# Queries ## Joins 1. Get all batch names along with their instructor names. ```sql ``` 2. Get all students along with their batch names if present else `NULL`. ```sql ``` 3. Get all students along with their batch names. Also, fetch all the batches which have no students. ```sql ``` 4. Get all the combinations of batches and instructors. ```sql ``` 5. Get all students with their instructors. If a student has no instructor, then show `NULL` for the instructor's name. ```sql ``` ## Aggregation 1. Get the maximum IQ in all students (Try without aggregation first). ```sql ``` 2. Get the maximum IQ in all students (With aggregation). ```sql ``` 3. Get the oldest batch from the batches table. ```sql ``` 4. Fetch the number of batches that start with the word `Jedi`. ```sql ``` 5. Get the average IQ of all students (Without using `AVG`) ```sql ``` 6. Get the average IQ of students in all batches. ```sql ``` 7. Find the average IQ of students in each batch. ```sql ``` 8. Find the total number of students in each batch. ```sql ``` 9. Get the total number of batches taught by each instructor. ```sql ``` 10. Find the average IQ of students in batches with batch ID `1` and `2`. ```sql ``` 11. Find count of students that are part of batches that have average IQ greater than `120`. ```sql ```