sql - How to store multiple values from select subquery -

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hi having problem in following query:

update tbl  set somecol = somecol  key = (select key                tbl              group key               having count(*) > 1)     , time = (select max(time) tbl)

above query works fine when there 1 key. if there more 1 keys query doesn't work. how store multiple values select subquery? time column can multiple. new sql. please guide. in advance.

use in predicate:

update tbl  set somecol = somecol  key in (select key                tbl              group key               having count(*) > 1)     , time = (select max(time) tbl)

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