分析函数改写notin-创新互联

1.OLD:

SELECT card.c_cust_id, card.TYPE, card.n_all_money
  FROM card
 WHERE     card.c_cust_id NOT IN (SELECT c_cust_id
                                    FROM card
                                   WHERE     TYPE IN ('11',
                                                      '12',
                                                      '13',
                                                      '14')
                                         AND flag = '1')
       AND card.TYPE IN ('11',
                         '12',
                         '13',
                         '14')
       AND card.flag = 'F';

2.优化方向

(1).主查询和子查询使用的表相同，条件差不多。考虑进行合并。

(2).

使用分析函数找出相同c_cust_id 既card.flag = 'F' 也 flag = '1' 或者只满足flag = '1' 然后将这部分记录过滤掉即可。

当分组结果card.flag = 'F' 也 flag = '1'   min(flag) over(partition by card.c_cust_id) = '1'

当分组结果flag = '1'   min(flag) over(partition by card.c_cust_id) = '1'

当分组结果flag = 'F'   min(flag) over(partition by card.c_cust_id) = 'F' (需要)

select card.c_cust_id, card.TYPE, card.n_all_money
from (select card.c_cust_id,
             card.TYPE,
			 card.n_all_money,
			 min(flag) over(partition by card.c_cust_id)
	  from card
	  where card.TYPE IN ('11',
                         '12',
                         '13',
                         '14') 
		and card.flag in ('1','F'))
where card.flag = 'F';