SQL count(*) performance

Question

I have a SQL table BookChapters with over 20 millions rows. It has a clustered primary key (bookChapterID) and doesn\'t have any other keys or indexes. It takes miliseconds

Answer 1

try this, if you need to detect, if the table has more rows than one:

if (SELECT COUNT(*) FROM (SELECT TOP 2 * FROM BookChapters) AS b) > 1