_ (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.

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

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