SQL Count each time row equal to column - mysql

Question

So I have the carriesOut table:
+------------+------------+
| theatreNo | doctor |
+------------+------------+
| 1 | DD0094CYY |
| 1 | DD234CD1X |
| 2 | DD1199XYZ |
| 2 | DD1199XYZ |
| 4 | AB2323CYA |
| 4 | AB2323CYA |
+------------+------------+
And the doctor table:
+-------------+---------+
| NINumber | lname |
+-------------+---------+
| AB2323CYA | Falk |
| DD0094CYY | Gibbson |
| DD1199XYZ | Smith |
| DD234CD1X | Hammer |
+-------------+---------+
I'm trying to find how many times every doctor has been in an operation, for example, I should get the output:
+------------+---------+------------+
| doctor | lname | operations |
+------------+---------+------------+
| DD0094CYY | Gibbson | 1 |
| AB2323CYA | Falk | 2 |
| DD1199XYZ | Smith | 2 |
| DD234CD1X | Hammer | 1 |
+------------+---------+------------+
And here is what I've tried so far:
SELECT o.doctor
, d.lname
, COUNT(theatreNo) operations
FROM Hospital_CarriesOut o
JOIN Hospital_Doctor d
ON d.NINumber = o.doctor
WHERE theatreNo IN (1,2,4)
GROUP
BY statement DESC
I only get the the following output:
+------------+---------+------------+
| doctor | lname | operations |
+------------+---------+------------+
| DD0094CYY | Gibbson | 1 |
| AB2323CYA | Falk | 1 |
| AB2323CYA | Falk | 3 |
| DD234CD1X | Hammer | 1 |
+------------+---------+------------+

Answer 1

it should be group by Hospital_CarriesOut.doctor, Hospital_Doctor.lname
SELECT Hospital_CarriesOut.doctor, Hospital_Doctor.lname,
COUNT(theatreNo) AS operations
FROM Hospital_CarriesOut JOIN Hospital_Doctor ON Hospital_CarriesOut.doctor=Hospital_Doctor.NINumber WHERE theatreNo IN (1,2,4)
GROUP BY Hospital_CarriesOut.doctor, Hospital_Doctor.lname