sql - Left joining two reference tables to get the proper value -


i have table client data, , must join 2 reference tables in order desired text value. somehow did not include data in 1 reference table, of data need value table.

first table data

id         clientid            companyid 1          199                 80 2          187                 91 3          85                  1001 4          83                  1145

company id can seen varies 80 - 1200

the problem is, values > 1000 stored in reference table companies, so

tblcompanies  companyid         companyname 1001              microsoft 1002              apple 1145              hp

the rest of company names stored in table

tblreference  id        fldname       label 80        company       adobe 81        company       amazon 91        company       pixel

tblreference has other data part reference id's 80 - 90, , other companyid's tblcompanies....

how able join 2 tables? without getting duplicate records. tried union , unioan didn't work out

first union tblcompanies , tblreferences tables together, join:

select t1.id, t1.clientid, t1.companyid, t2.companyname firsttable t1     inner join          (              select companyid, companyname tblcompanies              union              select id, label tblreference fldname = 'company'         ) t2 on t1.companyid = t2.companyid

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