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create table table1 (client int); create table table2 (client int); insert into table1 (client) values (1), (2), (3); insert into table2 (client) values (2), (3), (4), (null); select client from table1 where client in (select client from table2); select t1.client, t2.client as match from table1 t1 left join table2 t2 on t1.client = t2.client where t2.client is not null; select t1.client, t2.client as match from table1 t1 inner join table2 t2 on t1.client = t2.client;

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