sql優(yōu)化實(shí)戰(zhàn) 把full join改為left join +union all(從5分鐘降為10秒)

select isnull(vv.customer_id,v.customer_id) as customer_id,
		isnull(vv.business_date,replace(v.business_date,'-','')) as business_date,
		v.prod_id,
		v.sales,
		vv.visit_count,
    v.all_sales
from 
(
  SELECT a.customer_id ,
	    max(month)+'-01' as business_date,
      a.PROD_ID ,
      SUM(CAST(VALUE AS NUMERIC(38, 3))) sales,
      sum(SUM(CAST(VALUE AS NUMERIC(38, 3)))) over(partition by a.customer_id) as all_sales
							
  FROM  TB_IMPORT_SALES a 
  WHERE  a.customer_id IS NOT NULL
      AND a.PROD_ID IS NOT NULL
			and a.month='2016-11'
  GROUP BY a.customer_id ,
      a.PROD_ID
)v
full join
(
  SELECT customer_id, 
	    max(a.business_date) as business_date,
      COUNT(*) AS VISIT_COUNT 
	FROM TB_CALL_STORE a WITH(NOLOCK)
	inner join TB_TIME d
	on a.business_date = d.t_date 
	where d.section ='2016-11'
	GROUP BY customer_id
)vv
on v.customer_id = vv.customer_id

select v.customer_id,
		replace(max(v.business_date),'-','') as business_date,
		v.prod_id,
		max(v.sales_volume) sales_volume ,
		max(v.visit_count) visit_count,
        max(v.all_sales_volume) all_sales_volume
from 
(
  SELECT a.customer_id ,
	    max(biz_month)+'-01' as business_date,
      a.PROD_ID ,
      SUM(CAST(VALUE1 AS NUMERIC(38, 8))) sales_volume,
      sum(SUM(CAST(VALUE1 AS NUMERIC(38, 8)))) over(partition by a.customer_id) as all_sales_volume,
			null as visit_count
							
  FROM  TB_IMPORT_SALES a 
  WHERE  a.customer_id IS NOT NULL
      AND a.PROD_ID IS NOT NULL
			and a.month='2016-11'
  GROUP BY a.customer_id ,
       a.PROD_ID
  union all
 
  SELECT customer_id, 
	    max(a.business_date) as business_date,
		  p.prod_id,
		  null,
		  null,
      COUNT(*) AS VISIT_COUNT 
	FROM TB_CALL_STORE a WITH(NOLOCK)
	cross apply
	(
		select top 1 prod_id from TB_PRODUCT with(nolock)
	)p
	inner join TB_TIME d
	on a.business_date = d.t_date 
	where d.section ='2016-11'
	GROUP BY customer_id,p.prod_id
)v
group by v.customer_id,
     v.prod_id