SQL Update - Multiple Columns

问题

I would like to update multiple columns in a table based on values from a second table using a Select statement to obtain the values like this:

UPDATE tbl1 
SET (col1, col2, col3) = (SELECT colA, colB, colC 
                          FROM tbl2 
                          WHERE tbl2.id = 'someid') 
WHERE tbl1.id = 'differentid'

However, it doesn't seem as though it's possible to 'SET' more than one column name - are there alternatives rather than writing separate update statements for each column?

UPDATE tbl1 
SET col1 = (SELECT colA FROM tbl2 WHERE tbl2.id = 'someid') 
WHERE tbl1.id = 'differentid'

UPDATE tbl1 
SET col2 = (SELECT colB FROM tbl2 WHERE tbl2.id = 'someid') 
WHERE tbl1.id = 'differentid'

UPDATE tbl1 
SET col3 = (SELECT colC FROM tbl2 WHERE tbl2.id = 'someid') 
WHERE tbl1.id = 'differentid'

回答1:

update tbl1
set col1 = a.col1, col2 = a.col2, col3 = a.col3
from tbl2 a
where tbl1.Id = 'someid'
and a.Id = 'differentid'

回答2:

This should work -

    Update Tbl1 
    SET 
    Col1 = B.ColA,
    Col2 = B.ColB,
    Col3 = B.ColC
    FROM
    Tbl2 B
    Where
    B.Id = 'Someid'

来源：https://stackoverflow.com/questions/15881487/sql-update-multiple-columns