Database

declare @num as int<br />
select @num = count(*) from Users where groupID = 10<br />
<br />
select top 100 username, address , @num from Users where groupID = 10

update location<br />
set tempareture=34<br />
where city='Athens';

cmd.CommandText = searchSqlstr;

try
{
	return Convert.ToInt64(cmd.ExecuteScalar());
}
finally
{
	connection.Close();
}

using (SqlConnection connection = new SqlConnection(connString))
{
	connection.Open();

	try
	{
		SqlCommand cmd = connection.CreateCommand();
		cmd.CommandType = CommandType.Text;
		cmd.CommandText = searchSqlstr;
		return Convert.ToInt64(cmd.ExecuteScalar());
	}
	// Put a catch{} block here, if you need one
	finally
	{
		connection.Close();
	}
}

using (SqlConnection connection = new SqlConnection(connString))
{
	connection.Open();

	SqlCommand cmd = connection.CreateCommand();
	cmd.CommandType = CommandType.Text;
	cmd.CommandText = searchSqlstr;
	return Convert.ToInt64(cmd.ExecuteScalar());
}

SELECT * FROM user WHERE clue IS NOT NULL<br />
GO

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insert table3(email)
select distinct email from table1
union
select distinct email from table2