MySQL SQL使用force index where子句离开了join

Question

SELECT
partner_id, click_date, sum(clicks) as clicks
FROM
daily_metric
LEFT JOIN transaction ON daily_metric.partner_id = transaction.partner_id
FORCE INDEX (click_date_index) WHERE click_date BETWEEN :ycp0 AND :ycp1
GROUP BY partner_id , click_date) 

我有wrond syntacs：

您的SQL语法出错;查看与您的MySQL服务器版本对应的手册，以便在'FORCE INDEX（click_date_index）附近使用正确的语法WHERE click_date BETWEEN'2014-09-01'和'2014-0'在第26行。

索引用于where子句，我的syntacs有什么问题？

Answer 1

试试这个，因为他FORCE / USE / IGNORE追踪你加入的桌名：

SELECT
partner_id, click_date, sum(clicks) as clicks
FROM
daily_metric
LEFT JOIN transaction
FORCE INDEX FOR JOIN (click_date_index) ON daily_metric.partner_id = transaction.partner_id 
WHERE click_date BETWEEN :ycp0 AND :ycp1
GROUP BY partner_id , click_date)