缓慢查询，使用前一个非空行中的值填充空单元格

Question

我得到了这个查询，用以前的非空行中的值填充空单元格，但它花了很长时间（几乎有 100.000 条记录）。

希望你能帮助我更快地查询来实现这一目标。

这些都是带有示例数据的 dll：

CREATE TABLE #TEST_INSURANCE_PAYMENTS(
     id_num int IDENTITY(1,1),[Provider] varchar(59), [Location] varchar(104),last_update datetime2, [Total_Charge] money
      );
INSERT INTO #TEST_INSURANCE_PAYMENTS
    ([Provider], [Location],[last_update],[Total_Charge])
VALUES
    ('Vimalkumar Veerappan', 'Arizona Heart Specialists',CURRENT_TIMESTAMP,100.0),
    (' ', 'Banner Boswell Medical Center - Inpatient',CURRENT_TIMESTAMP,102.0),
    (' ', 'Arizona Heart Specialists WEST',CURRENT_TIMESTAMP,800.0),
   ('Akash Makkar', 'Arizona Heart Specialists WEST',CURRENT_TIMESTAMP,500.0),
  (' ', 'Pinnacle Vein & Vascular Center Sun City',CURRENT_TIMESTAMP,500.0),
  (' ', 'Abrazo Arizona Heart Hospital - Outpatient',CURRENT_TIMESTAMP,60.0),
  (' ', 'Banner Boswell Medical Center - Inpatient',CURRENT_TIMESTAMP,60.0),
  (' ', 'Banner Del E Webb Medical Center - Inpatient',CURRENT_TIMESTAMP,10.0)
select id_num,[Provider],[Location],[Total_Charge],[last_update]
from #TEST_INSURANCE_PAYMENTS where IsNull([Provider], '') <> ''
union
select y.id_num, x.[Provider], y.[Location],y.[Total_Charge],y.[last_update]
from #TEST_INSURANCE_PAYMENTS as x
join(
select t1.id_num,max(t2.id_num) as MaxID, t1.[Location],t1.[Total_Charge],t1.[last_update]
from (select * from #TEST_INSURANCE_PAYMENTS where IsNull([Provider], '') = '') as t1
join (select * from #TEST_INSURANCE_PAYMENTS where IsNull([Provider], '') <> '') as t2 on t1.id_num > t2.id_num
group by t1.id_num,  t1.[Location],t1.[Total_Charge],t1.[last_update]
)as y on x.id_num = y.MaxID order by id_num;

Answer 1

如果没有计划，我们将无法判断正在发生什么（正如戴尔所建议的那样）。 同时，也许这会好一点：

SELECT x.id_num, COALESCE(NULLIF(x.Provider,' '),y.provider) AS [Provider], x.Location, x.last_update, x.Total_Charge
  FROM @TEST_INSURANCE_PAYMENTS x
    OUTER APPLY (SELECT MAX(id_num) AS mid_num FROM @TEST_INSURANCE_PAYMENTS y WHERE y.id_num < x.id_num AND y.[Provider] IS NOT NULL AND y.Provider <> ' ' AND x.Provider = '') a
    LEFT OUTER JOIN @TEST_INSURANCE_PAYMENTS y
      ON a.mid_num = y.id_num;

id_num	提供商	地点	最后更新	总费用
1	维马尔库马尔·维拉潘	亚利桑那州心脏专家	2023-10-04 15:55:59.6833333	100.00
2	维马尔库马尔·维拉潘	班纳博斯韦尔医疗中心 - 住院部	2023-10-04 15:55:59.6833333	102.00
3	维马尔库马尔·维拉潘	亚利桑那州西部心脏专家	2023-10-04 15:55:59.6833333	800.00
4	阿卡什·马卡	亚利桑那州西部心脏专家	2023-10-04 15:55:59.6833333	500.00
5	阿卡什·马卡	Pinnacle 静脉和血管中心太阳城	2023-10-04 15:55:59.6833333	500.00
6	阿卡什·马卡	亚利桑那州阿布拉索心脏病医院 - 门诊	2023-10-04 15:55:59.6833333	60.00
7	阿卡什·马卡	班纳博斯韦尔医疗中心 - 住院部	2023-10-04 15:55:59.6833333	60.00
8	阿卡什·马卡	Banner Del E Webb 医疗中心 - 住院病人	2023-10-04 15:55:59.6833333	10.00