mysql查询时条件不区分大小写

  表中有条数据，SUBCLASSNAME的值为Dnsmysql mysql中：sql select t.* from test_subclass t where SUBCLASSNAME='DNS'oracle 或select t.* from test_subclass t where SUBCLASSNAME='dns'.net 均可以查到数据，blog 在oracle中只有用select

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