SQL Problems Requiring Cursors
A cursor is a construct available in most implementations of SQL that allows the programmer to handle data in a row-by-row manner rather than as a group. Parallelizing row-by-row processing is much more complex than serial processing, which is another reason to make use of non-procedural SQL wherever possible. Database vendors typically handle parallel processing without requiring special handling by application developers.
Parallel processing can be orders of magnitude faster than serial processing.
Read more about SQL Problems Requiring Cursors: Constraints, Example: Insert Rows Based On A Count in The Table Itself
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