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22 December, 2020

SQL WHERE Clause

 Programing Coderfunda     December 22, 2020     SQL Tutorial     No comments   

 

The SQL WHERE Clause

The WHERE clause is used to filter records.

The WHERE clause is used to extract only those records that fulfill a specified condition.

WHERE Syntax

SELECT column1, column2, ...
FROM table_name
WHERE condition;

Note: The WHERE clause is not only used in SELECT statement, it is also used in UPDATE, DELETE statement, etc.!


Demo Database

Below is a selection from the "Customers" table in the Northwind sample database:

CustomerIDCustomerNameContactNameAddressCityPostalCodeCountry
1

Alfreds FutterkisteMaria AndersObere Str. 57Berlin12209Germany
2Ana Trujillo Emparedados y heladosAna TrujilloAvda. de la Constitución 2222México D.F.05021Mexico
3Antonio Moreno TaqueríaAntonio MorenoMataderos 2312México D.F.05023Mexico
4

Around the HornThomas Hardy120 Hanover Sq.LondonWA1 1DPUK
5Berglunds snabbköpChristina BerglundBerguvsvägen 8LuleåS-958 22Sweden

1

WHERE Clause Example

The following SQL statement selects all the customers from the country "Mexico", in the "Customers" table:

Example

SELECT * FROM Customers
WHERE Country='Mexico';
Try it Yourself »

Text Fields vs. Numeric Fields

SQL requires single quotes around text values (most database systems will also allow double quotes).

However, numeric fields should not be enclosed in quotes:

Example

SELECT * FROM Customers
WHERE CustomerID=1;
Try it Yourself »

Operators in The WHERE Clause

The following operators can be used in the WHERE clause:

OperatorDescriptionExample
=EqualTry it
>Greater thanTry it
<Less thanTry it
>=Greater than or equalTry it
<=Less than or equalTry it
<>Not equal. Note: In some versions of SQL this operator may be written as !=Try it
BETWEENBetween a certain rangeTry it
LIKESearch for a patternTry it
INTo specify multiple possible values for a columnTry it

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