Update Table 1 To Table 2 Depending Date Time + ID

need help please on update only if .

i need to update only the field "val_holiday " (in table B from table A)

and olso to check on table B the "ID" + "new_date" only if exist

and update the field "val_holiday " (in table B)

and at the end of update change the field "field_check_update_if _ok" from 0 to 1
only the row that update in table B


select from table A

update table B

WHERE ..........................HOW ?




----------------------------------------------------------------- table A

ID fname new_date val_holiday field_check_update_if _ok

---------------------------------------------------------------------------------------------------

111 aaaa 15/03/2008 999 0

111 aaaa 16/03/2008 888 0

111 aaaa 18/03/2008 77 0

111 aaaa 19/03/2008 9 0

111 aaaa 20/03/2008 111 0

111 aaaa 21/03/2008 12 0



222 bbb 02/05/2008 15 0

222 bbb 03/05/2008 16 0

222 bbb 04/05/2008 9 0

222 bbb 05/05/2008 3 0

222 bbb 06/05/2008 90 0

222 bbb 07/05/2008 3 0

222 bbb 08/05/2008 3 0

222 bbb 09/05/2008 3 0



333 ccc 03/04/2008 4 0

333 ccc 04/04/2008 4 0



----------------------------------------------------------------- table B

ID fname new_date val_holiday

----------------------------------------------------

111 aaaa 15/03/2008 1

111 aaaa 16/03/2008 1

111 aaaa 18/03/2008 1

111 aaaa 19/03/2008 1

111 aaaa 20/03/2008 1

111 aaaa 21/03/2008 1



222 bbb 02/05/2008 3

222 bbb 03/05/2008 3

222 bbb 04/05/2008 3

222 bbb 05/05/2008 3

222 bbb 06/05/2008 3

222 bbb 07/05/2008 3

222 bbb 08/05/2008 3

222 bbb 09/05/2008 3



333 ccc 03/04/2008 4

333 ccc 04/04/2008 4

------------------------------------------------------------------------------

TNX for the help and for all