mysql - How to search where some data is in table 1 and other data is in table 3 with both having a UUID the same -


i have 3 tables

for instance

salestable -id -variableb -customeruuid -variablec  customertable -customeruuid -contractuuid  contracttable -contractuuid -variabled

so doing sql query on salestable

like:

select distinct variableb salestable variabled = "blah";

how can this? can find contract associated current salestable?

a bit more info

they 1:1 relationship - contracttable tied 1 customertable tied 1 salestable

there lot of data in database thousands of entries - query not run need run efficent.

select  a.*    salestable         inner join customertable b             on a.customeruuid = b.customeruuid         inner join contracttable c             on b.contractuuid = c.contractuuid   c.variabled = 'valuehere'

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