quarry to update name in a row?

Answer 1

Update TableName
set ColumnName=Value
where[condition];

Answer 2

for ex:
Table name Student

Columns and it's data
studentId studentname
1 Ajay
if you want to update studentname Ajay to Jay then query is

update student
set studentname='Jay'
where studentID=1;

Result:

studentId studentname
1 Jay