SQL SELECT with multiple tables and SUM

Question

I have used this forum for a while now to find answers to some SQL related questions. Now it's time to ask a question I have tried to figure out for some time now.

I have two tables (product and source).

I would like to create a SQL SELECT to retrieve a list of records from source and one additional record from product (a SUM of price). The table I would like to see should look something like this:

source.location and product.location are linked.

This code works and give the result I want:

SELECT s.source_id
    , s.location
    , s.source_name
    , s.source_description
    , s.source_date
    , s.source_price
    , p2.Total
    , sum(p1.price) as SumProductSold
FROM source s
JOIN product p1
    on s.location = p1.location
JOIN
(
    SELECT location, sum(price) as Total
    FROM product
    GROUP BY location
) p2
    on s.location = p2.location
WHERE p1.quantity < 1
GROUP BY s.source_id, s.location, s.source_name
    , s.source_description, s.source_date, s.source_price, p2.Total

Thank you bluefeet!!

You have two identical columns? SUM(product.location) | SUM(product.location) — Nick Rolando
– Nick Rolando, Commented Apr 4, 2012 at 18:26
Also, if source.location = product.location, why do you want a SUM on product_location? — Michael Berkowski
– Michael Berkowski, Commented Apr 4, 2012 at 18:26
possible duplicate of Simple SQL Select from 2 Tables (What is a Join?) — John Conde
– John Conde, Commented Jun 17, 2012 at 23:35

Taryn · Accepted Answer · 2012-04-04 20:23:11Z

4

without a whole lot of details your can do something like this:

SELECT s.source_id
    , s.location
    , s.source_name
    , s.source_description
    , s.source_date
    , s.price
    , sum(p.price) as SumProductPrice
    , sum(p.location) as SumProductLocation
FROM source S
JOIN product p
    on S.location = p.location
WHERE p.quantity < 1
GROUP BY s.source_id, s.location, s.source_name
    , s.source_description, s.source_date, s.price

if you post more details, then the query can be fine-tuned.

EDIT:

you can join on the products table a second time to get the total for the location:

SELECT s.source_id
    , s.location
    , s.source_name
    , s.source_description
    , s.source_date
    , s.price
    , sum(p1.price) as SumProductPrice
    , p2.Total
FROM source S
JOIN product p1
    on S.location = p1.location
JOIN
(
    SELECT location, sum(price) as Total
    FROM product
    WHERE quantity < 1
    GROUP BY location
) p2
    on S.location = p2.location
WHERE p1.quantity < 1
GROUP BY s.source_id, s.location, s.source_name
    , s.source_description, s.source_date, s.price, p2.Total

edited Apr 4, 2012 at 20:23

answered Apr 4, 2012 at 18:28

Taryn

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11 Comments

Hans Lernestål Over a year ago

I am storing information on purchased products in my source table. I am able to list all the information from this table but I would like to have an additional column (the SUM of sold product).The link is the location id (source.location and product.location).

Taryn Over a year ago

is the query I suggested not giving you the result you want? if not, then what appears to be wrong?

Hans Lernestål Over a year ago

I get an error: #1054 - Unknown column 'source.location' in 'field list'

Taryn Over a year ago

can you post your query that you are running?

Hans Lernestål Over a year ago

SELECT s.source_id , s.location , s.source_name , s.source_description , s.source_date , s.source_price , sum(p.price) as SumProductPrice , sum(p.location) as SumProductLocation FROM source s JOIN product p on s.location = p.location WHERE p.quantity < 1 GROUP BY s.source_id , s.location , s.source_name , s.source_description , s.source_date , s.source_price

|

Brian Hoover · Accepted Answer · 2012-04-04 18:28:12Z

0

I'm not sure I completely understand your table structure, but something like this should work:

Select source.source_id, 
  source.location, 
  source.source_name, 
  source.source_description,
  source.source_date,
  source.price,
  sum(production.location)
from source, product
  where source.location = production.location
  and location < 0
group by source.source_id, 
  source.location, 
  source.source_name, 
  source.source_description,
  source.source_date,
  source.price

answered Apr 4, 2012 at 18:28

Brian Hoover

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Comments

GarethD · Accepted Answer · 2012-04-05 06:11:03Z

0

From what I gather you want something like this:

SELECT  source.source_id,
        source.location,
        source.source_name,
        source.source_description,
        source.source_date,
        source.price,
        SUM(product.price) AS Price1,
        SUM(CASE WHEN product.quantity < 1 THEN product.price ELSE 0 END)  AS Price2
FROM    Source
        INNER JOIN Product
            ON Product.Location = Source.Location
GROUP BY 
        source.source_id,
        source.location,
        source.source_name,
        source.source_description,
        source.source_date,
        source.price

edited Apr 5, 2012 at 6:11

answered Apr 4, 2012 at 19:59

GarethD

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1 Comment

Hans Lernestål Over a year ago

I get the flowing error on this: #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '[Price1], SUM(CASE WHEN product.quantity < 1 THEN product.price ELSE 0 E' at line 7

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