sql server - SQL View - add default values if null? -

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i'm generating view, , want populate cells pre-defined value if null.

the select view is:

select a_case.id,      r1.type referred_by_1,     r1.type referred_by_2,     r1.type referred_by_3 dbo.caseinfo a_case left join     dbo.referrer r1 on p.id = r1.case_id , r1.seq = 1 left join     dbo.referrer r2 on p.id = r2.case_id , r2.seq = 2 left join     dbo.referrer r3 on p.id = r3.case_id , r3.seq = 3

the referrers optional, , if not specified, need populate field 'nd'.

i think maybe should using case when, i'm not sure how integrate existing select...

any advice gratefully received! - l

you can use isnull:

select a_case.id,           isnull(r1.type, 'nd') referred_by_1,          isnull(r2.type, 'nd') referred_by_2,          isnull(r3.type, 'nd') referred_by_3  ...

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