Обсуждение: Error in Table Creation

Поиск
Список
Период
Сортировка

Error in Table Creation

От
Rajnish Vishwakarma
Дата:
I am creating dynamically table in PostgreSQL using psycopg2 by passing the below 2 strings as column names:

'BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_with_metal_temp_TC_load_in_PA_load'

and

'BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_with_metal_temp_TC_load__in_TA_load'

And the above column names are not same ( both are different columns ) and both the columns has string same till   'BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_with_metal_temp_TC_load__  .

but i am getting errors as
Error:
Traceback (most recent call last): File "C:/Users/Administrator/PycharmProjects/untitled/table_creation_with_HDA_Data.py", line 131, in <module>   cursor.execute(sqlCreateTable)
psycopg2.errors.DuplicateColumn: column "BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_" specified more than once
The above columns are of type TEXT ...also it may be Numeric Type in future.

Require assistance from Postgres team on the above error.

Thanks
Rajnish Vishwakarma

Re: Error in Table Creation

От
Guillaume Lelarge
Дата:
Le jeu. 25 juin 2020 à 10:59, Rajnish Vishwakarma <rajnish.nationfirst@gmail.com> a écrit :
I am creating dynamically table in PostgreSQL using psycopg2 by passing the below 2 strings as column names:

'BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_with_metal_temp_TC_load_in_PA_load'

and

'BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_with_metal_temp_TC_load__in_TA_load'

And the above column names are not same ( both are different columns ) and both the columns has string same till   'BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_with_metal_temp_TC_load__  .

but i am getting errors as
Error:
Traceback (most recent call last): File "C:/Users/Administrator/PycharmProjects/untitled/table_creation_with_HDA_Data.py", line 131, in <module>   cursor.execute(sqlCreateTable)
psycopg2.errors.DuplicateColumn: column "BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_" specified more than once
The above columns are of type TEXT ...also it may be Numeric Type in future.

Require assistance from Postgres team on the above error.

Object names in PostgreSQL are limited to 63 characters. If you put more characters, it will silently truncate them to 63 characters. In your case, they are truncated, and the truncated strings end up being the same. So, use less characters for your objects' names.

Re: Error in Table Creation

От
Magnus Hagander
Дата:


On Thu, Jun 25, 2020 at 10:59 AM Rajnish Vishwakarma <rajnish.nationfirst@gmail.com> wrote:
I am creating dynamically table in PostgreSQL using psycopg2 by passing the below 2 strings as column names:

'BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_with_metal_temp_TC_load_in_PA_load'

and

'BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_with_metal_temp_TC_load__in_TA_load'

And the above column names are not same ( both are different columns ) and both the columns has string same till   'BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_with_metal_temp_TC_load__  .

but i am getting errors as
Error:
Traceback (most recent call last): File "C:/Users/Administrator/PycharmProjects/untitled/table_creation_with_HDA_Data.py", line 131, in <module>   cursor.execute(sqlCreateTable)
psycopg2.errors.DuplicateColumn: column "BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_" specified more than once
The above columns are of type TEXT ...also it may be Numeric Type in future.

Require assistance from Postgres team on the above error.


By default the maximum length of a column name (or other names) in postgres is 63 characters, see https://www.postgresql.org/docs/current/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS). You are trying to create columns with names that are way longer than that, so they will be truncated. If you create this table in psql it will show you a NOTICE information about this -- I believe in psycopg2 this shows up in conn.noticies (where conn is the connection object from psycopg2).

And truncated to 63 characters they *are* the same name. (Those are some crazy long column names btw..)

--