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This question already has an answer here:

Is there a way to calculate the row size (in bytes) of a particular table in postgresql / pgadmin3?

marked as duplicate by Jon Seigel, Aaron Bertrand Jun 19 '13 at 17:51

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    What would that measure? Especially in case of variable-width columns? – user1593 Jun 19 '13 at 17:44
  • The question this one was linked to primarily deals with the size of a whole table. To get the (varying) size of individual rows: SELECT pg_column_size(t) FROM tbl AS t LIMIT 10 More info in this question on SO. – Erwin Brandstetter Jun 20 '13 at 22:07

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