sql server - sql update with aggregate functions in where clause -


i have table these fields >>>

i want number of s-id=1 >>>>relevancy value updated 2

(s-id)(relevancy) 0         null 0         null 3         2 4         null 4         null 4         null 4         null 5         2 9         null

here code:

    select s-id,count(s-id) ccc     group s-id      update ccc set relevancy=2 count(s-id)=1

but figured aggregate function can't used in clause,what should now?

update ccc set relevancy = 2  (select count(*) ccc c2 c2.[s-id] = ccc.[s-id])  = 1

demo (last row's relevancy updated 2 since 9 unique)

another option using cte count(*)over:

with cte (     select [s-id], relevancy,            cnt = count(*) on (partition [s-id])     ccc ) update cte set relevancy = 2 cnt = 1

demo


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