Question

i have two tables like:

table 1:

|A|B|C|D|E|F|G|H|I|J|

table 2:

|A|C|D|E|G|H|J|K|L|M|N|O|P|

i have to copy some columns from table 2 to table 1.
What i try is:

INSERT INTO `table 1` (`C`,`D`,`E`,`G`,`J`)
     SELECT `C`,`D`,`E`,`G`,`J` FROM `table 2` WHERE 
     `table 1`.`A` = `table 2`.`A`;

but it result :

#1054 - Unknown column 'table 1.A' in 'where clause'

where is the error? can someone help me?

MY ERROR IS THAT I DON’T HAVE TO INSERT NEW ROWS, BUT UPDATE THE ROWS THAT MATCH THE COLUMN A… in which way i have to edit my query? thanks!

Answer 1

Try this::

INSERT INTO `table1` (`C`,`D`,`E`,`G`,`J`) VALUES
     (SELECT `C`,`D`,`E`,`G`,`J` FROM `table2` WHERE 
     `table1`.`A` = `table2`.`A`);

Edited::

If you only need to update then ::

    update table1 
    inner join table2 on table1.A = table2.A
    set 
    table1.C=table2.C, 
    table1.D=table2.D,
    table1.E=table2.E, 
    table1.G=table2.G,
    table1.J=table2.J
    WHERE 1=1
    ;