PLS-00951：string Feature is not supported by this release
错误码
错误描述：string Feature is not supported by this release
错误原因：PL/SQL cannot understand something in an imported library unit. It uses some feature either too new or too old for this version to understand it.
解决方法：Recompile the imported library unit with this version of PL/SQL, to discover more precisely what feature is not supported.
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