_ (Wildcard - Match One Character) (Transact-SQL)
Matches any single character in a string comparison operation that involves pattern matching, such as LIKE and PATINDEX. For more information, see Pattern Matching in Search Conditions.
Examples
The following example uses the _ operator to find all the people in the Contact table, who have a three-letter first name that ends in an.
USE AdventureWorks;
GO
SELECT FirstName, LastName
FROM Person.Contact
WHERE FirstName LIKE '_an'
ORDER BY FirstName;
See Also
Reference
LIKE (Transact-SQL)
PATINDEX (Transact-SQL)
% (Wildcard - Character(s) to Match) (Transact-SQL)
[ ] (Wildcard - Character(s) to Match) (Transact-SQL)
[^] (Wildcard - Character(s) Not to Match) (Transact-SQL)