sql cross join - what use has anyone found for it? [closed]

Answer 1

I had combinations of am insolvency field from my source data. There are 5 distinct types but the data had combinations of 2 of these. So I created lookup table of the 5 distinct values then used a cross join for an insert statement to fill out the rest. like so

insert into LK_Insolvency (code,value)

select a.code+b.code, a.value+' '+b.value 
from LK_Insolvency a
cross join LK_Insolvency b
where a.code <> b.code <--this makes sure the x product of the value with itself is not used as this does not appear in the source data.