Such a database usually needed to persist past the specific uses of any individual program; it needed to store data for years and decades rather than for the life of a program. The first knowledge-based systems had data needs that were the opposite of these database requirements. An expert system requires structured data. Not just tables with ...
Cursor (databases), a control structure that enables traversal over the records in a database; Cursor, a value that is the position of an object in some known data structure, a predecessor of pointers; Cursor (slide rule), indicates corresponding points on scales that are not adjacent to each other
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Field Level Media. Steelers WR George Pickens to return vs. Chiefs. Weather. Weather. Fox Weather. Winter weather brings snow to I-95 corridor for Christmas Eve. Weather. Fox Weather.
Other stoppages have been much shorter, with economic analyses after the fact often showing that the lost money is then returned to the US economy in nearly equal measure after the government reopens.