mysql多表联合查询并统计
推广地点表promotion_addr字段：name，id
电话报竣表unicom_record字段：date, sheet_id（关联sheet表id）
报单表sheet字段：id,promotion_addr_id（关联promotion_addr表id）
要求统计某个月已报竣各推广地点的推广个数；
SELECT
p.name, count(*)
from
unicom_record AS ur
Left Join sheet AS s ON ur.sheet_id = s.id
Left Join promotion_addr AS p ON s.promotion_addr_id = p.id
WHERE
ur.status = 'COMPLETE' AND
ur.`date` >= '2010-03-01' AND
ur.`date` < '2010-04-01'
GROUP BY
p.id
(或使用between and语句)
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