Mysql 2.23.45 win98. I create a table "user". Field Type Null Key Default Extra id char(10) userName char(20) I type " alter table user add primary key (id);". It work fine. "alter table user drop primary key;". Work fine. But "alter table user add primary key (userName)" didn't work. It print "ERROR 1062: Duplicate entry 'a' for key 1". What's wrong? Help me.
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