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MySQL delete uniqueness constraint unique
2022-07-05 23:25:00 【Risehuxyc】
First, check the creation table :
show create table humanidentity.citycode;
drop index citycode_2 on humanidentity.citycode;
drop index citycode_3 on humanidentity.citycode;
I have added here many times unique There are more constraints _2 and _3 了 , Be sure to delete according to the name on this table , Otherwise it won't work .
Reference documents :
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