oracle 11g sql developer 导入excel文件报12899

导入excel文件时：：：SQL 错误: ORA-12899: 列 "SYSTEM"."AAAAAA"."SCL_QX" 的值太大 (实际值: 6, 最大值: 4)
什么情况？？select * from nls_instance_parameters;为什么全是空的？
NLS_LANGUAGE SIMPLIFIED CHINESE
NLS_TERRITORY CHINA
NLS_SORT (null)
NLS_DATE_LANGUAGE (null)
NLS_DATE_FORMAT (null)
NLS_CURRENCY (null)
NLS_NUMERIC_CHARACTERS (null)
NLS_ISO_CURRENCY (null)
NLS_CALENDAR (null)
NLS_TIME_FORMAT (null)
NLS_TIMESTAMP_FORMAT (null)
NLS_TIME_TZ_FORMAT (null)
NLS_TIMESTAMP_TZ_FORMAT (null)
NLS_DUAL_CURRENCY (null)
NLS_COMP BINARY
NLS_LENGTH_SEMANTICS BYTE
NLS_NCHAR_CONV_EXCP FALSE