我从这样一张表上阅读到：

query = (
"select mandant,posnr,systemdat,
"lieferbedingung,loeschhafen,bereich," 
"nrkreis_nr from eakopf_t where posnr[10,10] = \" \" and posnr[1,2] not in (\"99\",\"RE\",\"UB\") and mandant <> 999;"
)

df = pd.read_sql(query, engine.connect())

但我得到这个错误：

ibm_db_dbi::DatabaseError: SQLNumResultCols failed: [IBM][CLI Driver][IDS/UNIX64] Column ( ) not found in any table in the query (or SLV is undefined). SQLCODE=-217
[SQL: select mandant,posnr,systemdat,lieferbedingung,loeschhafen,bereich,nrkreis_nr from eakopf_t where posnr[10,10] = " " and posnr[1,2] not in ("99","RE","UB") and mandant <> 999;]

是否可以进一步调试导致问题的确切列？因为否则，所有列名称似乎都存在于数据集中。