1.对布尔值取反,使用 ~. 如 update set status=~status where id=2; status的值为true || false. 2.对0.1 数值取反,使用abs() 取绝对值. 如 update set status=abs(status-1) where id=1; status的值为0 || 1. 这里如果数据表里的值一开始为0,那么会报一个错: [Err] 1690 - BIGINT UNSIGNED value is out of range in '(r
Bared Wrapped using Newtonsoft.Json; using Newtonsoft.Json.Linq; string str = JsonConvert.SerializeObject(student); StringContent content = new StringContent(str, Encoding.UTF8, "application/json"); HttpClient client = new HttpClient(); var
字段值 函数实现: )) ) as begin set @strs=','+@strs+',' ) ) set @str2='' declare SyncOrderCursor cursor for select b.Name from dbo.ShopStore as a inner join dbo.Shop as b on a.StoreGid=b.Gid ))+',%' open SyncOrderCursor fetch next from SyncOrderCursor into @
# 2.1处理缺失值,连续值用均值填充 continuous_fillna_number = [] for i in train_null_ix: if(i in continuous_ix): mean_v = df_train[i].mean() continuous_fillna_number.append(mean_v) df_train[i] = df_train[i].fillna(mean_v) np.save("continuous_fillna_number.npy"
class Demo{ public static void main(String[] args){ int i =2584; //do{ int g = i%10; int s = (i%100)/10; int b = (i%1000)/100; int q = i/1000; System.out.println(g); System.out.println(s); System.out.println(b); System.out.println(q); //}while(i <= 1