PL/SQL: ORA-00920: invalid relational operator" Error

PL/SQL: ORA-00920: invalid relational operator" Error --- :confused:

Please Tell me if you can resolve this "PL/SQL: ORA-00920: invalid relational operator" Error in the :- code :-

DECLARE BSSS_HighPr VARCHAR2(11);

BSSS_LowPr VARCHAR2(11);

IF ACCOUNT_ROW.tax2_id IN
(999999999,888888888,777777777,666666666,555555555,444444444,333333333,222222222,111111111)

AND ACCOUNT_ROW.tax1_id IS NULL

AND ACCOUNT_ROW.tax2_id IS NOT NULL

THEN Tax_Id_where_clause := 'A.TAX_ID = ' || ACCOUNT_ROW.tax2_id;

SELECT MAX(to_number(TRD_PR)),MIN(to_number(TRD_PR)) INTO BSSS_HighPr,BSSS_LowPr

FROM BS_TRADE WHERE Tax_Id_where_clause /* ---- gETTING ERROR here ---- */

GROUP BY TRD_PR,TRD_DT; PLEASE reply :confused: :confused:

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