Re: Error in Table Creation - Mailing list pgsql-general

From Magnus Hagander
Subject Re: Error in Table Creation
Date
Msg-id CABUevEwYWSsmXttjetn2qqD0x+hx81W4qYhi7a4uoX_jR1OHqg@mail.gmail.com
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In response to Error in Table Creation  (Rajnish Vishwakarma <rajnish.nationfirst@gmail.com>)
List pgsql-general


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..)

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