regarding dual table

[ajse ruku]

Hi all,
I want to know what is the importance of dual table?
Why we get next sequence number from this table?

regards,
ajse

[Paul Sturrock]

Dual is a place holder, nothing more. It exists as a table containing one column called dummy with the value x. You use it to return constant values, such as the value of a sequence. The reason you use dual is it is guarenteed to only ever have one row and it is visible to all users.