I am not sure whether I should ask this question on SO or not. But I have to as I don’t have clear idea about my doubt. I was told not to set default values in rails migrations and use null values instead in a code review by our CTO. And his explanation is like this once the database gets
Tag: postgresql
Postgres Function to insert multiple records in two tables
create table public.orders ( orderID serial PRIMARY KEY, orderdate timestamp NOT NULL ); create table public.orderdetails ( orderdetailID serial PRIMARY KEY, orderID integer …
Can I store a Word document in a PostgreSQL database? [closed]
We maintain our data in a PostgreSQL database, and keep the relevant documentation in the form of Word (TM) files. Now a peculiar sentence in the description of the project states that the …
postgres column “X” does not exist
I have this postgrse code: and I get this error: how can it be? it’s a value not a column.postgr Answer Use single quotes for string constants Also you can escape single quotes in data by doubling them SQL FIDDLE DEMO
How can I import a JSON file into PostgreSQL?
For example I have a file customers.json which is an array of objects (strictly formed) and it’s pretty plain (without nested objects) like this (what is important: it’s already include ids): And I want to import them all into my postgres db into a table customers. I found some pretty difficult wa…
Set empty strings (”) to NULL in the whole database
In my database are many text columns where values are empty strings (”). The empty strings need to be set to NULL. I do not know the exact schemas, tables and columns in this database or rather I want to write a general solution which can be reused. How would I write a query / function to find all text
error: there is no unique constraint matching given keys for referenced table “incident”
I know that this question has been already answered a million of times, but I couldn’t find any solution. Well I have these three tables on postgres sql. When I try to create the table incident_has_volunteer it throws the error there is no unique constraint matching given keys for referenced table ̶…
Postgres GROUP BY, then sort
I have a database query like: SELECT Foo, Foo2, some_calc as Bar, some_other_calc as Bar2, From FooBar — some inner joins for the calcs GROUP BY FOO ORDER BY Bar DESC, Bar2 DESC; I want …
PostgreSQL copy/transfer data from one database to another
I need to copy data from one table to another. the two tables have almost the same structure, but are in different databases. i tried wenn i try this, i get error cross database … not implemented Answer This is a really straightforward task. Just use dblink for this purpose: If you need to fetch data fr…
Postgres: select all row with count of a field greater than 1
i have table storing product price information, the table looks similar to, (no is the primary key) no name price date 1 paper 1.99 3-23 2 paper 2.99 5-25 3 paper 1.99 …