Split string into row - sql

Question

I am using MySQL.
I have a table named "class", the "class" table has three columns name , year and class_code like following:
Class table:
Now I would like to use the above table to create a new table named "temp", which contains class_code and value columns.
The rule is that each string value in each column field of a row of the above "class" table will be split into words, and each word will be inserted to the "temp" table as value column of a temp table record like following:
temp table:
I am using MySQL.
Is it possible to generate the "temp" table purely by using SQL statement and how?
That's :
CREATE TABLE temp;
ALTER TABLE temp DISABLE KEYS;
INSERT INTO ...(how to split the string value of each field in "class" table and insert to "temp" table??? )
P.S.:
I used a simple equal length string as a value, but the actually case has very random length string, and the number of words in each string is random also.

Answer 1

CREATE TABLE new_table
SELECT SUBSTRING(name, 1, 4) as field, class_code FROM old_table
UNION
SELECT SUBSTRING(name, 6, 4) as field, class_code FROM old_table
UNION
SELECT SUBSTRING(name, 11, 4) as field, class_code FROM old_table
UNION
SELECT SUBSTRING(year, 1, 4) as field, class_code FROM old_table
UNION
SELECT SUBSTRING(year, 6, 4) as field, class_code FROM old_table

Answer 2

You have to write a function for string splitting in MySql as
CREATE FUNCTION SPLIT_STR(
x VARCHAR(255),
delim VARCHAR(12),
pos INT
)
RETURNS VARCHAR(255)
RETURN REPLACE(SUBSTRING(SUBSTRING_INDEX(x, delim, pos),
LENGTH(SUBSTRING_INDEX(x, delim, pos -1)) + 1),
delim, '');
And use it to split the values and do the assigning the splitted values and inserting in to table in a SP.For more information refer to the MySQL Split String