select counts versus insert/select counts

All,

I came across a rather strange situation a few days ago. One of our developers wrote a simple sql script that inserted some rows into a table. However, he was getting things that were not expected. He ran just the select portion of the code and got a different number of rows. Any thoughts on what it might be or what to search for?

We are running on AIX Version 5.2 with Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production With the Partitioning, OLAP and Data Mining options.

Thanks,
Michael

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