mysql 请问如何优化？
本帖最后由 .SELECT COUNT(DISTINCT c.uc_id),b.industry_level_3FROM sys_account_industry a
LEFT JOIN sys_account f ON f.account_id = a.account_id
LEFT JOIN sys_user_product_region g ON g.user_id = f.user_id
LEFT JOIN dim_product b ON g.product_id = b.product_id
LEFT JOIN fact_information c ON c.product_id = b.product_id
LEFT JOIN fact_bridge_info_risk d ON d.uc_id = c.uc_id
LEFT JOIN dim_risk e ON e.risk_id = d.risk_id
/*WHERE a.account_id = ?AND a.type = ? "+condition+*/
GROUP BY b.industry_level_3
idselect_typetable type possible_keys key key_lenref rowsExtra
---------------------------------------------------------------------------------------------------------------------------------------------------
1SIMPLE a ref PRIMARY PRIMARY 4 const 2Using index; Using temporary; Using filesort
1SIMPLE f const PRIMARY,account_id PRIMARY 4 const 1
1SIMPLE g ref PRIMARY PRIMARY 4 244_shendu.f.user_id 7Using index
1SIMPLE b eq_refPRIMARY PRIMARY 4 244_shendu.g.product_id 1
1SIMPLE c ref idx_fact_product_ididx_fact_product_id4 244_shendu.b.product_id 297Using index
1SIMPLE d ref PRIMARY PRIMARY 4 244_shendu.c.uc_id 1Using index
1SIMPLE e eq_refPRIMARY PRIMARY 4 244_shendu.d.risk_id 1Using index 癫痫的急救措施是什么 http://jiankang.zkxww.com/dxbdyf/10970319082.html
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