PostgreSQL simply transpose/convert rows to columns

I read some SO posts like sql server 2008 r2 – Transpose rows to columns – Stack Overflow or sql – Postgres – Transpose Rows to Columns – Stack Overflow, but they are too complicated task to what I …

psycopg2 sql.SQL: Composed elements must be Composable

import psycopg2 from psycopg2 import sql import datetime def connect(conn): “”” Connect to the PostgreSQL database server “”” # create a cursor cur = conn….

Convert CTE Query into normal Query

I want to convert my @PostgreSQL, CTE Query, into Normal Query because the cte function is mainly used in data warehouse SQL and not efficient for Postgres production DBS. So, need help in converting …

Selecting cities that have a combination of products in SQL

I have the following dataset, that have the prices for many products and cities: CREATE TABLE my_table ( the_id varchar(5) NOT NULL, the_date timestamp NOT NULL, the_city varchar(5) NOT …

Inserting large amounts of generated test data into postgresql database

I want to insert a billion rows of floaty data into a postgresql database so that I can test the performance of various postgis functions. My effort below takes ages and seems to be really inefficient …

How to return only those customer_id who visited Santa Clara after visiting Milpitas or #5 after visiting #2

Customer_ID Region Location Store_Entry ——————————————————– D1 2 Milpitas ‘2020-10-01’ 14:03 D2 5 Santa Clara ‘…

How to specify a limit on Postgres json_agg

I want a JSON output having the distinct values of a column and also a limited number of rows. This is the sample table that I have in a Postgres Database: Name Author Copies Sold —- …

How to provide list to epgsql sql where in clause (Erlang)

I can’t find the right syntax for providing a list of values to epgsql:equery function to use in the sql where in clause. I googled and tried several variants, all of them failed. Some of my tries are …

SQL some selections into one (or get two colums from one)

I use PostgreSql, I have two tables (for example) Let table1 will contain stores, there are 2 types ‘candy store’ and ‘dental store’. Each row contains information about a customer’s purchase in a …

Inserting a generate_series select date statement into an array column

I have a Postgres table with a schema that looks like this – Table “public.nav_due_dates” Column | Type | Collation | Nullable | …