[ ] (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. For more information, see Pattern Matching in Search Conditions.
Examples
The following example uses the [] operator to return all Adventure Works employees who have addresses with a four-digit postal code.
USE AdventureWorks2008R2;
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]';
GO
Here is the result set:
EmployeeID FirstName LastName PostalCode
---------- --------- --------- ----------
290 Lynn Tsoflias 3000