在Sybase的现有表中添加标识列的同时对列进行排序

Question

Thanks to this good forum, got a number of solutions to my past queries, thanks to Google too. This is my first post in the forum although.

I have a table order with columns pin, orderPath, quantity . There are 5000 data in the table already. Now, I want to add an identy column, say OrderID , but with order by column pin .

Using the following query helps but not in the order as required.

ALTER TABLE order
ADD OrderID numeric(6,0) identity

Here's what I would like to see:

Pin--OrderPath--Quantity--OrderID 

11   xyz/pop    200       1 
22   kl/pod     100       2 
33   djh/dd     200       3  
44   dj/po      300       4 

Answer 1

ALTER TABLE orderADD 
ADD Order_ID datatype

Answer 2

If any of your logic requires the data to be returned or displayed in a certain order, don't rely on the database. Explicitly put an order by clause in your queries to ensure consistency.

SELECT pin, OrderPath, Quantity, OrderID
ORDER BY pin

If you need data to be stored in a particular order, it's recommended to us a clustered index on the column you want orderd. Clustered indexes keep data in order, making for faster retrieval, but keep in mind it does add cost to inserts.

create unique clustered index pin_idx on ORDER (pin)