Teradata create volatile doesn't work on JDBC - sql

Question

When running the following Python code and SQL query on a Teradata Vantage Express server:
#!/usr/bin/env python3
import teradatasql
query = """CREATE VOLATILE TABLE target_table AS (
select * FROM MY_DB.MY_TABLE
)
WITH DATA ON COMMIT PRESERVE ROWS;
SELECT * FROM target_table;"""
con = teradatasql.connect(host="localhost", user="dbc", password="dbc")
cur = con.cursor()
cur.execute(query)
I get the following error:
teradatasql.OperationalError: [Version 17.20.0.7] [Session 2988] [Teradata Database] [Error 3932] Only an ET or null statement is legal after a DDL Statement.
However, when using bteq (Teradata's CLIv2 db connector), and running the same query it works like a charm and doesn't throw any error:
BTEQ -- Enter your SQL request or BTEQ command:
CREATE VOLATILE TABLE target_table AS (
select * FROM MY_DB.MY_TABLE
)
WITH DATA ON COMMIT PRESERVE ROWS;
CREATE VOLATILE TABLE target_table AS (
select * FROM MY_DB.MY_TABLE
)
WITH DATA ON COMMIT PRESERVE ROWS;
*** Table has been created.
*** Total elapsed time was 1 second.
BTEQ -- Enter your SQL request or BTEQ command:
SELECT TOP 1 * FROM target_table;
SELECT TOP 1 * FROM target_table;
*** Query completed. One row found. 9 columns returned.
*** Total elapsed time was 1 second.
customer_id customer_token customer_branch customer_num
-------------- ------------------------------ --------------- ------------
8585 452004 83 808038
BTEQ -- Enter your SQL request or BTEQ command:
Any idea?
Note that no useful Google entries were found for either Python based JDBC drivers (e.g. teradatasql) or Node.js based drivers.

Answer 1

In the bteq examples you’ve given there are individual queries being executed; each query is separated by a “;”. However, in the Python code you have combined 2 queries into a single string and are trying to execute that string as a single query - which won’t work.
You need to write the Python code to run each query separately, in the same way that the bteq code does. For example:
query = """CREATE VOLATILE TABLE target_table AS (
select * FROM MY_DB.MY_TABLE
)
WITH DATA ON COMMIT PRESERVE ROWS;”””
con = teradatasql.connect(host="localhost", user="dbc", password="dbc")
cur = con.cursor()
cur.execute(query)
query = “””SELECT * FROM target_table;"""
cur.execute(query)