Question

I have also a question regarding distinct and/or group by. My table as follow:

|   art   |   ean             |   obs   |   vke   |
---------------------------------------------------
|  type    |  1234567890123   |    1    |   100   |
|  type    |  1234567890123   |    0    |   50    |
|  type    |  1234567890123   |    0    |   60    |
|  type    |  1234567890123   |    0    |   70    |

I need the query to select always the row with obs = 1 and only the cheapest of the others with obs = 0. All other equal EAN should not be listed at all. Is this possible ?

So the result should be:

|  type    |  1234567890123   |    1    |   100   |
|  type    |  1234567890123   |    0    |   50    |

Answer 1

select art, ean, obs, vke 
from table_name
where obs = 1
union all
select art, ean, obs, min(vke) as vke
from table_name
where obs = 0
group by art, ean, obs

I’d union two results first one are all rows with obs aquals 1 and the second all rows grouped by art, ean, obs with obs equals 0 and min value of vke.

Read more about union and group by.