Table 1:

FIELD1 FIELD2 FIELD3 FIELD4 FIELD5 FIELD6(UNIQUE, PK)
------------------------------------------
  null   1      2      3      4      8 
  null   1      1      1      1      9


Table 2:

FIELD1 FIELD2 FIELD3 FIELD4 FIELD5
----------------------------------
  3      1     2      3       4
  9      1     1      1       1
  4      1     1      1       1
  5      1     2      3       4


From this, I would like to obtain

Table 1:

FIELD1 FIELD2 FIELD3 FIELD4 FIELD5 FIELD6
-------------------------------------------
  3      1      2      3       4     8
  5      1      2      3       4     8
  9      1      1      1       1     9
  4      1      1      1       1     9