Oracle Form開發(4)
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1.2 單擊Create
1.3 輸Èë²é詢SQL
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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 ......