SQL Code For Update Using Join Conditions?

novice to SQL (Oracle 10g)

Am trying to write code for sollowing scenario:

Have 3 tables
table1 (campaignid,promoflag)
table2 (campaignid,projectid,campaigndesc)
table3 (projectid,promoflag,projectstart,projectend)

I am to update table 1 promoflag with value from promoflag in table3

Update table1
set promoflag = table3.promoflag

I would like to make sure only appropriate record is updated therefore want to use where clause condition but the primary key for table1 and table3 are different, the only link can be found on table2.

I want to use condition where table1.campaignid=table2.campaignid and table2.projectid=table1.projectid

Have used the following without success:

Scenario 1

Update table1
SET promoflag = table3.promoflag
FROM table1
inner join table2 on table1.campaignid = table2.camapaignid
inner join table3 on table2.projectid = table3.projectID;

Error at line 1 ORA-00933: SQL command not properly ended

Scenario 2 with real table/column names

Update UA_CAMPAIGNEXTATTR
SET CFPROMOTABLE = LMUK_PROJECT_AUDIENCE_GRID.GRID_AUD_CFPROMOTABLE
FROM UA_CAMPAIGNEXTATTR,UA_CAMPAIGN,LMUK_PROJECT_AUDIENCE_GRID
WHERE
UA_CAMPAIGNEXTATTR.CAMPAIGNID = UA_CAMPAIGN.CAMPAIGNID
AND UA_CAMPAIGN.PROJECTID = LMUK_PROJECT_AUDIENCE_GRID.GRID_AUDIENCE_ID;
Error at line 2
ORA-00933: SQL command not properly ended

It appears to get block with the 'FROM' statement (was underlined in red)