cql - Can't update Cassandra table in cqlsh -


i have simple table "test" set so:

cqlsh> select * "default".test;   name | address ------+------------   kim | 123 street  john | 222 street

i have cqlsh terminal open, , when try update row in table, error:

cqlsh> update "default".test set name = mark name = john if exists;  syntaxexception: line 1:38 no viable alternative @ input 'where' (..."default".test set name = [mark] where...)

not sure what's wrong command. i've tried wrapping field names/ values in quotation marks makes no difference.

always enclose string/date/timesamp value single quote

so case : 

update "default".test set name = 'mark' name = 'john' if exists;

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