sql,sql-server-2008 , Sql inner join with three tables


Sql inner join with three tables

Question:

Tag: sql,sql-server-2008

I have this problem, I am a newbie in SQL. I have 3 tables:

TBL_PRODUCT:

    prod_id, 
    prod_type, 
    prod_code, 
    prod_desc

TBL_DOCUMENT:

    doc_id, 
    doc_name, 
    doc_expiry, 
    doc_term, 
    enable_amt

TBL_DOCUMENT_GROUP:

    grp_id, 
    prod_type, 
    doc_type, doc_id 

For every document, there are corresponding products, one to many. What I can't figure out is how can I display the products of each document. Thank you in advance!

I'm so sorry but I really don't know how to do it, all I know are the basics of SQL.


Answer:

Based on the schema you are providing, I will assume that you find all the products of each document based on 1. which document_group the document is in 2. which product_type the document_group is associated with If that is the case, this is what your query would look like:

SELECT doc_id, prod_id
FROM tbl_document AS td
JOIN tbl_document_group AS tdg ON td.doc_id = tdg.doc_id
JOIN tbl_product AS tp ON tdg.prod_type = tp.prod_type
WHERE doc_id = 1;

However, the scheme you outlined above is a little unconventional.


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