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[ ] (Wildcard - Character(s) to Match) (Transact-SQL)

Matches any single character within the specified range or set that is specified between the brackets. These wildcard characters can be used in string comparisons that involve pattern matching, such as LIKE and PATINDEX.

Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.

The following example uses the [] operator to find the IDs and names of all Adventure Works employees who have addresses with a four-digit postal code.

USE AdventureWorks2012;
GO 
SELECT e.BusinessEntityID, p.FirstName, p.LastName, a.PostalCode
FROM HumanResources.Employee AS e
INNER JOIN Person.Person AS p ON e.BusinessEntityID = p.BusinessEntityID
INNER JOIN Person.BusinessEntityAddress AS ea ON e.BusinessEntityID = ea.BusinessEntityID
INNER JOIN Person.Address AS a ON a.AddressID = ea.AddressID
WHERE a.PostalCode LIKE '[0-9][0-9][0-9][0-9]';

Here is the result set:

EmployeeID      FirstName      LastName      PostalCode
----------      ---------      ---------     ----------
290             Lynn           Tsoflias      3000

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