I have the following table (stripped down for demonstration) products - id - part_number - group_id I want to be able to query against products and only return a single row per group_id (whichever is noticed first in the query…
How do I get a queryset of specific child classes? It doesn't look like going through related_name is the answer. Using Django 3.2.6 btw. Here is my setup: class Quiz(models.Model): name = # char field class Question(models.Model): # a quiz…
due to a bad foreign key, we had some non written inserts in to database, but i have the wal files generated when this actions, just a few, so im wondering if is possible to decrypt them and read the…
as shown below, i have a large db-table with several columns. i want to be able to select the last inserted row in that table..how can i achieve that in postgresql output "timeofinsertion","selectedsiteid","devenv","threshold","ec50ewco","dose","apprateofproduct","concentrationofactingr","unclass_intr_nzccs","unclass_inbu_nzccs","vl_intr_nzccs","percentage_vl_per_total_nzccs_intr","vl_inbu_nzccs","percentage_vl_per_total_nzccs_inbu","totalvlnzccsinsite","percentage_total_vlnzccs_per_site","l_intr_nzccs","percentage_l_per_total_nzccs_intr","l_inbu_nzccs","percentage_l_per_total_nzccs_inbu","totallnzccsinsite","percentage_total_lnzccs_per_site","m_intr_nzccs","percentage_m_per_total_nzccs_intr","m_inbu_nzccs","percentage_m_per_total_nzccs_inbu","totalmnzccsinsite","percentage_total_mnzccs_per_site","h_intr_nzccs","percentage_h_per_total_nzccs_intr","h_inbu_nzccs","percentage_h_per_total_nzccs_inbu","totalhnzccsinsite","percentage_total_hnzccs_per_site","unclass_intr_zccs","unclass_inbu_zccs","vl_intr_zccs","percentage_vl_per_total_zccs_intr","vl_inbu_zccs","percentage_vl_per_total_zccs_inbu","totalvlzccsinsite","percentage_total_vlzccs_per_site","l_intr_zccs","percentage_l_per_total_zccs_intr","l_inbu_zccs","percentage_l_per_total_zccs_inbu","totallzccsinsite","percentage_total_lzccs_per_site","m_intr_zccs","percentage_m_per_total_zccs_intr","m_inbu_zccs","percentage_m_per_total_zccs_inbu","totalmlzccsinsite","percentage_total_mzccs_per_site","h_intr_zccs","percentage_h_per_total_zccs_intr","h_inbu_zccs","percentage_h_per_total_zccs_inbu","totalhzccsinsite","percentage_total_hzccs_per_site","totalunclassnzccs","totalunclasszccs","totalnzccsintr","totalnzccsinbu","totalnzccsinsite","totalzccsintr","totalzccsinbu","totalzccsinsite","totalvlinsite","percentageof_total_vl_insite_per_site","totallinsite","percentageof_total_l_insite_per_site","totalminsite","percentageof_total_m_insite_per_site","totalhinsite","percentageof_total_h_insite_per_site","total_unclass_with_nodatacells_excluded","total_unclass_with_nodatacells_included","total_with_nodatacells_excluded","total_with_nodatacells_included" "3-2-2023 10:0:3:745762","202311011423",test,1,"3.125","0.75","75","100","0","0","0","0","0","0","0","0.0","0","0","0","0","0","0.0","0","0","0","0","0","0.0","0","0","0","0","0","0.0","0","0","0","0.0","32","91.4","32","82.1","0","0.0","3","8.6","3","7.7","4","100.0","0","0.0","4","10.3","0","0.0","0","0.0","0","0.0","0","0","0","0","0","4","35","39","32","82.1","3","7.7","4","10.3","0","0.0","0","0","39","39"
I am beginner docker user. I installed docker and postgresql in Mac OS. and why most of documents mention the directory /var/lib/postgresql/data as an volume setting??? Because in my local directory, there is not existed /var/lib/postgresql.. Is it default option?…
I'm new to SQL and I don't understand why you need a <> condition in a self join like below. I get that a join with an equal to condition won't return any results but I can't get my head…
I have three database tables: product product_manufacturer product_manufacturer_warranties. The product table has a one-to-one mapping with product_manufacturer and the product_id is stored in the product_manufacturer table. The product_manufactuer table has a one-to-many mapping with the product_manufacturer_warranties table. I need to…
I have a database (PostgreSQL) where there is a main table student, additional information amount and 3 dictionaries. I make a query with grouping by three fields of dictionary IDs, output the number of objects and the amount from an…
i have a query like this: select name from tbl1 where id in ( select id from tbl2 where code in (12,13,14,15,16)) and then I get the names: name1 name2 name3 etc... How can I modify the query to get…
I've faced a strange SQL query like ALTER TABLE some_db.some_table ADD COLUMN metadata_labels varchar(255) DEFAULT FALSE; I'd expect it to fail because I'm adding a Boolean default value for the varchar column. But at least at Postgres, it is executed…