With postgres I’m trying to get a single user and all their posts, but when I inner join the Users and Posts tables I receive this: QUERY: I’m also trying to do the same thing but as a json QUERY: I know why but I don’t know how to avoid it, can someone help me to get something like this:
Tag: postgresql
Why does Postgresql function not work as expected
I have table like this I create get function like this I tried to call function like this but return json all 3 row instead of 1 row with booking_id 1467 can you explain root cause ? Answer The root cause of you problem is naming your parameter (booking_id) the same as a column name (booking_id) in your table. When
How to fix cache lookup failure/corrupted database?
I’ve got a postgres database that I’m trying to clean up with drop schema public cascade. The data on it is not that important and I never made any backups. I’m just trying to rebuild it. However, it seems an error I made earlier is causing the drop command to fail. When I run drop schema public cascade, I get
select subset of rows
I have the following table I want to write a query that ignores the rows with the latest DATE for each NAME No idea how to write a query like that…. Answer You can use rank() to rank the rows by descending DATE, then filter out rows with rank = 1 : Fiddle
How to convert this string into timestamp in postgresql?
I want to convert a string into timestamp I am using the following command for it However it is returning me ‘2023-07-17 23:38:02’ this instead of ‘2021-31-12 23:38:02’ Answer Place of month & day in the input string doesn’t match format string. Use: As pointed out in the comments, it’s apparent that you’re using Postgres prior to version 10. Since
Finding the immediate upper and lower of X
For a project, I have a table nearest_values as id value 1 8450 2 8500 3 8550 4 8600 5 8650 6 8700 Given a value say 8555, I need to select rows 2 and 3 ie immediately below and above as below. id value 2 8500 3 8550 another example for say value 8601 the selected rows should be
SQL Function has no destination when called
I’m getting a success when creating the below function, but when I call it I receive an error stating there is no destination. Answer Language SQL: https://www.postgresql.org/docs/current/xfunc-sql.html language plpgsql: https://www.postgresql.org/docs/current/plpgsql.html Language sql is more easier to understand. your query is not dynamic, so it’s just a function and $$ query $$. setof inventory.filmid%type will make it more flexiable. If you
Postgresql sum not working as expected when it is clear
I am solving the following Hard Leetcode SQL Question. Link to Question: https://leetcode.com/problems/trips-and-users/ (You can directly look at the solution and understand the problem) Question: Trips table: Users table: Output: Here’s my code: And the output is: How is the cancellation_rate is 0.00 when it is clear by looking at previous columns(s/c) that it should be 0.33,0.50, 0.00. Answer The
How can I write a Postgres (SQL) query for FIFO ‘closing stock’ inventory valuation?
Background I need to implement inventory valuation / costing using the FIFO (first-in, first-out) method. I’m running Postgres 11 running on CentOS 7. I’ve looked at, and tried, a fair number of hypotheses from SO and the wider internet (as well as searching my own print library which includes SQL Queries for Mere Mortals, PostgreSQL Up & Running, The SQL
How to separate column values by condition (pivot) to fill one row
I have two tables that I’d like do a full outer join where the resulting view separates the values table into two separate columns with one row for each name_id. I have made one approach with a CASE expression to select by type and then use it with pandas to fill in the values and return distinct name_ids. Name Table