The SQL UPDATE statement is used to modify existing rows in a table by setting column values to new values. It requires specifying the table name, the column names and values to update, and optionally a WHERE clause to identify which rows to update. Without a WHERE clause, all rows in the table will be updated. Examples are provided to update a single employee's location or increase all employee salaries by 20%.

1. 8/10/13 SQL Update Statement
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SQL UPDATE Statement
The UPDATE Statement is used to modify the existing rows in a table.
The Syntax for SQL UPDATE Command is:
UPDATE table_name
SET column_name1 = value1,
column_name2 = value2, ...
[WHERE condition]
table_name - the table name which has to be updated.
column_name1, column_name2.. - the columns that gets changed.
value1, value2... - are the new values.
NOTE:In the Update statement, WHERE clause identifies the rows that get affected. If you do not include the
WHERE clause, column values for all the rows get affected.
For Example: To update the location of an employee, the sql update query would be like,
UPDATE employee
SET location ='Mysore'
WHERE id = 101;
To change the salaries of all the employees, the query would be,
UPDATE employee
SET salary = salary + (salary * 0.2);