一.mysql中的优化 where语句的优化 1.尽量避免在 where 子句中对字段进行表达式操作select id from uinfo_jifen where jifen/60 > 10000;优化后:Select id from uinfo_jifen where jifen>600000; 2.应尽量避免在where子句中对字段进行函数操作,这将导致mysql放弃使用索引 select uid from imid where datediff(create_time,'2011-11…
E - Qwerty78 Trip Time Limit:2000MS Memory Limit:65536KB 64bit IO Format:%I64d & %I64u Submit Status Practice Gym 100947E Description standard input/output Announcement Statements Qwerty78 is a well known programmer (He is a member of the I…