how to use replace in sql code example

Example 1: sql replace character in string in all records

UPDATE employees 
SET 
    phone_number = REPLACE(phone_number, '.', '-');

Example 2: replace string value in sql

UPDATE tableName  SET  fieldName = REPLACE(fieldName, 'fromStringValue', 'toStringValue');

Example 3: 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.

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Sql Example