Sql where in clause multiple columns

原文链接

select *
from table1
WHERE  (CM_PLAN_ID,Individual_ID)
IN
(
 Select CM_PLAN_ID, Individual_ID
 From CRM_VCM_CURRENT_LEAD_STATUS
 Where Lead_Key = :_Lead_Key
)

要实现上面的in multiple columns的话

select * from table1 LEFT JOIN 
(
   Select CM_PLAN_ID, Individual_ID
   From CRM_VCM_CURRENT_LEAD_STATUS
   Where Lead_Key = :_Lead_Key
) table2
ON 
   table1.CM_PLAN_ID=table2.CM_PLAN_ID
   AND table1.Individual=table2.Individual
WHERE table2.CM_PLAN_ID IS NOT NULL

有distinct的问题

SELECT *
FROM table1
WHERE EXISTS (SELECT *
              FROM table2
              WHERE Lead_Key = @Lead_Key
                        AND table1.CM_PLAN_ID = table2.CM_PLAN_ID
                        AND table1.Individual_ID = table2.Individual_ID)

o(n^2)的性能

two lines is best…