按声明分组

Question

使用以下代码时，我收到语法错误：

SELECT students.ID, students.LNAME, students.FNAME, students.PROGRAM,
enrollments.CAMPUS, enrollments.PROGRAM, enrollments.STATUS,
enrollments.STARTDATE, enrollments.DROPDATE, enrollments.GRADDATE, 
programcost.tuition, programcost.books, programcost.other,
accountledger.id, accountledger.transactionamount, 
sum(accountledger.TRANSACTIONAMOUNT) AS 'TotalCost' GROUP BY accountledger.id


FROM students LEFT JOIN enrollments ON students.ID = enrollments.ID
LEFT JOIN programcost ON students.PROGRAM = programcost.programcode
INNER JOIN accountledger 
ON enrollments.ID = accountledger.ID 
AND enrollments.ENROLLMENTNUMBER = accountledger.ENROLLMENTNUMBER   

目标：

每个学生在accountledger.amount字段中可能有多个条目。最终，我希望能够按students.id或accountledger.id进行分组

非常感谢您的帮助。