Question

Let’s say I got a table of Clients (tblClients) and a table of quotes (tblQuotes).

To get all quotes from our existing client, I did the following:

SELECT q.quoteId, c.contact, q.job, 
FROM tblQuotes AS q 
INNER JOIN tblClients AS c ON q.user = c.user

For each quote, we got a date the quotes was created. That date is in tblDate. The only way I found for displaying that date is when I display my records, I do an other request like this:

SELECT Date 
FROM tblDate 
WHERE id = %1  =>  %1 is q.quoteId

Everything works fine, but I decided to add inputs that alternate the SQL request. For example, c.Contact can be “John”

WHERE c.Contact = 'John'

How about the Date? I can easily get q.quoteId, c.Contact and q.Job but I don’t know how to make it work with Date too.

WHERE c.Contact = 'John' AND ...

Answer 1

Just add another join (use INNER JOIN assuming each quote has a date value):

SELECT 
    q.quoteId, c.contact, q.job, d.Date
FROM 
    tblQuotes AS q INNER JOIN 
        tblClients AS c ON q.user = c.user INNER JOIN
            tblDate AS d on d.id = q.quoteId

You can then modify accordingly to specify any additional criteria using the WHERE clause:

SELECT 
    q.quoteId, c.contact, q.job, d.Date
FROM 
    tblQuotes AS q INNER JOIN 
        tblClients AS c ON q.user = c.user INNER JOIN
            tblDate AS d on d.id = q.quoteId
WHERE
    d.Contact = 'John'