I'm not sure what You ment but something like
select "T1"."EMPID", "T1"."DATEFROM", "T1"."DATETO", "CC", "SALARY" FROM
"DK"."T1" AS T1 INNER JOIN "DK"."T2" AS T2 ON
"T1"."EMPID" = "T2"."EMPID" AND "T1"."DATEFROM" BETWEEN "T2"."DATEFROM" AND "T2"."DATETO"
UNION
select "T1"."EMPID", "T1"."DATEFROM", "T1"."DATETO", "CC", "SALARY" FROM
"DK"."T1" AS T1 INNER JOIN "DK"."T2" AS T2 ON
"T1"."EMPID" = "T2"."EMPID" AND "T1"."DATETO" BETWEEN "T2"."DATEFROM" AND "T2"."DATETO"
Next time please provide CREATE Table statements and Insert Value statements
and also elaborate some more on requirement
Hope this helps