MS SQL Tables with no index
Posted on 2012-03-16
I need to convert a cloud based database to an internal MS SQL 2008 database and one issue I have run into is that none of these tables have any indexes declared. Now this causes me concern for several reasons but the one that stands out immediately is that in new code I have written around one of tables requires a set of rows to appear in a certain order. So a simple query was select itemnmbr,itemdesc from my table where categoryid='XX' order by seq. Where what I thought what this would give me is all items that are in category XX sorted by the seq number. However, I quickly discovered that they do not use the seq number field. They are all zeroes. So much to my amazement the correct order is always achieved by simply select itemnmbr,itemdesc from my table where categoryid='XX' with no order by clause. How is this possible? How can they be adding records to this table through their code and somehow always maintain the proper sort order without the use of an index? Is there some internal SQL database table structure element they are controlling?