Question

I have a MySQL database, there’s a table which have column Time’s Type is Nvachar(50) and its values is kind like this “05/09/2012 20:53:40:843” *(Month-date-year hour:mins:second:msecond)*

Now I want to query to get a record have Time after “10/05/2012 01:00:30 PM”.
I had code in C# to converted it to “05/10/2012 13:00:30” before making a query.
My Query :

SELECT * FROM ABCDFEGH WHERE capTime > '05/10/2012 13:00:30' LIMIT 0, 1

But i got no record. So please tell me how can I can make it return record have time after the time above ???

More Info My C# code :

string tableName = "ABCDFEGH";
string date = "05/10/2012 13:00:30";

var query = "SELECT * FROM " + tableName + " WHERE capTime > '" + date + "' LIMIT 0, 1";

var cmd = new MySqlCommand(query, connection);
MySqlDataReader dataReader = null;
try
{
dataReader = cmd.ExecuteReader();
}

I’m so so so so so so sorry. I made a mistake the query must be

SELECT * FROM ABCDFEGH WHERE capTime > '05/10/2012 13:00:30' LIMIT 0, 1

This query is successful return the record i need 🙂

But soemhow I have mistyped it into

SELECT * FROM ABCDFEGH WHERE capTime > '05-10-2012 13:00:30' LIMIT 0, 1

Sorry again, topic close. But tks for evveryone tried 🙂

Answer 1

I recommend using the DATETIME datatype instead of NVARCHAR. Store dates in YYYY-MM-DD HH:MM:SS format, which is the native DATETIME format recognized by MySQL.

Also use date literals in the same format.

Two reasons for this recommendation: First, DATETIME takes only 8 bytes, instead of up to 150 bytes which is the potential size of a multibyte 50 character varchar.

Second, the sort order of DATETIME will be the same as the chronological order. So if you create an index on the Time column, your > comparison can benefit from the index. Your query will be much faster as a result.