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SELECT * FROM HJXX WHERE USER_ID IN (SELECT USER_ID FROM ID_XX)
using(StreamWriter sw = new StreamWriter(你的txt文件路径))
{
foreach(DataRow row in table.Rows)
{
string temp = row["USER_ID"].ToString() + " " + row["USER_NAME"].ToString() + " " + row["USER_XX"].ToString() + row["USER_JI"].ToString();
sw.WriteLine(temp);
}
}