oracle - "Single-row subquery returns more than one row" in Update statement -


i've been struggling couple of days work out how make update statement work. select statement appears work expected, when try update column values ora-01427 single-row subquery returns more 1 row error.

here's code:

update tbl_metrics set act_end_time = (with base (select caseid, entry_timestamp        activity       act_id in (100, 700, 300)       )   select t1.entry_timestamp base t1, tbl_metrics t2 t1.caseid = t2.caseid , t2.act_start_time < (select min(t1.entry_timestamp) base t1 t1.caseid = t2.caseid))

the idea tbl_metrics.act_end_time column updated lowest entry_timestamp value activity table activity.caseid=tbl_metrics.caseid , activity.entry_timestamp>tbl_metrics.act_start_time , activity.act_id 100, 700, or 300.

i think should this:

update tbl_metrics t2 set act_end_time =      (select min(t1.entry_timestamp)      activity t1      act_id in (100, 700, 300)         , t1.entry_timestamp > t2.act_start_time         , t1.caseid = t2.caseid)

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