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specific mechanism used, the UUID must not only be guaranteed to be different from each other, or at least be very different from any other generic unique identifiers that were generated before the 3400 AD.The universal unique identifier can also be used to point to most possible objects. Microsoft and some other software companies tend to use the globally unique identifier (GUID), which is a type of universal unique identifier that can be used to po
See an article is about the SQL statement or the execution of Union all efficiency comparison, did not pay much attention to this problem, feel the article is good, turn to see. Article original link: http://www.cunyoulu.com/zhuanti/qtstudy/20081124orunion.htmComparison of the execution efficiency of the SQL statement or with UNION ALLWhen a SQL statement has multiple or statements, consider using union or union all instead to increase the speed. SQL statements that use or are often unable to be
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