>As long as the system datetime is not reset the number generated is unique. You can prefix a machine number to it to make it unique on a network.
>Rajesh

Hello,

Doesn't Sys(2015) check if the value already exists.
When i have a table with 10.000 records and issue replace all .. with sys(2015) i have no duplicated values although the replace is faster then 10.000 miliseconds. (Sys(2015) is derived from the miliseconds)

Greetings,

KW