关于MySQL的limit优化
2017-06-08 10:21
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对于MySQL的limit优化
正常的写法是什么什么一大堆然后limit 11111,10来进行分类,在优化的时候改写了这么一段代码经过改写的sql语句
这里把limit换了,写成AND ic.id>=11111 LIMIT 10,这样的格式,那个id是表的主键。
SELECT temp.*, COUNT(hhdv.id) AS reviewHdCount FROM (SELECT ic.id, ic.name, sd.name AS securityIndustry, n.name AS netRegion, bcdd.hd_count AS hdCount , bcdd.hd_count1 AS majorCount, bcdd.hd_count2 AS commonCount, bcdd.expired_hd_count AS overTimeCount, bcdd.close_hd_count AS fixedCount, bcdd.open_hd_count AS noFixedCount FROM info_company ic LEFT JOIN sys_dict sd ON ic.security_industry_id = sd.id LEFT JOIN info_net_region n ON n.id = ic.net_region_id LEFT JOIN info_net_region n2 ON n2.id = ic.street_id LEFT JOIN bs_company_data_daily bcdd ON bcdd.company_id = ic.id AND bcdd.id IN (SELECT MAX(id) FROM bs_company_data_daily GROUP BY company_id) WHERE 1 = 1 AND FIND_IN_SET(ic.security_industry_id, '3201,3206,3219,3221,3227,3236,3223,3199,3203,3204,3207,3211,3217,3218,3220,3222,3224,3233,3238,3239,3225,3200,3212,3213,3226,3228,3230,3231,3237,3229,3208,3209,3216,3234,3202,3205,3210,3214,3215,3232,3235,3201,3206,3219,3221,3227,3236,3223,3199,3203,3204,3207,3211,3217,3218,3220,3222,3224,3233,3238,3239,3225,3200,3212,3213,3226,3228,3230,3231,3237,3229,3208,3209,3216,3234,3202,3205,3210,3214,3215,3232,3235') AND (FIND_IN_SET(1, n.path) OR FIND_IN_SET(1, n2.path)) AND ic.`id` >=11111 LIMIT 10 ) temp LEFT JOIN hd_hidden_danger_verify hhdv ON hhdv.company_id = temp.id GROUP BY temp.id
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