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select id from t_invoice_detail where
id BETWEEN 66 and 68
查出来的结果包括66和68在内
等同于求id>=66 and id<=68
select id from t_invoice_detail where
id BETWEEN 68 and 66
调换顺序
且值大于等于左区间小于等于右区间
等同于求id>=68 and id<=66
会发现无结果