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select version();
version()
10.3.11-MariaDB-1:10.3.11+maria~stretch-log
 hidden batch(es)


create table tbl1 (name varchar(20))
 hidden batch(es)


insert into tbl1 values ('n1'),('n2'),('n6')
 hidden batch(es)


create table tbl2 (name varchar(20))
 hidden batch(es)


insert into tbl2 values ('n1'),('n2'),('n12')
 hidden batch(es)


select name from tbl1 except select name from tbl2
name
n6
 hidden batch(es)