sql server - SQL Update subquery returns no results run different sub query -


i trying update , i'm having problems (using microsoft sql server)

update mytable    set myvalue=    (        (select myvalue someothertable         someothertable.id=mytable.id)    )    table mytable    mytable.custname='test'

basically subquery return no results if happen want call different subquery:

(select myvalue oldtable oldtable.id=mytable.id)

well, run second query first, , then, first query. in way, override values when first query can bring them, , when (original) first query won't bring result, have result of first query.

also, think have typo in second query table name.

update mytable    set myvalue=    (        select myvalue oldtable         oldtable.id=mytable.id    )    table mytable    mytable.custname='test'    , exists (select 1 oldtable         oldtable.id=mytable.id)   update mytable    set myvalue=    (        select myvalue someothertable         someothertable.id=mytable.id    )    table mytable    mytable.custname='test'    , exists ( select 1 someothertable         someothertable.id=mytable.id)

edit: need add exists clause, cause if not update null values, think


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