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Virtual Columns in Oracle Database 11g

When queried, virtual columns appear to be normal table columns, but
their values are derived rather than being stored on disc. The syntax
for defining a virtual column is listed below.
column_name [datatype] [GENERATED ALWAYS] AS (expression) [VIRTUAL]
If the datatype is omitted, it is determin ......

ASP.NET¿ç·þÎñÆ÷·ÃÎÊFileSystem

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