使用join在oracle语句中进行sql更新

Question

please where is the error in this statement, I want to update a field1 of table 1 with field2 of table 2 joining both tables on a field 3

UPDATE 
     (SELECT IP_ANAGRAFICACOMPLESSO.id_complesso, COORDOK6.AZIENDA , IP_ANAGRAFICACOMPLESSO.COORD_GB_E,  COORDOK6.WGSE 
      FROM ip_anagraficacomplesso 
      INNER JOIN COORDOK6  ON IP_ANAGRAFICACOMPLESSO.ID_COMPLESSO = COORDOK6.AZIENDA )
SET IP_ANAGRAFICACOMPLESSO.COORD_GB_E = COORDOK6.WGSE

Thanks a lot

Answer 1

Not sure which flavor of SQL you are using, but at least in TSQL you would need to rearrange it so the SELECT comes after the SET

UPDATE IP
SET IP.COORD_GB_E = C.WGSE
FROM IP_ANAGRAFLICACOMPLESSO IP
    INNER JOIN COORDOK6 C ON IP.ID_COMPLESSO = C.AZIENDA

Answer 2

To perform such an UPDATE in ORACLE, your query should be as below. Always remember to create the appropriate join or else you might end up updating the wrong records.

 update DAILY D
  set
    (
      D.DEPARTMENT_CODE,
      D.COSTCENTRE_CODE,
      D.USER_ID
    )
    =
    (select distinct DEPT.DEPT_CODE,
      DEPT.CENTRE_CODE,
      PRT.EMP_ID
    from EMP PRT
    inner join DEPT  DEPT
    on DEPT.DEPARTMENT_ID = PRT.DEPARTMENT_ID
    where PRT.LOGIN_ID     = D.LOGIN_ID
    );

Answer 3

According to this URL, the syntax is:

http://docs.oracle.com/cd/B19306_01/appdev.102/b14261/update_statement.htm

(ORACLE-provided syntax example):

   UPDATE employee_temp SET (first_name, last_name) =
  (SELECT first_name, last_name FROM employees
   WHERE employee_id = employee_temp.employee_id);

Which would be something like this: You can only select one column from the SELECT subquery - make sure the subquery is a valid INNER JOIN with respect to your column and table names:

 UPDATE  COORD_GB_E
 SET     IP_ANAGRAFICACOMPLESSO =

 (SELECT COORDOK6.WGSE 
  FROM   ip_anagraficacomplesso INNER JOIN COORDOK6  
  ON     IP_ANAGRAFICACOMPLESSO.ID_COMPLESSO = COORDOK6.AZIENDA );

This documentation states if there is one column being updated to omit the parentheses around the updated column.