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i guess it
'groupy by' takes several rows and turns them into one row. Because of this, it has to know what to do with all the combined rows where there have different values for some columns (fields). This is why you have two options for every field you want to SELECT : Either include it in the GROUP BY clause, or use it in an aggregate function so the system knows how you want to combine the field.
from http://stackoverflow.com/questions/20074562/group-by-without-aggregate-function
Ollivander's Inventory
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i guess it
from http://stackoverflow.com/questions/20074562/group-by-without-aggregate-function