我有一个表成员,他们是重复的条目,我想删除其中一个,但是其中一个条目有一些列更新,另一个有其他一些。
所以我想做的是更新,但是值存在于1中的列和null或另一个中为空,以便两行完全相同,并且不会丢失任何数据。
表格结构:
CREATE TABLE [dbo].[membermobilenumberisnull](
[TransId] [bigint] NOT NULL,
[member_id] [int] NOT NULL,
[gendertype] [int] NULL,
[relationship_rs_code] [nvarchar](2) NULL,
[ration_card_id] [int] NOT NULL,
[uid] [nvarchar](16) NULL,
[member_dob] [datetime] NULL,
[member_name_en] [nvarchar](150) NULL,
[mother_name_en] [nvarchar](150) NULL,
[father_name_en] [nvarchar](150) NULL,
[member_age] [smallint] NULL,
[nationality] [nvarchar](150) NULL,
[MobileNumber] [nvarchar](20) NULL,
[IsUpdated] [bigint] NULL,
[UpdationDate] [datetime] NULL,
[IsDeleted] [bigint] NULL,
[DeletionDate] [datetime] NULL,
[CreationDate] [datetime] NULL,
[UpdatedBy] [nvarchar](250) NULL,
[DeletedBy] [nvarchar](250) NULL,
[MobileNumber1] [nvarchar](20) NULL,
[MobileFlag] [nvarchar](250) NULL
) ON [PRIMARY]
GO
示例数据
TransId member_dob member_name_en member_age nationality MobileNumber UpdationDate CreationDate
252238402 12-09-1985 PUSHPINDER SINGH 31 IND NULL 30-07-2016
252238403 12-09-1985 PUSHPINDER SINGH 31 IND 8626934377 NULL 30-07-2016
260846102 03-06-1984 VUDDHI DEVI 32 IND 9459209701 19-10-2016 14-08-2016
260846105 03-06-1984 VUDDHI DEVI 32 IND NULL 14-08-2016
预期结果:
TransId member_dob member_name_en member_age nationality MobileNumber UpdationDate CreationDate
252238402 12-09-1985 PUSHPINDER SINGH 31 IND 8626934377 NULL 30-07-2016
252238403 12-09-1985 PUSHPINDER SINGH 31 IND 8626934377 NULL 30-07-2016
260846102 03-06-1984 VUDDHI DEVI 32 IND 9459209701 19-10-2016 14-08-2016
260846105 03-06-1984 VUDDHI DEVI 32 IND 9459209701 19-10-2016 14-08-2016
提前致谢
答案 0 :(得分:1)
假设您的合并PK为member_dob,member_name_en,member_age
UPDATE M1
SET M1.MobileNumber = ISNULL(NULLIF(M1.MobileNumber,''),M2.MobileNumber)
,M1.UpdationDate = ISNULL(M1.UpdationDate,M2.UpdationDate)
FROM Member AS M1
INNER JOIN Member AS M2 ON M1.TransId <> M2.TransId
AND M1.member_dob = M2.member_dob
AND M1.member_name_en = M2.member_name_en
AND M1.member_age = M2.member_age
答案 1 :(得分:0)
试试这个
WITH t2 AS (
SELECT member_dob, member_name_en, member_age, nationality, MobileNumber
FROM <<table>>
WHERE MobileNumber IS NOT NULL
)
UPDATE t1
SET MobileNumber = t2.MobileNumber
FROM <<table>> t1 JOIN t2
ON t1.member_dob = t2.member_dob
AND t1.member_name_en = t2.member_name_en
AND t1.member_age = t2.member_age
AND t2.nationality = t2.nationality
WHERE t1.MobileNumber IS NULL
答案 2 :(得分:0)
似乎你想查看一个member_name_en
并从其记录中获取一个值,而不是null而不是null。然后只需汇总并使用MIN
或MAX
来选择此值。
update m
set member_dob = src.max_member_dob
, member_age = src.max_member_age
, nationality = src.max_nationality
etc.
from membermobilenumberisnull m
(
select
member_name_en,
max(member_dob) as max_member_dob,
max(member_age) as max_member_age,
max(nationality) as max_nationality,
etc.
from membermobilenumberisnull
group by member_name_en
) src on src.member_name_en = m.member_name_en;