Mysql: sum case with multiple table - mysql

Question

i have following table:
table1:
CREATE TABLE table1
(
id int auto_increment primary key,
person varchar(30),
color_code varchar(30),
item_id varchar(30),
date_start DATE,
date_complete DATE
);
INSERT INTO table1
(person, color_code, item_id, date_start, date_complete)
VALUES
('Jackson', 'RED', '1', '2013-07-11 11:23:39', '2013-08-1 11:23:39'),
('Danny', 'BLUE', '2', '2013-07-20 11:23:39', '2013-08-1 11:23:39'),
('Jimmy', 'GREEN', '5', '2013-05-15 11:23:39', '2013-08-1 11:23:39'),
('Jackson', 'RED', '3', '2013-02-16 11:23:39', '2013-08-1 11:23:39'),
('Jimmy', 'BLUE', '4', '2013-03-13 11:23:39', '2013-08-1 11:23:39'),
('William', 'RED', '5', '2013-04-29 11:23:39', '2013-08-1 11:23:39'),
('William', 'BLUE', '1', '2013-05-9 11:23:39', '2013-08-1 11:23:39'),
('Danny', 'GREEN', '5', '2013-01-6 11:23:39', '2013-08-1 11:23:39'),
('Jackson', 'RED', '4', '2013-07-11 11:23:39', '2013-08-1 11:23:39'),
('Jackson', 'RED', '5', '2013-08-7 11:23:39', '2013-09-1 11:23:39');
table2:
CREATE TABLE table2
(
id int auto_increment primary key,
item_code varchar(30),
item_name varchar(30)
);
INSERT INTO table2
(item_code, item_name)
VALUES
('1', 'APPLE'),
('2', 'BANANA'),
('3', 'PINEAPPLE'),
('4', 'WATERMELON'),
('5', 'GUAVA');
my sql query look like this:
SELECT
person AS 'Name',
COUNT(*) AS 'Total Item Purchased',
SUM(CASE WHEN (color_code='RED') THEN 1 ELSE 0 END) AS 'Total Red Color',
SUM(CASE WHEN (color_code='BLUE') THEN 1 ELSE 0 END) AS 'Total Blue Color',
SUM(CASE WHEN (color_code='GREEN') THEN 1 ELSE 0 END) AS 'Total Green Color',
SUM(CASE WHEN DATEDIFF(date_complete, date_start) BETWEEN 1 AND 30 THEN 1 ELSE 0 END) AS 'Bought Between 1-30 Days'
FROM table1
WHERE
person LIKE '%Jackson%' OR
person LIKE '%Danny%' OR
person LIKE '%Jimmy%' OR
person LIKE '%William%'
GROUP BY person;
Problem: How do i display the item_name from table2 to the select query with all the row group by the person? im thinking about subselect, after the 'Bought Between 1-30 Days' is it possible?
SQLFiddle: http://sqlfiddle.com/#!2/d59e0/4

Answer 1

You can join the tables and use GROUP_CONCAT():
SELECT
person AS 'Name',
COUNT(*) AS 'Total Item Purchased',
SUM(CASE WHEN (color_code='RED') THEN 1 ELSE 0 END) AS 'Total Red Color',
SUM(CASE WHEN (color_code='BLUE') THEN 1 ELSE 0 END) AS 'Total Blue Color',
SUM(CASE WHEN (color_code='GREEN') THEN 1 ELSE 0 END) AS 'Total Green Color',
SUM(CASE WHEN DATEDIFF(date_complete, date_start) BETWEEN 1 AND 30 THEN 1 ELSE 0 END) AS 'Bought Between 1-30 Days',
GROUP_CONCAT(item_name)
FROM table1 JOIN table2 ON table2.item_code = table1.item_id
WHERE
person LIKE '%Jackson%' OR
person LIKE '%Danny%' OR
person LIKE '%Jimmy%' OR
person LIKE '%William%'
GROUP BY person;
See it on sqlfiddle.
Note that it is sometimes better to simply join the tables and sort the resultset by person, performing such aggregation within the presentation layer of your application.

Answer 2

You can join the tables
SELECT
person AS 'Name',
COUNT(*) AS 'Total Item Purchased',
SUM(CASE WHEN (color_code='RED') THEN 1 ELSE 0 END) AS 'Total Red Color',
SUM(CASE WHEN (color_code='BLUE') THEN 1 ELSE 0 END) AS 'Total Blue Color',
SUM(CASE WHEN (color_code='GREEN') THEN 1 ELSE 0 END) AS 'Total Green Color',
SUM(CASE WHEN DATEDIFF(date_complete, date_start) BETWEEN 1 AND 30 THEN 1 ELSE 0 END) 'Bought Between 1-30 Days',
item_name as 'item'
FROM table1,table2
WHERE
table1.item_id = table2.item_code and (
person LIKE '%Jackson%' OR
person LIKE '%Danny%' OR
person LIKE '%Jimmy%' OR
person LIKE '%William%')
GROUP BY person;
Check the js http://sqlfiddle.com/#!2/d59e0/13