PLS-00211：CASE labels or ranges must not be duplicated in different WHEN clauses
错误码
错误描述：CASE labels or ranges must not be duplicated in different WHEN clauses
错误原因：In this CASE statement, a value appears in more than one WHEN clause. A value may appear in at most one WHEN clause of a CASE statement.
解决方法：n/a
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