File_1.csv
Number LUNID
1 111
2 104
3 67
4 156
File_2.csv
Number UniqueID
1 50003AC0100000000000001700003B64
2 50003AC0100000000000001800003B64
3 50003AC0100000000000001B00003B64
4 50003AC0100000000000001C00003B64
Expected Result
Number LUNID UniqueID
1 111 50003AC0100000000000001700003B64
2 104 50003AC0100000000000001800003B64
3 67 50003AC0100000000000001B00003B64
4 156 50003AC0100000000000001C00003B64