半链接改写成关联

SQL> select sum(nvl(GetBusinessZongE('BusinessApprove', BA.SerialNo), 0)) as BusinessSum,
       sum(nvl(GetBusinessChangKou('BusinessApprove', BA.SerialNo), 0)) as ApproveSum
  from Business_Approve BA
 where 1 = 1
   and not exists (select 'x'
          from Business_Contract
         where RelativeSerialNo = BA.SerialNo)
   and BA.StatusFlag is null
   and exists
   (select 'x'
          from Customer_Info
         where (EMcCustomerID = '' or CustomerID = '20131119000089')
         and 
         (
               (BA.CustomerID = CustomerID and BA.BusinessType <> '1020040') or
               (BA.ThirdPartyID2 = CustomerID and BA.BusinessType = '1020040')
         )
   )
   and (BA.BusinessType like '1%' or BA.BusinessType like '2%')
   and BA.BusinessType not in
       ('1110008040', '1110008041', '1110008042', '4010', '4020');  2    3    4    5    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   21  

BUSINESSSUM APPROVESUM
----------- ----------


SQL> select * from table(dbms_xplan.display_cursor(null,null,'ALLSTATS LAST'));


PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID	8kxqnmdm3qfk1, child number 0
-------------------------------------
select sum(nvl(GetBusinessZongE('BusinessApprove', BA.SerialNo), 0)) as
BusinessSum,	    sum(nvl(GetBusinessChangKou('BusinessApprove',
BA.SerialNo), 0)) as ApproveSum   from Business_Approve BA  where 1 = 1
   and not exists (select 'x'		from Business_Contract
where RelativeSerialNo = BA.SerialNo)	 and BA.StatusFlag is null
and exists    (select 'x'	    from Customer_Info		where
(EMcCustomerID = '' or CustomerID = '20131119000089')	       and
    (		     (BA.CustomerID = CustomerID and BA.BusinessType <>
'1020040') or		     (BA.ThirdPartyID2 = CustomerID and
BA.BusinessType = '1020040')	      )    )	and (BA.BusinessType
like '1%' or BA.BusinessType like '2%')    and BA.BusinessType not in
     ('1110008040', '1110008041', '1110008042', '4010', '4020')

Plan hash value: 1312284355

--------------------------------------------------------------------------------------------------------------------------------------------------------
| Id  | Operation		| Name				 | Starts | E-Rows | A-Rows |	A-Time	 | Buffers | Reads  |  OMem |  1Mem | Used-Mem |
--------------------------------------------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT	|				 |	1 |	   |	  1 |00:00:01.72 |   23998 |  23097 |	    |	    |	       |
|   1 |  SORT AGGREGATE 	|				 |	1 |	 1 |	  1 |00:00:01.72 |   23998 |  23097 |	    |	    |	       |
|*  2 |   FILTER		|				 |	1 |	   |	  0 |00:00:01.72 |   23998 |  23097 |	    |	    |	       |
|*  3 |    HASH JOIN RIGHT ANTI |				 |	1 |   1457 |	139 |00:00:01.72 |   23849 |  23097 |	 11M|  4048K|	13M (0)|
|*  4 |     INDEX FAST FULL SCAN| PK_BC_RELATIVESERIALNO	 |	1 |    202K|	202K|00:00:00.06 |     744 |	  0 |	    |	    |	       |
|*  5 |     TABLE ACCESS FULL	| BUSINESS_APPROVE		 |	1 |    145K|	160K|00:00:01.29 |   23105 |  23097 |	    |	    |	       |
|*  6 |    INDEX UNIQUE SCAN	| BIN$oTAOXbMjMHLgQwoCgBIwcg==$0 |    139 |	 1 |	  0 |00:00:00.01 |     149 |	  0 |	    |	    |	       |
--------------------------------------------------------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   2 - filter( IS NOT NULL)
   3 - access("RELATIVESERIALNO"="BA"."SERIALNO")
   4 - filter("RELATIVESERIALNO" IS NOT NULL)
   5 - filter((("BA"."BUSINESSTYPE" LIKE '1%' OR "BA"."BUSINESSTYPE" LIKE '2%') AND "BA"."STATUSFLAG" IS NULL AND
	      "BA"."BUSINESSTYPE"<>'1110008040' AND "BA"."BUSINESSTYPE"<>'4010' AND "BA"."BUSINESSTYPE"<>'1110008042' AND "BA"."BUSINESSTYPE"<>'1110008041'
	      AND "BA"."BUSINESSTYPE"<>'4020'))
   6 - access("CUSTOMERID"='20131119000089')
       filter((("CUSTOMERID"=:B1 AND :B2<>'1020040') OR ("CUSTOMERID"=:B3 AND :B4='1020040')))


41 rows selected.

SQL> explain plan for select sum(nvl(GetBusinessZongE('BusinessApprove', BA.SerialNo), 0)) as BusinessSum,
       sum(nvl(GetBusinessChangKou('BusinessApprove', BA.SerialNo), 0)) as ApproveSum
  from Business_Approve BA
 where 1 = 1
   and not exists (select 'x'
          from Business_Contract
         where RelativeSerialNo = BA.SerialNo)
   and BA.StatusFlag is null
   and exists
   (select 'x'
          from Customer_Info
         where (EMcCustomerID = '' or CustomerID = '20131119000089')
         and 
         (
               (BA.CustomerID = CustomerID and BA.BusinessType <> '1020040') or
               (BA.ThirdPartyID2 = CustomerID and BA.BusinessType = '1020040')
         )
   )
   and (BA.BusinessType like '1%' or BA.BusinessType like '2%')
   and BA.BusinessType not in
       ('1110008040', '1110008041', '1110008042', '4010', '4020');  2    3    4    5    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   21  

Explained.

SQL> select * from table(dbms_xplan.display());

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value: 1312284355

------------------------------------------------------------------------------------------------------------------
| Id  | Operation		| Name				 | Rows  | Bytes |TempSpc| Cost (%CPU)| Time	 |
------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT	|				 |     1 |    58 |	 |  8626   (1)| 00:01:44 |
|   1 |  SORT AGGREGATE 	|				 |     1 |    58 |	 |	      | 	 |
|*  2 |   FILTER		|				 |	 |	 |	 |	      | 	 |
|*  3 |    HASH JOIN RIGHT ANTI |				 |  1457 | 84506 |  4936K|  7169   (1)| 00:01:27 |
|*  4 |     INDEX FAST FULL SCAN| PK_BC_RELATIVESERIALNO	 |   202K|  2565K|	 |   201   (1)| 00:00:03 |
|*  5 |     TABLE ACCESS FULL	| BUSINESS_APPROVE		 |   145K|  6403K|	 |  6334   (1)| 00:01:17 |
|*  6 |    INDEX UNIQUE SCAN	| BIN$oTAOXbMjMHLgQwoCgBIwcg==$0 |     1 |    16 |	 |     2   (0)| 00:00:01 |
------------------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   2 - filter( EXISTS (SELECT 0 FROM "CUSTOMER_INFO" "CUSTOMER_INFO" WHERE "CUSTOMERID"='20131119000089'
	      AND ("CUSTOMERID"=:B1 AND :B2<>'1020040' OR "CUSTOMERID"=:B3 AND :B4='1020040')))
   3 - access("RELATIVESERIALNO"="BA"."SERIALNO")
   4 - filter("RELATIVESERIALNO" IS NOT NULL)
   5 - filter(("BA"."BUSINESSTYPE" LIKE '1%' OR "BA"."BUSINESSTYPE" LIKE '2%') AND "BA"."STATUSFLAG" IS
	      NULL AND "BA"."BUSINESSTYPE"<>'1110008040' AND "BA"."BUSINESSTYPE"<>'4010' AND
	      "BA"."BUSINESSTYPE"<>'1110008042' AND "BA"."BUSINESSTYPE"<>'1110008041' AND "BA"."BUSINESSTYPE"<>'4020')
   6 - access("CUSTOMERID"='20131119000089')
       filter("CUSTOMERID"=:B1 AND :B2<>'1020040' OR "CUSTOMERID"=:B3 AND :B4='1020040')

26 rows selected.


改写成；
 select sum(nvl(GetBusinessZongE('BusinessApprove', BA.SerialNo), 0)) as BusinessSum,
       sum(nvl(GetBusinessChangKou('BusinessApprove', BA.SerialNo), 0)) as ApproveSum
  from Business_Approve BA
  inner join (select CustomerID from Customer_Info
  where (EMcCustomerID = '' or CustomerID = '20131119000089')
  group by CustomerID) Customer_Info
  on ((case when BA.BusinessType= '1020040' then BA.ThirdPartyID2 else BA.CustomerID end))=Customer_Info.CustomerID
 where 1 = 1
   and not exists (select 'x'
          from Business_Contract
         where RelativeSerialNo = BA.SerialNo)
   and BA.StatusFlag is null
     and (BA.BusinessType like '1%' or BA.BusinessType like '2%')
   and BA.BusinessType not in
       ('1110008040', '1110008041', '1110008042', '4010', '4020');