SQL Server: join If -


i have below table. need create join ownername captured first , if null use secondaryname

from table  left join hr on a.ownername = hr.id --or a.secondaryname = hr.id  not work , hr.active = y

table a

 id     secondaryname    ownername      1        jaj              null           2        jat              jat  3        joa              nel

table hr table

 role            id     active  senior          jat     y  senior          nel     y  specialist      jaj     y

you can use coalesce

left join hr on coalesce(a.ownername, a.secondaryname) = hr.id

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