给出一个学生成绩表,列 StudentID, CourseID, 和 Grade, 写一个 SQL 查询,找到每个学生的平均成绩, 圆到最近的整数.
Here's a SQL query that can give you the average grade for each student, rounded to the nearest integer:

```
SELECT StudentID, ROUND(AVG(Grade)) AS AverageGrade
FROM student_grades
GROUP BY StudentID;
```

This query uses the `AVG()` function to calculate the average grade for each student, and the `ROUND()` function to round the result to the nearest integer. The `GROUP BY` clause is used to group the results by StudentID.