Add new clause to FOR UPDATE WITH LOCK: SKIP LOCKED - for selecting 'free'
record(s) from table or updatable view
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Key: CORE-4385
URL: http://tracker.firebirdsql.org/browse/CORE-4385
Project: Firebird Core
Issue Type: Improvement
Reporter: Pavel Zotov
Currently one need to write cursor with trying to update record and catch lock
conflicts in when-block to skip rows which are locked by others.
It will be useful if FB has the mechanism to obtain non-locked record(s)
directly in SELECT statement.
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