Conditional sum in SQL Server -

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i have table in mssql:

id   op1   op2  op3 330   0     0    1 331   1     0    0 332   3     2    0

op's options. there can go 1 9, 0 means question not answer.

how can "sum" in column called "answered", so:

id   op1   op2  op3  t 330   0     0    1   1 331   1     0    0   1 332   3     2    0   2

a value on 0, means answered.

i try case when, if stateme

use case:

select id, op1, op2, op3,         (case when op1 > 0 1 else 0 end +         case when op2 > 0 1 else 0 end +         case when op3 > 0 1 else 0 end) t mytable

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