Question

I am writing a php mysql application and I was running the following select query:

SELECT 
    individual_marriage.pk_marriage_ID, 
    husband.individual_person_FirstName, 
    husband.individual_person_LastName, 
    wife.individual_person_FirstName, 
    wife.individual_person_LastName 
FROM 
    (
        (
            individual_marriage AS im 
            INNER JOIN person AS husband ON 
            individual_marriage.fk_IndividualID_male=husband.pk_person
        ) 
        INNER JOIN person AS wife ON individual_marriage.fk_IndividualID_female=wife.pk_person
    ) 
WHERE 
    im.Sec5A_applicable='yes'

The problem lies somewhere in the WHERE statement and the mysqli_query returns false. mysql_errno() and mysql_error() is also returning blank somehow.

Answer 1

SELECT  im.pk_marriage_ID, 
        husband.individual_person_FirstName, 
        husband.individual_person_LastName, 
        wife.individual_person_FirstName, 
        wife.individual_person_LastName 
FROM    individual_marriage AS im INNER JOIN person AS husband
                ON im.fk_IndividualID_male = husband.pk_person
        INNER JOIN person AS wife
                ON im.fk_IndividualID_female = wife.pk_person) 
WHERE   im.Sec5A_applicable = 'yes'

We can help more if you could post the SCHEMA of your table. If you run this query and return blank rows, it means that there are columns in the individual_marriage that are not in the table person and because you are also using INNER JOIN.

UPDATE

SELECT  im.pk_marriage_ID, 
        COALESCE(husband.individual_person_FirstName,'') as  husbandFirstName
        COALESCE(husband.individual_person_LastName, '') as  husbandFamilyName
        COALESCE(wife.individual_person_FirstName,'') as    WifeFirstName
        COALESCE(wife.individual_person_LastName ,'') as    WifeLastName
FROM    individual_marriage AS im LEFT JOIN person AS husband
                ON im.fk_IndividualID_male = husband.pk_person
        LEFT JOIN person AS wife
                ON im.fk_IndividualID_female = wife.pk_person) 
WHERE   im.Sec5A_applicable = 'yes'