You can't specify target table for update in FROM clause

Question

I have a simple mysql table:

CREATE TABLE IF NOT EXISTS `pers` (
  `persID` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(35) NOT NULL,
  `gehalt` int(11         


        

Answer 1

If you are trying to read fieldA from tableA and save it on fieldB on the same table, when fieldc = fieldd you might want consider this.

UPDATE tableA,
    tableA AS tableA_1 
SET 
    tableA.fieldB= tableA_1.filedA
WHERE
    (((tableA.conditionFild) = 'condition')
        AND ((tableA.fieldc) = tableA_1.fieldd));

Above code copies the value from fieldA to fieldB when condition-field met your condition. this also works in ADO (e.g access )

source: tried myself