如何 select 两个不同的值并返回所有列？

Question

I want to select distinct values from two columns.

Example data:

ID TITLE SOURCE TARGET
1  asd   12      2
2  asd1  123     125
3  asd1  123     56  
4  asd2  123     125
5  asd3  164     146

I want to get distinct data for source and target columns ID - 2 and ID - 4 are duplicates.

ID TITLE SOURCE TARGET
1  asd   12      2
2  asd1  123     125
3  asd1  123     56  
5  asd3  164     146

Answer 1

If you just want the distinct values, use select distinct :

select distinct source, target
from example t;

If you want the rows where the source/target only appears on one row, then one method uses window functions:

select t.*
from (select t.*,
             count(*) over (partition by source, target) as cnt
      from example t
     ) t
where cnt = 1;