Row Value Constructor

select *  from sysibm.sysdummy1 where  (1, 2, 3 ) = (1, 2, 3) ;    -- true   
a1=b1 and a2=b2 and a3=b3

select *  from sysibm.sysdummy1 where  (1, 2, 3 ) = (1, 2, 4) ;    -- false

select *  from sysibm.sysdummy1 where  (1, 2, 3 ) != (1, 2, 4) ;    -- true
a1!=b1 or a2!=b2 or a3!=b3

select *  from sysibm.sysdummy1 where  (1, 2, 3 ) != (1, 2, 3) ;    -- false

https://www.ibm.com/support/knowledgecenter/en/SSPK3V_7.0.0/com.ibm.swg.im.soliddb.sql.doc/doc/row.value.constructors.html