Question

I have two tables in a mysql database. macs and deviceinventory i want to updat macs table column name deviceid =1 but update those reords which not found in deviceinventory table column device id i use this query but it give error

UPDATE macs SET deviceid = 1 
WHERE deviceid = (SELECT deviceid FROM macs NOT IN (
                     SELECT * FROM deviceinventory.`deviceid`
                 )) ;

Answer 1

try this:

UPDATE 
   macs 
SET 
   deviceid = 1 
WHERE 
   deviceid NOT IN 
     (SELECT deviceid FROM deviceinventory);