Music Brainz数据库中的SQL查询

Question

我可以在Music Brainz数据库（musicbrainz web site）

中进行此查询

  

找到最古老的意大利语版本（结果必须包括发布名称，发布日期和国家/地区名称（即意大利））

我想某些字段是null，所以我使用该函数来合并以使用假设值设置其字段（对于9999年，对于第13个月，对于第32天）

数据库的架构是这样的：

这是查询代码：

select release.name as nomeRelease, release_country.date_year as anno, release_country.date_month as mese, release_country.date_day as giorno, area.name as paese

from release left join release_country on release.id = release_country.release
         join country_area on release_country.country = country_area.area
         join area on area.id = country_area.area

where coalesce(release_country.date_day, 32) = 
(
    select min(coalesce(release_country.date_day, 32))

    from release left join release_country on release.id = release_country.release
                 join country_area on release_country.country = country_area.area
                 join area on area.id = country_area.area 

    where area.name = 'Italy' and release_country.date_month = 
        (
            select min(coalesce(release_country.date_month, 13)) 

            from release left join release_country on release.id = release_country.release
                         join country_area on release_country.country = country_area.area
                         join area on area.id = country_area.area

            where area.name = 'Italy' and release_country.date_year = 
            (
                select min(coalesce(release_country.date_year, 9999)) 

                from release left join release_country on release.id = release_country.release
                             join country_area on release_country.country = country_area.area
                             join area on area.id = country_area.area

                where area.name = 'Italy'
            )
        )
)

查看数据库的行应该是1983年发布的版本，但是当我运行查询时因此我没有行