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Results tagged with postgresql
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user 75908
All versions of PostgreSQL. Add an additional version-specific tag like [postgresql-13] if that context is relevant.
1
vote
1
answer
117
views
How to retrieve a view column derivation in PostgreSQL or Greenplum
I want to retrieve the derivation expression of a column in a view, and I want to do it dynamically from within a stored procedure, so psql \d+ or pgAdmin is no use to me.
Where can I retrieve this i …
- 539
0
votes
When postgresql sequences get out of sync?
This happened to me, when I first started using a PostgreSQL variant (Greenplum). I renamed a table, created a new table under the original name, and ran an INSERT to copy the data across. … I did not know that PostgreSQL implemented SERIAL columns with an associated sequence, and when the new table got a new sequence that started at 1, I got duplicates in the table when I started inserting …
- 539
1
vote
0
answers
47
views
When was a table created? [duplicate]
Is there any way to find out when a table was created in PostgreSQL or Greenplum, other than finding the underlying table and looking at the OS creation timestamp? …
- 539
1
vote
Amount of time FULL VACUUM/VACUUM
You should never stop a vacuum process, ever.
A vacuum full will completely recreate the table, so it should take roughly as long to run as it would to create and populate a brand new table and index …
- 539
2
votes
1
answer
62
views
Why do PostgreSQL examples say `+ integer '7'`? [closed]
The PostgreSQL date functions documentation contains the following example:
date '2001-09-28' + integer '7'
Why does it consist of converting a string to an integer? …
- 539
9
votes
1
answer
18k
views
How to get the sequence name for a serial column
As far as I can tell, this query should show the expression for the new value of a serial column:
select d.adsrc
from (
SELECT a.attrelid, a.attnum, n.nspname, c.relname, a.attname
FROM pg_catalog. …
- 539