I'm practicing SQL in Jupyter Notebook. I use sqlaclhemy and psycopg2 libs for practicing PostgreSQL syntax (using ElephantSQL) and sqlite3 lib for local db.
I have a request:
sql = '''
with medium_credits as (
select t.credit_amount from german_credit t
where t.credit_amount > 1000 and t.credit_amount < 3000
group by t.credit_amount),
medium_credits_info as (
select * from german_credit t
where t.credit_amount in medium_credits)
select t.purpose, t.housing, count(1) as count
from medium_credits_info t
group by t.purpose, t.housing
'''
Running this request using pd.read_sql(sql,connection), where connection is object created with sqlite3 - it goes great.
When I try to try it in Postgres-like system using pd.read_sql(sql,engine), where engine is object created with sqlalchemy, it throws a ProgrammingError:
ProgrammingError: (psycopg2.errors.SyntaxError) syntax error at or near "medium_credits"
LINE 14: where t.credit_amount in medium_credits)
I guess, Postgres doesn't let you use values from CTE-created table directly this way.
Is there any option I could run this code without an error?
PS: local and elephantsql databases are identical
try this :
with medium_credits as (
select t.credit_amount from german_credit t
where t.credit_amount > 1000 and t.credit_amount < 3000
group by t.credit_amount),
medium_credits_info as (
SELECT *
FROM german_credit t
INNER JOIN medium_credits m
ON m.credit_amount = t.credit_amount)
Related
I can select(in Oracle) from postgers with dblink, and its work fine.
But if i create procedure with this select:
Procedure:
`CREATE OR REPLACE PROCEDURE test_merge as
begin
MERGE INTO CARDS C
USING (SELECT c."card_id", 1, n."channel"
FROM "table_1"#DBLINK_NAME n
JOIN
"table_2"#DBLINK_NAME c
ON n."card_id" = c."id"
WHERE n."type" = 'param1') B
ON (C.CARDID = B."card_id")
WHEN MATCHED
THEN
UPDATE SET C.SENDR = 1, C.PHONE = '+' || B."channel";
end;`
ORA-04052: error occurred when looking up remote object postgres.table_name#DBLINK_NAME ORA-00604: error occurred at recursive SQL level 1 ORA-28500: connection from ORACLE to a non-Oracle system return this message: ERROR: relation "postgres.card" does
Have any idea?
Oracle 11g
Thanks!
It was necessary to specify the owner of the database on postgre. In my case, it was enough to specify "public". in the procedure. before accessing tables.
"public"."table_1"#DBLINK_NAME
I try to add quotes. But it did not work:
I'm using Postgres.
Here is my query in navicat which results in syntax errors:
WITH t1 AS
(
SELECT
*
FROM
"olympics_history"
)
Yes it works like this:
WITH t1 AS
(
SELECT
*
FROM
"olympics_history"
)
SELECT games
FROM t1
WHERE t1.season = 'Summer'
Thanks #a_horse_with_no_name
I'm using this code to extract information from this database. However, it is showing me this error:
ERROR: Teradata prepare: Syntax error, expected something like ')' between a string or a Unicode character literal and the word
'd'. SQL statement was: WITH vmher102ult as ( select cod_cte, max(fec_consulta) as max_fec_consulta from
klarmxpw_her.vmher102 where cod_cte not in ('','0','00000000') and fec_consulta>='01MAR2021'd group by cod_cte) select t1.*
from klarmxpw_her.vmher101 as t1 inner join vmher102ult as t2 on t1.cod_cte=t2.cod_cte and
t1.fec_consulta=t2.max_fec_consulta.
The code I'm using for this pass through is the following:
proc sql;
connect to teradata as tera (user=&tuser. password=&tpass. server='TDMX03');
create table vmher101_m as
select * from connection to tera (
WITH vmher102ult as (
select cod_cte, max(fec_consulta) as max_fec_consulta
from klarmxpw_her.vmher102
where cod_cte not in ('','0','00000000')
and fec_consulta>='01MAR2021'd
group by cod_cte)
select t1.*
from klarmxpw_her.vmher101 as t1
inner join vmher102ult as t2
on t1.cod_cte=t2.cod_cte and t1.fec_consulta=t2.max_fec_consulta);
disconnect from ter;
Does anybody know what can I do?
You need to use TERADATA code inside the () after from connection to tera.
Try
and fec_consulta>= DATE '2021-03-01'
Teradata Documentation
Error Code: 1064. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AS a LIMIT 0, 1000' at line 3
Query:
SELECT * FROM (
subject s INNER JOIN prerequisite p ON s.subject_code = p.subject_id)
AS a
I think what you want to do are derived tables
https://dev.mysql.com/doc/refman/5.6/en/derived-tables.html
SELECT * FROM (
select * from subject s INNER JOIN prerequisite p ON s.subject_code = p.subject_id)
AS a
I have imported one shapefile named tc_bf25 using qgis, and the following is my python script typed in pyscripter,
import sys
import psycopg2
conn = psycopg2.connect("dbname = 'routing_template' user = 'postgres' host = 'localhost' password = '****'")
cur = conn.cursor()
query = """
ALTER TABLE tc_bf25 ADD COLUMN source integer;
ALTER TABLE tc_bf25 ADD COLUMN target integer;
SELECT assign_vertex_id('tc_bf25', 0.0001, 'the_geom', 'gid')
;"""
cur.execute(query)
query = """
CREATE OR REPLACE VIEW tc_bf25_ext AS
SELECT *, startpoint(the_geom), endpoint(the_geom)
FROM tc_bf25
;"""
cur.execute(query)
query = """
CREATE TABLE node1 AS
SELECT row_number() OVER (ORDER BY foo.p)::integer AS id,
foo.p AS the_geom
FROM (
SELECT DISTINCT tc_bf25_ext.startpoint AS p FROM tc_bf25_ext
UNION
SELECT DISTINCT tc_bf25_ext.endpoint AS p FROM tc_bf25_ext
) foo
GROUP BY foo.p
;"""
cur.execute(query)
query = """
CREATE TABLE network1 AS
SELECT a.*, b.id as start_id, c.id as end_id
FROM tc_bf25_ext AS a
JOIN node AS b ON a.startpoint = b.the_geom
JOIN node AS c ON a.endpoint = c.the_geom
;"""
cur.execute(query)
query = """
ALTER TABLE network1 ADD COLUMN shape_leng double precision;
UPDATE network1 SET shape_leng = length(the_geom)
;"""
cur.execute(query)
I got the error at the second cur.execute(query),
But I go to pgAdmin to check result, even though no error occurs, the first cur.execute(query) didn't add new columns in my table.
What mistake did I make？ And how to fix it？
I am working with postgresql 8.4, python 2.7.6 under Windows 8.1 x64.
When using psycopg2, autocommit is set to False by default. The first two statements both refer to table tc_bf25, but the first statement makes an uncommitted change to the table. So try running conn.commit() between statements to see if this resolves the issue
You should run each statement individually. Do not combine multiple statements into a semicolon separated series and run them all at one. It makes error handling and fetching of results much harder.
If you still have the problem once you've made that change, show the exact statement you're having the problem with.
Just to add to #Talvalin you can enable auto-commit by adding
psycopg2.connect("dbname='mydb',user='postgres',host ='localhost',password = '****'")
conn.autocommit = True
after you connect to your database using psycopg2