PCC-02322：found undefined identifier
错误码
错误描述：found undefined identifier
错误原因：An identifier used in a SQL statement was not defined. For example, a cursor name was referenced that had not been declared, or in a DECLARE CURSOR statement, a statement name was used that had not been PREPAREd.
解决方法：Check that all SQL identifiers, such as cursor names and statement names, have been defined before use. Provide a declaration for the variable and/or its type identifier.
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