Re: Wiki editor request: Fixing Sequences

Joe Krill wrote:
> Hello,
> 
> My wiki account name is JoeK
> 
> I was hoping to share an updated Fixing Sequences query (
> https://wiki.postgresql.org/wiki/Fixing_Sequences). We tried to use the
> query as it currently stands and ran into a handful of problems.

You're an editor now.  I think your proposed query will fail if you have
a default sequence in a different schema than the table it's default
for; watch out for that case.  Also, I propose that instead of || and
quote_foo(), the function "format" and cast of the pg_class.oid column to
regclass result in easier-to-read code.

Thanks

> SELECT 'SELECT SETVAL(' ||
> quote_literal(quote_ident(SCHEMAS.nspname) || '.' ||
> quote_ident(SEQUENCES.relname)) ||
> ', COALESCE(MAX(' ||quote_ident(COLUMNS.attname)|| '), 1) ) FROM ' ||
> quote_ident(SCHEMAS.nspname)|| '.'||quote_ident(TABLES.relname)|| ';'
> FROM pg_class SEQUENCES
> INNER JOIN pg_namespace SCHEMAS ON SCHEMAS.oid = SEQUENCES.relnamespace
> INNER JOIN pg_depend ON pg_depend.objid = SEQUENCES.oid
> INNER JOIN pg_attribute COLUMNS ON COLUMNS.attrelid = pg_depend.refobjid
> AND COLUMNS.attnum = pg_depend.refobjsubid
> INNER JOIN pg_class TABLES ON TABLES.oid = COLUMNS.attrelid
> WHERE SEQUENCES.relkind = 'S'

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
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