AW: No result when selecting attstattarget from pg_attribute

Thank you Tom for clarification. However, in regards of pg_upgrade, which does not transfer statistics, how do I know
how to create the "CREATE STATISTICS" on the new PostgreSQL version?

e.g. Developers created a whole bunch of "CREATE STATISTICS" on all kind of tables, which ends up in pg_statistic_ext
view.

select * from pg_statistic_ext;
 stxrelid | stxname | stxnamespace | stxowner | stxkeys | stxkind | stxndistinct |   stxdependencies
----------+---------+--------------+----------+---------+---------+--------------+----------------------
    35600 | s1      |        16579 |    16569 | 1 2     | {f}     |              | {"1 => 2": 1.000000}

Is there any way how I can translate the view entries into into a SQL again?

CREATE STATISTICS s1 (dependencies) ON a, b FROM t1;



-----Ursprüngliche Nachricht-----
Von: Tom Lane <tgl@sss.pgh.pa.us>
Gesendet: Donnerstag, 28. November 2019 15:54
An: Sescu William (SW0) <william.sescu@suva.ch>
Cc: pgsql-admin@postgresql.org
Betreff: Re: No result when selecting attstattarget from pg_attribute

"William Sescu (Suva)" <william.sescu@suva.ch> writes:
> I was following the create statistics example from the doc
> https://www.postgresql.org/docs/11/sql-createstatistics.html
> and wondered why I don't see any results when selecting attstattarget from pg_attribute.

attstattarget has nothing to do with extended statistics.
It's for recording "ALTER TABLE ... SET STATISTICS n"
commands, which just control the granularity of the regular (pg_statistic) statistics.

Look into pg_statistic_ext to see the effects of CREATE STATISTICS.

regards, tom lane

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