mysql query with join

问题

this is my database:

I would retrieve all records in richiestepreventivo where idImpresa==xx and all the data in privati where privati.id==richiestepreventivo.idPrivato. Can you explain me how I have to set the query with join?

Thanks.

回答1:

SELECT *
FROM privati AS p
INNER JOIN richiestepreventivo AS r
      ON p.id = r.idPrivato
WHERE r.idImpresa = xx

Are you asking for a simple inner join

回答2:

SELECT r.id, p.data 
FROM richiestepreventivo r 
JOIN privati p ON p.id = r.idPrivato 
WHERE r.id = XX;

来源：https://stackoverflow.com/questions/7026828/mysql-query-with-join