_ (Wildcard - Match One Character) (Transact-SQL)

SQL Server 2012

Matches any single character in a string comparison operation that involves pattern matching, such as LIKE and PATINDEX.

The following example uses the _ operator to find all the people in the Person table, who have a three-letter first name that ends in an.

USE AdventureWorks2012;
SELECT FirstName, LastName
FROM Person.Person
WHERE FirstName LIKE '_an'
ORDER BY FirstName;