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SQL•SQL Tutorial

SQL UPDATE Statement

Flash cards

Review the key moves

1/4

Core idea

What is the main idea behind SQL UPDATE Statement?

Lesson checks

Practice each idea before moving on

Short Mimo-style checks built from this lesson's code, terms, and sequence.

1Quick choice

Which statement best captures the main point of this lesson?

2Fill blank

Complete the missing token from the example code.

___ Customers

3Order

Put the learning moves in the order that makes the concept easiest to apply.

The UPDATE statement is used to update or modify one or more records in a table.

UPDATE Multiple Records

The SQL UPDATE Statement

The UPDATE statement is used to update or modify one or more records in a table.

UPDATE Syntax

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 used in the examples:

CustomerID	CustomerName	ContactName	Address	City	PostalCode	Country
1	Alfreds Futterkiste	Maria Anders	Obere Str. 57	Berlin	12209	Germany
2	Ana Trujillo Emparedados y helados	Ana Trujillo	Avda. de la ConstituciÃ³n 2222	MÃ©xico D.F.	05021	Mexico
3	Antonio Moreno TaquerÃa	Antonio Moreno	Mataderos 2312	MÃ©xico D.F.	05023	Mexico
4	Around the Horn	Thomas Hardy	120 Hanover Sq.	London	WA1 1DP	UK
5	Berglunds snabbkÃ¶p	Christina Berglund	BerguvsvÃ¤gen 8	LuleÃ¥	S-958 22	Sweden

UPDATE Table

The following SQL updates the record with CustomerID = 1, with a new contact person AND a new city.

Example

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

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

CustomerID	CustomerName	ContactName	Address	City	PostalCode	Country
1	Alfreds Futterkiste	Alfred Schmidt	Obere Str. 57	Frankfurt	12209	Germany
2	Ana Trujillo Emparedados y helados	Ana Trujillo	Avda. de la ConstituciÃ³n 2222	MÃ©xico D.F.	05021	Mexico
3	Antonio Moreno TaquerÃa	Antonio Moreno	Mataderos 2312	MÃ©xico D.F.	05023	Mexico
4	Around the Horn	Thomas Hardy	120 Hanover Sq.	London	WA1 1DP	UK
5	Berglunds snabbkÃ¶p	Christina Berglund	BerguvsvÃ¤gen 8	LuleÃ¥	S-958 22	Sweden

UPDATE Multiple Records

The WHERE clause determines which records that will be updated.

The following SQL will update the ContactName to "Juan" for ALL records where country is "Mexico":

Example

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

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

CustomerID	CustomerName	ContactName	Address	City	PostalCode	Country
1	Alfreds Futterkiste	Alfred Schmidt	Obere Str. 57	Frankfurt	12209	Germany
2	Ana Trujillo Emparedados y helados	Juan	Avda. de la ConstituciÃ³n 2222	MÃ©xico D.F.	05021	Mexico
3	Antonio Moreno TaquerÃa	Juan	Mataderos 2312	MÃ©xico D.F.	05023	Mexico
4	Around the Horn	Thomas Hardy	120 Hanover Sq.	London	WA1 1DP	UK
5	Berglunds snabbkÃ¶p	Christina Berglund	BerguvsvÃ¤gen 8	LuleÃ¥	S-958 22	Sweden

Update Warning!

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

The following SQL will update the ContactName to "Juan" for ALL records:

Example

UPDATE Customers
SET ContactName='Juan';

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

CustomerID	CustomerName	ContactName	Address	City	PostalCode	Country
1	Alfreds Futterkiste	Juan	Obere Str. 57	Frankfurt	12209	Germany
2	Ana Trujillo Emparedados y helados	Juan	Avda. de la ConstituciÃ³n 2222	MÃ©xico D.F.	05021	Mexico
3	Antonio Moreno TaquerÃa	Juan	Mataderos 2312	MÃ©xico D.F.	05023	Mexico
4	Around the Horn	Juan	120 Hanover Sq.	London	WA1 1DP	UK
5	Berglunds snabbkÃ¶p	Juan	BerguvsvÃ¤gen 8	LuleÃ¥	S-958 22	Sweden

SQL NULL Values

SQL DELETE Statement

Loading lesson path

SQL•SQL Tutorial

SQL UPDATE Statement

Flash cards

Review the key moves

1/4

Core idea

What is the main idea behind SQL UPDATE Statement?

Lesson checks

Practice each idea before moving on

Short Mimo-style checks built from this lesson's code, terms, and sequence.

1Quick choice

Which statement best captures the main point of this lesson?

2Fill blank

Complete the missing token from the example code.

___ Customers

3Order

Put the learning moves in the order that makes the concept easiest to apply.

The UPDATE statement is used to update or modify one or more records in a table.

UPDATE Multiple Records

The SQL UPDATE Statement

The UPDATE statement is used to update or modify one or more records in a table.

UPDATE Syntax

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

Note

Demo Database

Below is a selection from the Customers table used in the examples:

CustomerID	CustomerName	ContactName	Address	City	PostalCode	Country
1	Alfreds Futterkiste	Maria Anders	Obere Str. 57	Berlin	12209	Germany
2	Ana Trujillo Emparedados y helados	Ana Trujillo	Avda. de la ConstituciÃ³n 2222	MÃ©xico D.F.	05021	Mexico
3	Antonio Moreno TaquerÃa	Antonio Moreno	Mataderos 2312	MÃ©xico D.F.	05023	Mexico
4	Around the Horn	Thomas Hardy	120 Hanover Sq.	London	WA1 1DP	UK
5	Berglunds snabbkÃ¶p	Christina Berglund	BerguvsvÃ¤gen 8	LuleÃ¥	S-958 22	Sweden

UPDATE Table

The following SQL updates the record with CustomerID = 1, with a new contact person AND a new city.

Example

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

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

CustomerID	CustomerName	ContactName	Address	City	PostalCode	Country
1	Alfreds Futterkiste	Alfred Schmidt	Obere Str. 57	Frankfurt	12209	Germany
2	Ana Trujillo Emparedados y helados	Ana Trujillo	Avda. de la ConstituciÃ³n 2222	MÃ©xico D.F.	05021	Mexico
3	Antonio Moreno TaquerÃa	Antonio Moreno	Mataderos 2312	MÃ©xico D.F.	05023	Mexico
4	Around the Horn	Thomas Hardy	120 Hanover Sq.	London	WA1 1DP	UK
5	Berglunds snabbkÃ¶p	Christina Berglund	BerguvsvÃ¤gen 8	LuleÃ¥	S-958 22	Sweden

UPDATE Multiple Records

The WHERE clause determines which records that will be updated.

The following SQL will update the ContactName to "Juan" for ALL records where country is "Mexico":

Example

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

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

CustomerID	CustomerName	ContactName	Address	City	PostalCode	Country
1	Alfreds Futterkiste	Alfred Schmidt	Obere Str. 57	Frankfurt	12209	Germany
2	Ana Trujillo Emparedados y helados	Juan	Avda. de la ConstituciÃ³n 2222	MÃ©xico D.F.	05021	Mexico
3	Antonio Moreno TaquerÃa	Juan	Mataderos 2312	MÃ©xico D.F.	05023	Mexico
4	Around the Horn	Thomas Hardy	120 Hanover Sq.	London	WA1 1DP	UK
5	Berglunds snabbkÃ¶p	Christina Berglund	BerguvsvÃ¤gen 8	LuleÃ¥	S-958 22	Sweden

Update Warning!

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

The following SQL will update the ContactName to "Juan" for ALL records:

Example

UPDATE Customers
SET ContactName='Juan';

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

CustomerID	CustomerName	ContactName	Address	City	PostalCode	Country
1	Alfreds Futterkiste	Juan	Obere Str. 57	Frankfurt	12209	Germany
2	Ana Trujillo Emparedados y helados	Juan	Avda. de la ConstituciÃ³n 2222	MÃ©xico D.F.	05021	Mexico
3	Antonio Moreno TaquerÃa	Juan	Mataderos 2312	MÃ©xico D.F.	05023	Mexico
4	Around the Horn	Juan	120 Hanover Sq.	London	WA1 1DP	UK
5	Berglunds snabbkÃ¶p	Juan	BerguvsvÃ¤gen 8	LuleÃ¥	S-958 22	Sweden

SQL NULL Values

SQL DELETE Statement