> For the complete documentation index, see [llms.txt](https://gyansetu-sql.gitbook.io/sql-programming/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gyansetu-sql.gitbook.io/sql-programming/data-manipulation-language/update-statement.md).

# UPDATE Statement

### The SQL UPDATE Statement

The UPDATE statement is used to modify the existing records in a table.

#### UPDATE Syntax

```sql
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;
```

**Note:** Be careful when updating records in a table! Notice the WHERE clause in the UPDATE statement. The WHERE clause specifies which record(s) that should be updated. If you omit the WHERE clause, all records in the table will be updated!

### Demo Database

Below is a selection from the "Customers" table :

![](https://826093633-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LS8lPNzCGPR5-DLbGXv%2F-LSf1pUcVZsR2hWUa8cy%2F-LSf29h0bpnu_5U9_l05%2Fimage.png?alt=media\&token=dfaa2a1e-707c-490a-b83b-3ac2a5aaf5d1)

### UPDATE Table

The following SQL statement updates the first customer (CustomerID = 1) with a new contact person *and* a new city.

#### Example

```sql
UPDATE Customers
SET ContactName = 'Alfred Schmidt', City= 'Frankfurt'
WHERE CustomerID = 1;
```

The selection from the "Customers" table will now look like this:

![](https://826093633-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LS8lPNzCGPR5-DLbGXv%2F-LSf1pUcVZsR2hWUa8cy%2F-LSf2KtzQz5DgIzdnfqc%2Fimage.png?alt=media\&token=29b60e1a-0949-40bc-a3b2-377aa7686e8a)

### UPDATE Multiple Records

It is the WHERE clause that determines how many records that will be updated.

The following SQL statement will update the contactname to "Juan" for all records where country is "Mexico":

#### Example

```sql
UPDATE Customers
SET ContactName='Juan'
WHERE Country='Mexico';
```

The selection from the "Customers" table will now look like this:

![](https://826093633-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LS8lPNzCGPR5-DLbGXv%2F-LSf1pUcVZsR2hWUa8cy%2F-LSf2TtbwMpGDaqUEdQ7%2Fimage.png?alt=media\&token=e9361e4f-9c75-4317-91c1-df0a8969df65)

### Update Warning!

**Be careful when updating records. If you omit the WHERE clause, ALL records will be updated!**

#### Example

```sql
UPDATE Customers
SET ContactName='Juan';
```

The selection from the "Customers" table will now look like this:

![](https://826093633-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LS8lPNzCGPR5-DLbGXv%2F-LSf1pUcVZsR2hWUa8cy%2F-LSf2bHVJx2ql5HJe-SD%2Fimage.png?alt=media\&token=ea2e71ed-2a89-4699-8c17-90642951b67b)