UPDATE Statement is used to update/change the
data of row(s) only, we can use certain condition(s)using WHER clause
UPDATE <Table-Name> SET <Column-Name(s)> WHERE <Column-Name> <Condition(s)>
Example: UPDATE Student SET DepartmentName='MCA' WHERE ClassId=3
ALTER: ALTER is used alter/change the SQL Table structure
1) Alter can be used to change the table column name, column type
2) Alter also used to add new column or contraint to the table
3) It also used to delete (drop) column or contraint from the table