SQL Query Is Giving Wrong Output

Question

i have three tables EMPLOYEE,EMPLOYEE_UNIT,UNIT i want employee details including name and employee unit names for single user based on employee_id(For example employee 1 is working for 2 different units.. i want employee name with working units:

TABLE STRUCTURE AS FOLLOWS:
EMPLOYEE TABLE
EMPLOYEE_ID,FIRST_NAME,LAST_NAME,PHONE_NUMBER
1            emp1       emp1      ***********
2            emp2       emp2      ***********
3            emp3       emp3      ***********
4            emp4       emp4      *********** 
UNIT TABLE
UNIT_ID,UNIT_TITLE,CITY
1       unit1      city1
2       unit2      city2
3       unit3      city3

EMPLOYEE_UNIT TABLE
EMP_UNIT_ID,EMPLOYEE_ID,UNIT_ID
1            1           2
2            1           3
3            2           1

MyQUERY:

SELECT DISTINCT CONCAT(FIRST_NAME,LAST_NAME) AS TITLE,PHONE_NUMBER 
FROM EMPLOYEE AS E 
LEFT JOIN EMPLOYEE_UNIT AS EU ON EU.EMPLOYEE_ID = E.EMPLOYEE_ID
WHERE E.EMPLOYEE_ID = 137

Answer 1

For a list of employee names and corresponding unit titles, use this:

SELECT e.FIRST_NAME, e.LAST_NAME, GROUP_CONCAT(DISTINCT u.UNIT_TITLE SEPARATOR ', ')
FROM EMPLOYEE e
JOIN EMPLOYEE_UNIT m ON e.EMPLOYEE_ID = m.EMP_ID
JOIN UNIT u ON m.UNIT_ID = u.UNIT_ID
GROUP BY e.EMPLOYEE_ID

MySQL has GROUP_CONCAT for this type of thing.