Update database table from a work area

Question

hi!
I have a workarea that is like the corresponding database table. There are a lot of fields so I dont want to update each field with an UPDATE but instead I want to do som sort of:
UPDATE dbase_table
FROM work_area
WHERE dbase_table-primary_key = work_area-primary_key
I could only find a statement called UPDATE dbase_table FROM  work_area but I dont understand how without specifying a WHERE clause it knows which rows to update.
regards
Baran

Answer 1

UPDATE  dbtab      FROM wa. or
UPDATE (dbtabname) FROM wa.
Extras:
1. ... CLIENT SPECIFIED
2. ... CONNECTION con
Effect
Changes one single line in a database table, using a primary key to identify the line and taking the values to be changed from the specified work area, wa. The data is read out of wa from left to right, matching the line structure of the database table dbtab. The structure of wa remains unchanged. This means that wa must be at least as wide (see DATA) as the line structure of dbtab, and have the same alignment. Otherwise, a runtime error occurs.
If either the database table, dbtab, or the work area, wa, contain Strings, wa must be compatible with the line structure of dbtab.
Example
Changing the telephone number of the customer with customer number '12400177' in the current client:
DATA   wa TYPE scustom.
SELECT SINGLE * FROM scustom INTO wa
  WHERE id = '12400177'.
wa-telephone = '06201/44889'.
UPDATE scustom FROM wa.
When the command has been executed, the system field SY-DBCNT contains the number of updated lines (0 or 1).
Examples
Update discount for the customer with the customer number '00017777' to 3 percent (in the current client):
DATA: wa TYPE scustom.
SELECT SINGLE * FROM scustom INTO wa
  WHERE id = '00017777'.
wa-discount = '003'.
UPDATE scustom FROM wa.
The Return Code is set as follows:
SY-SUBRC = 0:
The specified line has been updated.
SY-SUBRC = 4:
The system could not update any line in the table, since there is no line with the specified primary key.
BR< JAcek