Question

ticket                      
+----------+--------+
| ticketID | assign |
+----------+--------+
|     1015 | NULL   |
|     1020 | James  |
|     1021 | Nick   |
+----------+--------+

staffinfo
+---------+-------+
| staffID | staff |
+---------+-------+
|       1 | Jane  |
|       2 | James |
|       3 | Nick  |
|       4 | Cole  |
+---------+-------+

SELECT staff,COUNT(*) as count FROM staffinfo,ticket
WHERE ticket.assign = staffinfo.staff
GROUP BY staff

result:
    +-------+-------+
    | staff | count |
    +-------+-------+
    | James |     1 |
    | Nick  |     1 |
    +-------+-------+

Works fine, but infact i need smthing like:

+-------+-------+
| staff | count |
+-------+-------+
| James |     1 |
| Nick  |     1 |
| Jane  |     0 |
| Cole  |     0 |
+-------+-------+

COUNT doesnt count records that arent in the table, and since i just started learning SQL, i wanna ask if theres a way to count as the above result?

Answer 1

you should be using LEFT JOIN

SELECT  a.staff,    COUNT(b.assign) as count 
FROM    staffinfo a
        LEFT JOIN ticket b
            ON b.assign = a.staff
GROUP   BY a.staff

• SQLFiddle Demo

To fully gain knowledge about joins, kindly visit the link below:

• Visual Representation of SQL Joins