[ ] (Wildcard - Character(s) to Match) (Transact-SQL)
Applies To: SQL Server 2014, SQL Server 2016 Preview
Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).
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, Azure SQL Data Warehouse Public Preview.
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