To broaden the selections of a structured query language (SQL-SELECT) statement, wildcard characters, the percent sign (%) and the underscore (_), can be used.
_ (underscore) character can be used as a wildcard for any single character in a pattern match.
Find all employees whose Fname start with 'j' and end with 'n' and has exactly 3 characters in Fname.
SELECT * FROM Employees WHERE FName LIKE 'j_n'
_ (underscore) character can also be used more than once as a wild card to match patterns.
For example, this pattern would match "jon", "jan", "jen", etc.
These names will not be shown "jn","john","jordan", "justin", "jason", "julian", "jillian", "joann" because in our query one underscore is used and it can skip exactly one character, so result must be of 3 character Fname.
For example, this pattern would match "LaSt", "LoSt", "HaLt", etc.
SELECT * FROM Employees WHERE FName LIKE '_A_T'