how to make a apriori table with dynamicaly mysql - mysql

Question

i have 3 tables like this
create table order_match
(
id int(10) PRIMARY KEY not null,
order_status_id int(10) not null
);
create table order_match_detail
(
id int(10) PRIMARY KEY not null,
order_match_id int(10) not null,
product_id int(10) NOT NULL
);
create table product
(
id int(10) PRIMARY KEY not null,
name varchar(255) not null
);
Insert into order_match (id, order_status_id)
select 1, 6 union all
select 2, 7 union all
select 3, 6 union all
select 4, 6;
Insert into order_match_detail (id, order_match_id, product_id)
select 1, 1, 147 union all
select 2, 2, 148 union all
select 3, 3, 147 union all
select 4, 4, 149 union all
select 5, 4, 147;
Insert into product (id, name)
select 147, 'orange' union all
select 148, 'carrot' union all
select 149, 'Apple';
with order_match.id = order_match_detail.order_match_id
and order_match_detail.product_id = product.id
i want to make the data where order_status_id not in 7 then it's success transaction and from that success transaction, if the transaction buy apple, then the column of apple contain 1 else if not buying, then 0 and this is my expected results, i want to make this data to analyze in
id (in order_match) | Orange | Carrot | Apple
1 1 0 0
3 1 0 0
4 1 0 1
with that problem i can solve it with this query
select om.id,
count(DISTINCT case when omd.product_id = 147 THEN 1 END) Orange,
count(DISTINCT case when omd.product_id = 148 THEN 1 END) Carrot,
count(DISTINCT case when omd.product_id = 149 THEN 1 END) Apple
from order_match om
left join order_match_detail omd
on om.id = omd.order_match_id
where om.order_status_id in (4, 5, 6, 8)
group by om.id
the real problem is, in my real database, it's contain 1550 product_id, how to make it automatically so no need to input manual the product_id untill 1550 product_id
this is the fiddle https://dbfiddle.uk/?rdbms=mysql_5.7&fiddle=c0eb7fe1b012ab1c909d37e325a8d434
i've tried the new queries like this and it still wrong
SET #sql = NULL;
SELECT
GROUP_CONCAT(DISTINCT
CONCAT(
'count(case when product.name = ''',
product.name,
''' then 1 end) AS ',
replace(product.name, ' ', '')
)
) INTO #sql
from product;
SET #sql = CONCAT('SELECT omd.order_match_id, ', #sql, ' from order_match_detail omd
left join order_match om
on omd.order_match_id = om.id
left join product p
on omd.product_id = p.id
where om.order_status_id in (4, 5, 6, 8)
group by omd.order_match_id');
PREPARE stmt FROM #sql;
EXECUTE stmt;

Answer 1

your query is almost correct you were missing on alias instead of p you should use 'product' in second query, it would work
SET group_concat_max_len = 1000000;
SET #sql = NULL;
SELECT
GROUP_CONCAT(DISTINCT
CONCAT(
'count(case when product.name = ''',
product.name,
''' then 1 end) AS ',
'"',replace(product.name, ' ', ''),'"'
)
) INTO #sql
from product;
SET #sql = CONCAT('SELECT omd.order_match_id as id, ', #sql, ' from order_match_detail omd
left join order_match om
on omd.order_match_id = om.id
left join product product
on omd.product_id = product.id
where om.order_status_id in (4, 5, 6, 8)
group by omd.order_match_id');
PREPARE stmt FROM #sql;
EXECUTE stmt;
You can remove DISTINCT from GROUP_CONCAT(DISTINCT if you are sure that product id's is having unique names for each id's
Then i would get the exact result as you mentioned in question else just you will see, Apple column first and Orange column last, overall result is as expected.