MYSQL, Copy selected fields from one table to another

update
  table1 t1
  join table2 t2 on t2.field = t1.field
set
  t1.field1 = t2.matchingfield
where
  t1.whatever = t2.whatever

If you mean you want to update one table's column using another table's column, then here are some options:

A join:

UPDATE table1 AS t1
  INNER JOIN table2 AS t2 ON t1.EmpoyeeNo = t2.EmployeeNo
SET t1.SomeColumn = t2.SomeColumn

Alternatively it could be a left join:

UPDATE table1 AS t1
  LEFT JOIN table2 AS t2 ON t1.EmpoyeeNo = t2.EmployeeNo
SET t1.SomeColumn = t2.SomeColumn

which would essentially empty (set to NULL) the values where no match occurred.

A subquery:

UPDATE table1
SET SomeColumn = (
  SELECT SomeColumn
  FROM table2
  WHERE EmployeeNo = table1.EmployeeNo
)

This is equivalent to the left join solution in #1.

Note that in all cases it is assumed that a row in table1 can match no more than one row in table2.

Try this

INSERT INTO `table2` (`field_name2`) SELECT `field_name` FROM `table1`

The query for copy data from one table to another is:

INSERT INTO `table2` (`field1`, `field2`)
    SELECT `field1`, `field2` FROM `table1`

If you want to copy only selected values, then use where clause in query

INSERT INTO `table2` (`field1`, `field2`)
    SELECT `field1`, `field2` FROM `table1`
    WHERE `field1` = condition

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