Question re: serial

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I have a table with a primary key defined as serial unique. When I insert a
row into the table, I need to get the value of that row back so that I can
use it to link rows in another table to it. How do I do that in Postgresql? I
know that I can define a sequence and insert the value manually, but is there
a way to query the value of the most recently inserted serial column of a
row?

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