replace certain element with other value in sql code example

Example 1: sql query with replace function

##sql query with replace function
#syntax
UPDATE tableName
SET  column_name = REPLACE(column_name, 'fromStringValue', 'toStringValue');

#Example 
Update  tbl_employee
Set designation = REPLACE(designation, 'SEO', 'Developer');

Example 2: stuff and replace in sql

STUFF Function: This function is used to
overwrite existing character or inserts
a string into another string. 

REPLACE function: This function is used 
to replace the existing characters
of all the occurrences.