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select * from USER where USER_NAME = '湘 123' 很慢;
select * from USER where USER_NAME = '123' 很快;
USER_NAME 建了索引的,中文开头查询,有一些快(像 USER_NAME = '你 123');‘粤 123 ’就几秒,‘湘 123 ’就更慢了,为什么呢?