internal table

hi,

may i know how to move fieldc in temp internal table to main internal table fieldc and overrite the fieldc in main internal table when fielda and fieldb are the same?

notice that sometimes temp table entry may less. for example fielda 124 is only 1 entry in temp but want to update the corresponding entry in main internal table which has 2 entries.

main internal table

fielda fieldb fieldc

123 10 999

123 10 999

123 10 999

124 10 sss

124 10 sss

temp internal table

fielda fieldb fieldc

123 10 999

123 10 998

123 10 997

124 10 see

thanks