subtract two tables created by connection.cursor and display output on webpage

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I have displayed two tables on web(i.e table1 and table2) using connection.cursor from SOURCE table   ISSUE:   Now I have to subtract table1(fields)-table2(fields) and display the output as table3.    so final web page will have table1,table2,table3   PROGRAM:   IN views.py   #table 1   cursor1=connection.cursor()     cursor1.execute('''select dummy as LCR_CUSTOMER_TYPE,CUR AS CURRENCY, '$'+CONVERT(VARCHAR(20), CONVERT(MONEY, sum(LCR_NONOP_INS))) as LCR_NONOP_INS,  '$'+CONVERT(VARCHAR(20), CONVERT(MONEY, sum(LCR_OP_INS))) as LCR_OP_INS,  '$'+CONVERT(VARCHAR(20), CONVERT(MONEY, sum(LCR_NONOP_UNINS))) as LCR_NONOP_UNINS,  '$'+CONVERT(VARCHAR(20), CONVERT(MONEY, sum(LCR_OP_UNINS))) as LCR_OP_UNINS from (select *,(case when LCR_CUSTOMER_TYPE='Corporate' then 'Non-Credit Financial Entities' else LCR_CUSTOMER_TYPE end) as dummy from   DDA_BASED_S9_20150930) a group by CUR,dummy ''')     list=cursor1.fetchall(); --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------       #table 2     cursor = connection.cursor()     cursor.execute('''select AFTERMEMO,CUR AS CURRENCY, '$'+CONVERT(VARCHAR(20), CONVERT(MONEY, sum(LCR_NONOP_INS))) as LCR_NONOP_INS,  '$'+CONVERT(VARCHAR(20), CONVERT(MONEY, sum(LCR_OP_INS))) as LCR_OP_INS,  '$'+CONVERT(VARCHAR(20), CONVERT(MONEY, sum(LCR_NONOP_UNINS))) as LCR_NONOP_UNINS,  '$'+CONVERT(VARCHAR(20), CONVERT(MONEY, sum(LCR_OP_UNINS))) as LCR_OP_UNINS from (select *,(case when SIC_CODE = 7215 and  LCR_CUSTOMER_TYPE = 'Non-Credit Financial Entities' then 'NonFinancialCorp'  when LCR_CUSTOMER_TYPE = 'Corporate' then 'Non-Credit Financial Entities' else LCR_CUSTOMER_TYPE end) as AFTERMEMO from  DDA_BASED_S9_20150930) a group by  CUR,AFTERMEMO ''') list1=cursor.fetchall(); TABLE3=TABLE1-TABLE2 can anyone tell me how to do this...it will be very helpful   thanks in advance