> I am developing a database with PostgreSQL in Linux, and using ecpg to
> write the C program to communicate with the database.
> One of my application need to get the data from the last row in a
> table. Is there any function or command that can tract which is the
> last row of data in a table?
SQL is a set-oriented language. One should probably not assign any
significance to a storage order of rows.
It *is* possible to order the results of a query, and then your
first/last qualities do have meaning. I would suggest ordering your
query (perhaps on a "row update time" if by "the last row" you mean "the
more recently entered row") using the "DESC" qualifier in the ORDER BY
clause, then use a cursor to pick up the first row returned.
Good luck.
- Tom