För fast pivot sql, prova detta:
select
t.client_name,
sum(if(t.distributor = 'Dis A', t.amount, 0)) as `Dis A`,
sum(if(t.distributor = 'Dis B', t.amount, 0)) as `Dis B`,
sum(if(t.distributor = 'Dis C', t.amount, 0)) as `Dis C`,
sum(if(t.distributor = 'Dis D', t.amount, 0)) as `Dis D`
from (
select c.id, c.client_name, d.distributor, r.amount
from clients c
left join reports r on c.id = r.clientId
left join distributor d on d.id = r.distributorId
)t
group by t.id
order by t.client_name
För dynamisk pivot sql, prova detta:
SET @sql = NULL;
SELECT
GROUP_CONCAT(DISTINCT
CONCAT(
'sum(if(t.distributor = ''',
distributor,
''', t.amount, 0)) AS `',
distributor ,'`'
)
) INTO @sql
FROM distributor;
SET @sql = CONCAT('SELECT t.client_name, ', @sql, ' FROM (
select c.id, c.client_name, d.distributor, r.amount
from clients c
left join reports r on c.id = r.clientId
left join distributor d on d.id = r.distributorId
)t
group by t.id
order by t.client_name');
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;