simple way to merge two rows in a
11g 11.2.03with test_temp as
(select 'x' key,to_char(1) col1,null col2 from dual
UNION
select 'x' key,null col1,'a' col2 from dual
UNION
select 'y' key,'a' col1,'b' col2 from dual
UNION
select 'z' key,'a' col1,null col2 from dual
UNION
select 'z' key,null col1,to_char(2) col2 from dual)
select * from test_temp
givesKEY COL1 COL2
----- ------- -------
x 1
x a
y a b
z a
z 2
smart way to get:KEY COL1 COL2
----- ------- -------
x 1 a
y a b
z a 2
Essentially, I want to merge two lines based on a common key and remove all columns with NULL values, and merge them into a single line. The col1 and col2 can have any data types (number, char, date, etc.) ideas?Published by: user13007502 on July 13, 2012 01:11
Published by: user13007502 on July 13, 2012 01:46
Published by: user13007502 on July 13, 2012 02:05
Published by: user13007502 on July 13, 2012 02:09
user13007502 wrote:
Sorry guys. My example was not the best. The numbers are just one example. I expanded the sample to display more realistic data.I just want to know if there is a smart way to merge two or more lines according to a key. Line is merged only when the merged line will result in a single line.
So, as I said...
SQL> ed
Wrote file afiedt.buf
1 with test_temp as
2 (select 'x' key,to_char(1) col1,null col2 from dual
3 UNION
4 select 'x' key,null col1,'a' col2 from dual
5 UNION
6 select 'y' key,'a' col1,'b' col2 from dual
7 UNION
8 select 'z' key,'a' col1,null col2 from dual
9 UNION
10 select 'z' key,null col1,to_char(2) col2 from dual)
11 select key
12 ,max(col1) as col1
13 ,max(col2) as col2
14 from test_temp
15* group by key
SQL> /
K C C
- - -
z a 2
x 1 a
y a b
What is the problem you are having?
I feel that you don't even try the solutions proposed. Or well you're not giving us a pretty good example of what is the question.
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