MySQL codes

i am to make a feature for mysql which is horizontal aggregation for our 
thesis. 

is this existing already? if not, is vertical aggregation existing? can you 
show me the codes for it? i need it to have a basis for developing the 
horizontal aggregation.

horizontal aggregation is collecting values in a ROW based on some grouping 
criterion and displaying it in horizontal manner. vertical aggregation is 
collecting values in a COLUMN based on some grouping criterion.

thank you so much!

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