create index index_workday_sysname on batch_monitor_log (workday, sysname);
drop index index_workday_sysname on batch_monitor_log ;
show index from batch_monitor_log ;
alter table t1 add index (`teacher`);
alter table t1 drop index (teacher)
create index index_workday_sysname on batch_monitor_log (workday, sysname);
drop index index_workday_sysname on batch_monitor_log ;
show index from batch_monitor_log ;
alter table t1 add index (`teacher`);
alter table t1 drop index (teacher)
本文标题:复合索引的创建删除
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