sql - Update and self join -

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i want update blank name column in client table using non-blank column same client number. know how should modify below sql? thanks,

update client     set name=(select name client (name not null , name<>'') ) client c1, client c2 (name null or name='') , c1.client_no=c2.client_no

i recommend using window functions purpose:

with toupdate (       select c.*, max(name) on (partition client_no) maxname       client c      ) update toupdate     set name = maxname     name null or name = '';

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