Show me all grades that have at least 4 students.
CREATE TABLE Highschooler (grade VARCHAR)
SELECT grade FROM Highschooler GROUP BY grade HAVING COUNT(*) >= 4
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE Highschooler (grade VARCHAR) Question: Show me all grades that have at least 4 students. [/INST] SELECT grade FROM Highschooler GROUP BY grade HAVING COUNT(*) >= 4 </s>