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Don Burleson Blog 







Oracle Find First Row

Oracle Database Tips by Donald BurlesonJune 30, 2015

Question:   I want to find the first row inserted into an Oracle database.  How can I accomplish this?

Answer:  In order to locate the first row inserted into a table, one of the columns must contain either a date or timestamp which was populated by sysdate at the time of insertion.  As long as this requirement is met, it is a simple matter of querying the minimum value of the timestamp/date field and selecting the relevant information from it:

insert into mytab (vehicle_id, last_row) 123, sysdate
group by

Oracle does not insert rows in any particular order, and rows are inserted based on the next free block in the table's tablespace.  Hence, you need to procedurally mark the "first", "next" or "last" rows in a table.  

Also, see my notes on finding the top "n" rows in a table and the "top 10" rows.

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