Question

I have to code this logic:

UPDATE imported 
   SET col1 = 'first' 
 WHERE col2 = 'value one',
   SET col1 = 'second' 
 WHERE col2 = 'value two';

There are going to be multiple updates in one query, so I don’t want to stuff the server by doing update separately for each row

Also: if 2 conditions can be combined, like Where col2=’this’ AND col3=’that’

Answer 1

I’ve added an example of multiple conditions in a CASE statement.

UPDATE imported
SET col1 = CASE
              WHEN col2 = 'value one' THEN 'first'
              WHEN col2 = 'value two' THEN 'second'
              WHEN col2 = 'other val' AND col3 = 'condition' THEN 'third value'
           END
WHERE col2 IN ('value one', 'value two')
   OR (col2 = 'other val' AND col3 = 'condition')