sql server - how to check if a field of a column is null or not , if NULL then update -

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create procedure:-i have table named evaluator column tag. need find if column tag has null values or not. if update values present in tag table. 

tag tabel:    tag_id  tag_name   tag     1        c++       cp     2        oracle    orc     3        java      jv

evaluator table:

   eval_id   eval_name   domain     specialization   tag       1        john       database      oracle         null      2        matthew     programming    java          jv      3        edward     programming    c++           null

generally can update empty tag values this

update evaluator set tag = 'some_tag' tag null

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