我不明白为什么rails datetime不匹配。下面的测试失败了,因为我的created_at日期不相同,但我不知道为什么it "renders the course as json" do get :index, format: :jsonendCoursesController renders the #index view (FAILED - 1)
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这是我用来重现这个问题的表定义:( n tinyint not null测试数据:+------+---+ In [32]: cur.execute("select kind, sum(n) from test_sum_type group by kind")In [34]: cur.execute("select kind, n from test_sum
mysql数字列表的简单精度问题不能与单个计算的sum计算相同。(如何处理这个问题?)有一(1)美分的差异吗?| 42.52.5 | 53.1253 | 63.753.5 | 74.375Select sum(qty), sum(amount)示例3:642.8125
Since the answer was so vague