The CREATE PROCEDURE statement provides special syntax for Oracle routines in packages, a three-part name in the SOURCEclause where the middle part identifies the package.
It USES an additional source column on the SELECT clause in each UNION ALL view to indicate the source of the data.
它在每个NION ALL视图中的select子句上使用一个附加的源列表明数据的来源。
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Columns defined with the BLOB data type, or using the FOR BIT data clause will be passed as binary from the source to the target, and the code page used is zero.
通过BLOB数据类型或使用FOR BIT data子句定义的列将以二进制形式从源传递到目标，所使用的代码页是零。