Do you just want an addition?
select t.*, valu1 + valu2 + valu3 + valu4 as res from mytable t
Note that if any of the column has a
null value, the addition returns a
null value as well. You might want to avoid that, so:
select t.*, coalesce(valu1, 0) + coalesce(valu2, 0) + coalesce(valu3, 0) + coalesce(valu4, 0) as res from mytable t
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