Sql table needs multiple col update in a single T-Sql

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I have a table say tbl_a with say 3 cols W,X,Y,Z. i can say the table data will be like this:

W	X	Y	Z
1	A	L	U
2	B	L	V
3	C	L	W
			
5	Null	L	U
6	Null	L	M
7	Null	L	Null

in this rows 5,6,7 are copied 1,2,3. So both data in all columns should be same. Buy unfortunately some mistake hapend and some records ended like this. Is there any query to copy the mismatch cols in a single stretch?

plz advice...

Posted 27-Jun-13 18:59pm

Member 10112611

Updated 28-Jun-13 5:02am

Maciej Los

v2

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[no name] 28-Jun-13 1:38am

Share your existing query first.?

2 solutions

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Member 10112611 · Accepted Answer · 2013-06-27T21:04:00

Solution 1

What i know is to update columns one by one by using 2 temp tables for these 2 condiitons

SQL

select * into #a from tbl_a where w in(1,2,3)
select * into #b from tbl_a where w in(5,6,7)

update #b
set x=a.x,
   y=a.y,
   z=a.z
from #a a
where a.w+4=b.w

Posted 27-Jun-13 21:04pm

Member 10112611

Updated 28-Jun-13 5:03am

v2

Maciej Los · Accepted Answer · 2013-06-28T05:18:00

To update records in a single query, try something like this:

SQL

UPDATE t1
   SET t1.x = t2.x
       t1.y = t2.y
       t1.z = t2.z
FROM (
    SELECT *, ROW_NUMBER() OVER(ORDER BY w) AS RowNo
    FROM table1
    WHERE w IN (5,6,7)
   ) AS t1 INNER JOIN (
    SELECT *, ROW_NUMBER() OVER(ORDER BY w) AS RowNo
    FROM table1
    WHERE w IN (1,2,3)
) AS t2 ON t1.RowNo = t2.RowNo