The Update Statement
Once we have the information in the table, we might find that there is a need to modify the data. To do so, we can use the UPDATE command. The syntax for this is

UPDATE "table_name"
SET "column_1" = [new value]
WHERE {condition}

It is easiest to use an example. Say we currently have a table as below:

Table Store_Information

store_name Sales Date
Los Angeles $1500 Jan-05-1999
San Diego $250 Jan-07-1999
Los Angeles $300 Jan-08-1999
Boston $700 Jan-08-1999

We find that the sales for Los Angeles on 01/08/1999 is actually $500 instead of $300, and we need to update that particular entry. To do so, we use the following SQL:

UPDATE Store_Information
SET Sales = 500
WHERE store_name = "Los Angeles"
AND Date = "Jan-08-1999"

The resulting table would look like

Table Store_Information

store_name Sales Date
Los Angeles $1500 Jan-05-1999
San Diego $250 Jan-07-1999
Los Angeles $500 Jan-08-1999
Boston $700 Jan-08-1999

In this case, there is only one row that satisfies the condition in the WHERE clause. If there are two rows that satisfy the condition, both rows will be modified.

It is also possible to UPDATE multiple columns at the same time. The syntax in this case would look like the following:

UPDATE "table_name"
SET column_1 = [value1], column_2 = [value2]
WHERE {condition}

The UPDATE statement is used to modify the data in a table.
Syntax

UPDATE table_name
SET column_name = new_value
WHERE column_name = some_value

Update one Column in a Row

We want to add a first name to the person with a last name of "Rasmussen":

UPDATE Person SET FirstName = 'Nina'
WHERE LastName = 'Rasmussen'

Result:
LastName FirstName Address City
Nilsen Fred Kirkegt 56 Stavanger
Rasmussen Nina Storgt 67

Update several Columns in a Row

We want to change the address and add the name of the city:

UPDATE Person
SET Address = 'Stien 12', City = 'Stavanger'
WHERE LastName = 'Rasmussen'

Result:
LastName FirstName Address City
Nilsen Fred Kirkegt 56 Stavanger
Rasmussen Nina Stien 12 Stavanger