Question

There are three fields in a table, all of them refer the same field in another table, like this:

table1
-------
! a_term_id* ! b_term_id* ! c_term_id* !
!            !            !            !

table2
-------

! term_id ! term_title ! term_description !
! ------- !            !                  !

columns a_term_id, b_term_id, c_term_id all refer to term_id

How should I write the SQL statement to retrieve the three fields’ info?

Answer 1

I think you need to know how Sql_Join works. Here on W3Schools you can find useful examples.

A simple example:

SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo
FROM Persons
INNER JOIN Orders
ON Persons.P_Id=Orders.P_Id
ORDER BY Persons.LastName

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EDIT

You can try something like this:

SELECT * FROM tableA 
inner join tableB on tableA.term_id = tableB.term_id 
inner join tableC on tableA.term_id = tableC.term_id;

It an example you can modify as per your need.

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Edit 2

SELECT * FROM  tableB 
JOIN tableA AS tableA1 ON tableB.term_id = tableA1.a_term_id
JOIN tableA AS tableA2 ON tableB.term_id = tableA2.b_term_id
JOIN tableA AS tableA3 ON tableB.term_id = tableA3.c_term_id