MySQL multiple left join issues - mysql

Question

I have two tables that I am trying to query, and I can only get about half the information I need. The two tables are:
client_skills_new:
+----+-----------+------------+----------+-------------+
| id | client_id | job_sector | job_type | job_name |
+----+-----------+------------+----------+-------------+
| 79 | 24 | 3 | 39 | Accountant |
+----+-----------+------------+----------+-------------+
| 80 | 25 | 3 | 115 | Broker |
+----+-----------+------------+----------+-------------+
| 81 | 24 | 5 | 241 | Shop Worker |
+----+-----------+------------+----------+-------------+
and
job_sectors:
+-----+--------------------------+---------------+
| id | name | job_sector_id |
+-----+--------------------------+---------------+
| 3 | Accounting & Finance | 0 |
+-----+--------------------------+---------------+
| 115 | Brokerage | 3 |
+-----+--------------------------+---------------+
| 22 | Sales & Retail | 0 |
+-----+--------------------------+---------------+
The job sectors table actually contains job sectors and job types in one column (name). job_sector id links the two (ie brokerage is a subheading of accounting and finance - job_sector_id = id).
In the client_skills_new table the numbers stored under job_sector and job_type relate to the id column of job_sectors. What I am trying to do is write a query which will join the two to give me the textual value in the job_sectors table related to the job_sector and job_type integers in client_skills_new.
So far I have a query as follows:
SELECT client_skills_new.job_sector, job_sectors.id, job_sectors.name
FROM job_sectors
LEFT JOIN client_skills_new
ON client_skills_new.job_sector = job_sectors.id
WHERE client_id='$client_id';
From this, I get results as follows:
+------------+----+--------------------------+
| job_sector | id | name |
+------------+----+--------------------------+
| 3 | 3 | Accounting & Finance |
+------------+----+--------------------------+
| 22 | 22 | Sales & Retail |
+------------+----+--------------------------+
Which given id of 24 from my top table gives me about half of what I need. I'd like the query to also include the text name corresponding to job_type. I'm not quite sure what I need to add to finish the query. I tried a second left join but this kept erroring.
The output I'm looking for, given each id in client_skills_new, is as follows:
+----+--------------------------+-----------+----------+
| id | job_sector | job_type | job_name |
+----+--------------------------+-----------+----------+
| 80 | Accounting & Finance | Brokerage | Broker |
+----+--------------------------+-----------+----------+

Answer 1

Yes, you need 2 LEFT joins but the other way around:
SELECT c.id,
js.name AS job_sector,
jt.name AS job_type,
c.job_name
FROM client_skills_new AS c
LEFT JOIN job_sectors AS js
ON c.job_sector = js.id
LEFT JOIN job_sectors AS jt
ON c.job_type = jt.id
WHERE c.client_id='$client_id' ;

Answer 2

The problem is the where clause. It is "undoing" the left outer join, because the values in one table are NULL when there is no match.
The fix is to move the logic to the on clause:
SELECT client_skills_new.job_sector, job_sectors.id, job_sectors.name
FROM job_sectors LEFT JOIN
client_skills_new
ON client_skills_new.job_sector = job_sectors.id and
client_id='$client_id';