UPDATE 

    t1

SET 

    t1.c1 = t2.c2,

    t1.c2 = expression,

    ...   

FROM 

    t1

    [INNER | LEFT] JOIN t2 ON join_predicate

WHERE 

    where_predicate;

update A

  set A.first_name = B.first_name,A.last_name = B.last_name

   from dbo.tblA as A inner join dbo.tblB as B

on A.emp_id = B.emp_id

​

----

​

UPDATE A

SET A.<column_name> = B.<column_name>, ...

FROM <table_name> A

[ INNER | LEFT ] JOIN <table_name1> B ON <join_predicate>

[ WHERE Condition(s) ]

update employee

    set employee.salary = 13000

    from employee

    inner join Company

    on Company.id = employee.Company_id 

    where Company.id=3

UPDATE 

    t1

SET 

    t1.c1 = t2.c2,

    t1.c2 = expression,

    ...   

FROM 

    t1

    [INNER | LEFT] JOIN t2 ON join_predicate

WHERE 

    where_predicate;

-- update with a join

​

UPDATE A

SET foo = B.bar

FROM TableA A

JOIN TableB B

    ON A.col1 = B.colx

WHERE ...

MySQL:

​

update ud u

inner join sale s on

    u.id = s.udid

set u.assid = s.assid

​

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

SQL Server:

​

update u

set u.assid = s.assid

from ud u

    inner join sale s on

        u.id = s.udid

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

PostgreSQL:

​

update ud

  set assid = s.assid

from sale s 

where ud.id = s.udid;

​

//mysql

UPDATE store_fars

        INNER JOIN

   fake ON store_fars.id = fake.id

SET 

    fake.id = store_fars.id

update a

join b 

on a.a_id=b.b_id 

set b.is_active = 1 

where ....;