如何只删除表中的最高记录？

Question

I'm just looking for simple code which deletes the top record from a table.

I've tried:

SqlCommand Delete = new SqlCommand("Command String", cn);
cn.Open();
Delete.CommandText = "DELETE TOP (1) queue.* FROM queue  ";
Delete.ExecuteNonQuery();
cn.Close();

But I get an error:

Incorrect syntax near '*'.

TOP only seems to work with SELECT .

Answer 1

You can do this:

DELETE TOP(1) FROM queue

However, this will just delete a random row (most likely the first row, but not necessarily). You probably want to do something more meaningful, such as this:

DELETE FROM queue WHERE queueId IN (
     SELECT TOP 1 queueId FROM queue ORDER BY queueId
)

This is just an example. I don't know your table structure or fields, so you'll need to decide how to order it yourself. Keep in mind that issuing "DELETE TOP (1) from queue" will not necessarily delete the first row. What it does is it deletes the first row SQL server decided to serve you. It may or may not be the first row in your table though.

Answer 2

Your sql query for deleting the top record is wrong.

Replace This:

Delete.CommandText = "DELETE TOP (1) queue.* FROM queue  ";

With

Delete.CommandText = "DELETE TOP(1) FROM queue";