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C# code:
DateTime dt = DateTime.fromOADate(40277.4927000525);
MessageBox.Show(dt.ToString());
MessageBoxÏÔʾµÄʱ¼äÊÇ—>2010-4-9 11:49:29
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C# code:
SqlDataAdapter da = new SqlDataAdapter("select [ID],cast([Time] as datetime) from DatapointValue2", con);
//×¢:40277.4927000525¾ÍÊÇTimeÁÐijһÐÐÖеÄÖµ
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isnull(a,b)
¼´Èç¹ý×Ö¶ÎaΪnullÔò·µ»Øb
eg:
select isNUll(a,b) from table_1;
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SQL code:
mysql> select ifnull(null,2);
+----------------+
| ifnull(null,2) |
+------------ ......