Advanced MySql Query: Update table with info from another table

Question

I would like to update a table in mySql with data from another table.

I have two tables \"people\" and \"business\". The people table is linked to the business tabl

Answer 1

Note, if sort_order is an INT, then don't use '1' - use 1:

UPDATE business b
JOIN People p
ON p.business_id = b.business_id
AND p.sort_order = '1'
SET b.email = p.email
WHERE b.email = '';

Answer 2

Try this, it works fine for me.

Update table a, table b
Set a.importantField = b.importantField,
a.importantField2 = b.importantField2
where a.matchedfield = b.matchedfield;

Answer 3

UPDATE business b, people p
   SET b.email = p.email
 WHERE b.business_id = p.business_id
   AND p.sort_order = '1'
   AND b.email = ''