hello my friend... i want to ask:
how to insert the string,but not change the string position ?
example:

i want to insert in the left position

"abc" in " test"

the results "abc test"

UPDATE mytable SET mycolumn = concat("abc", mycolumn)
WHERE something = somevalue

sorry my friend my problem is how iam insert the some string but not change the position that string:

exm:
1. insert "abc" in " example" => the result "abcexample"
or
2. insert "abc" in "example" => the result "abcmple"

? don't understand what you are trying to achieve
you could do it in SQL
you could do it in your front end