sql - Join two tables, not joined with any foreign keys and different unrelated ids -


i have 2 tables.

companynames: company_name text (unique) companyname_id bigint   homenicknames: home_nickname text (unique) nickname_id bigint

so, rows like:

    companynames     ==============     company_name   ||   companyname_id |:--------------------------------------:|      robert         |      123      mr.robert      |      123      mr.robertgrant |      123        homenicenames     ==============     home_nickname  ||   nickname_id |:-------------------------------------:|      robert         |      431      robb           |      431      dearrobb       |      431

assume every company name , nickname can joined because of 1 same company name , nickname.

i need query can generate following result:

       name_id || home_nickname |:-----------------------------------:|        123     |   robb        123     |   robert        123     |   dearrobb

find robertfirst , nicks id:

select     c.companyname_id   ,n2.home_nickname companynames c join homenicenames n   on c.company_name = n.home_nickname -- match robert join homenicenames n2   on n.nickname_id = n2.nickname_id   -- match nickname same id robert

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