I have a bunch of tables in the database and in a separate schema. The tables' names are in this format:
???_???_???_YYYYMMDDwhere the last 8 characters is a date.
When I query either the information_schema.tables or pg_tables extracting the last 8 characters out and converting it to a date, it works:
select table_name, to_date(right(table_name, 8), 'YYYYMMDD') blah
from information_schema.tables
where table_schema = '????'
and table_catalog = '????';
select table_name, to_date(right(table_name, 8), 'YYYYMMDD') blah
from information_schema.tables
where table_schema = '????'
and table_catalog = '????';
But as soon as I reference it in the where clause, it gives a weird error:
select table_name, to_date(right(table_name, 8), 'YYYYMMDD') blah
from information_schema.tables
where table_schema = '????'
and table_catalog = '????'
and to_date(right(table_name, 8), 'YYYYMMDD') is not null;
ERROR: invalid value "tati" for "YYYY"
DETAIL: Value must be an integer.
select table_name, to_date(right(table_name, 8), 'YYYYMMDD') blah
from information_schema.tables
where table_schema = '????'
and table_catalog = '????'
and to_date(right(table_name, 8), 'YYYYMMDD') is not null;
ERROR: invalid value "tati" for "YYYY"
DETAIL: Value must be an integer.
It seems like some strange values were passed into the to_date function, but I'm seeing that the rightmost 8 characters of all the table names are dates. So only date strings are passed to the to_date function. Absolutely nothing containing the string "tati" is passed to the to_date function. What is going on? Is that a bug?
Brian
Brian
