Fetch data using mysql left join using where clause on both table - mysql

Question

I have 2 tables, custom_leads_fields and custom_leads_fields_option. The primary key of custom_leads_fields is saved in custom_leads_fields_option table as c_id.
I need to fetch all the records from custom_leads_fields table where status = 1 and then I also needs matching records from custom_leads_fields_option where status = 1
custom_leads_fields table
c_id | user_id | label | status |
1 | 591 | A | 1 |
2 | 591 | B | 1 |
3 | 591 | C | 0 |
custom_leads_fields_option table
id | c_id | option | status
1 | 2 | yes | 1
2 | 2 | no | 1
3 | 2 | may | 0
4 | 3 | yy | 1
5 | 3 | zz | 1
Output required:
c_id | label | option
1 | A |
2 | B | yes
2 | B | no
It should return records from first table if status = 1 even if records are not available in second table, but if records are available in second table then only those records should be fetched whose status = 1.
I have written a query but it does not return label 'A' because matching records are not available in other table.
SELECT
`custom_leads_fields`.`c_id` AS `field_id`,
`custom_leads_fields_option`.`id` AS `option_id`,
`custom_leads_fields`.`label`,
`custom_leads_fields_option`.`option`
FROM
`custom_leads_fields`
LEFT JOIN
`custom_leads_fields_option`
ON custom_leads_fields.id = custom_leads_fields_option.custom_leads_field_id
WHERE
(`custom_leads_fields`.`user_id`=591)
AND (`custom_leads_fields`.`status`=1)
AND (`custom_leads_fields_option`.`status`= 1)

Answer 1

I think is left join and the label A doesn't have any relationship with custom_leads_fields_option table. So you can't use custom_leads_fields_option.status = 1. You can try this
select clf.*, clfo.*
from custom_leads_fields clf
left join custom_leads_fields_option clfo
on clf.id = clfo.c_id
where clf.status = 1
and (clfo.status = 1 or clfo.status is null);
sqlfiddle

Answer 2

you need to move status condition to join condition , this will give your desired output. All the records from left table and matched record (with status =1 condition) from right table
SELECT
`custom_leads_fields`.`c_id` AS `field_id`,
`custom_leads_fields_option`.`id` AS `option_id`,
`custom_leads_fields`.`label`,
`custom_leads_fields_option`.`option`
FROM
`custom_leads_fields`
LEFT JOIN
`custom_leads_fields_option`
ON custom_leads_fields.id = custom_leads_fields_option.custom_leads_field_id
AND (`custom_leads_fields_option`.`status`= 1) // changed line
// ^^^^^^^^^^^^^^^^^^
WHERE
(`custom_leads_fields`.`user_id`=591)
AND (`custom_leads_fields`.`status`=1)