# UPDATE
<a name="cql.dml.update"></a>

Use the `UPDATE` statement to modify a row in a table.

**Syntax**

```
update_statement ::=  UPDATE table_name
                      [ USING update_parameter ( AND update_parameter )* ]
                      SET assignment ( ',' assignment )*
                      WHERE where_clause
                      [ IF ( EXISTS | condition ( AND condition )*) ]
update_parameter ::=  ( integer | bind_marker )
assignment       ::=  simple_selection '=' term
                     | column_name '=' column_name ( '+' | '-' ) term
                     | column_name '=' list_literal '+' column_name
simple_selection ::=  column_name
                     | column_name '[' term ']'
                     | column_name '.' `field_name
condition        ::=  simple_selection operator term
```

**Example**

```
UPDATE "myGSGKeyspace".employees_tbl SET pay_scale = 5 WHERE id = '567-89-0123' AND division = 'Marketing' ;
```

To increment a `counter`, use the following syntax. For more information, see [Counters](cql.elements.md#cql.data-types.numeric.counters).

```
UPDATE ActiveUsers SET counter = counter + 1  WHERE user = A70FE1C0-5408-4AE3-BE34-8733E5K09F14 AND action = 'click';
```

**Update parameters**

`UPDATE` supports the following values as `update_parameter`:
+ `TTL` – A time value in seconds. The maximum configurable value is 630,720,000 seconds, which is the equivalent of 20 years.
+ `TIMESTAMP` – A `bigint` value representing the number of microseconds since the standard base time known as the epoch: January 1 1970 at 00:00:00 GMT. A timestamp in Amazon Keyspaces has to fall between the range of 2 days in the past and 5 minutes in the future.

**Example**

```
UPDATE my_table (userid, time, subject, body, user)
        VALUES (B79CB3BA-745E-5D9A-8903-4A02327A7E09, 96a29100-5e25-11ec-90d7-b5d91eceda0a, 'Message', 'Hello again','205.212.123.123')
        USING TIMESTAMP '2022-11-03 13:30:54+0400';
```