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下列哪一条语句用来查询列名()?
A.unionselectTOP1COLUMN_NAMEFROMINFORMATION_SCHEMA.COLUMNSwhereTABLE_NAME='xxx'-
B.unionselectTOP1COLUMN_NAMEFROMINFORMATION_SCHEMA.COLUMNSwhereTABLE_NAME='xxx'whereCOLUMN_NAMENOTIN('xxx')-
C.unionselectTOP1COLUMN_NAMEFROMINFORMATION_SCHEMA.COLUMNSwhereTABLE_NAME='xxx'whereCOLUMN_NAMENOTIN('xxx','xxx')-
D.unionselectTOP1FROMINFORMATION_SCHEMA.COLUMNS.tables