I am trying to learn some postgres skills to help me building my flask application and I really care about performance but I faced some issues. I have the following table (Sessions) in postgres: SessionID Other columns Statics BDzQDeGr *…
It seems that most databases that support GIS encode the object as a string within a function, such as: SELECT ST_GeomFromText('LINESTRING(110 40, 2 3, -10 80, -7 9)') The one exception I've seen to this is from Postgres directly (and…
I have an issue where only the first row from my database is being returned multiple times within a list even though the SQL query shows different rows being returning. my jpa query is: @Query(value = "SELECT BK.ISBN," + "BK.AUTHOR,…
I created the generated column "available_quantity" - alter table products_regions add column available_quantity int8 GENERATED ALWAYS AS (quantity_total - quantity_ordered) STORED; When performing some logic, only the "quantity_ordered" column changes. But I get an ERROR: the column "available_quantity" can only…
Quite frequently, I'd like to retrieve only the first N rows from a query, but I don't know in advance what N will be. For example: try(var stream = sql.selectFrom(JOB) .where(JOB.EXECUTE_AFTER.le(clock.instant())) .orderBy(JOB.PRIORITY.asc()) .forUpdate() .skipLocked() .fetchSize(100) .fetchLazy()) { // Now run…
Recently I've migrated primary keys from integer to bigint and found an article where the author manually updates the table statistics after updating PK data type: -- reanalyze the table in 3 steps SET default_statistics_target TO 1; ANALYZE [table]; SET…
I currently have two tables called calendars and events in my PostgreSQL database which are joined on calendars.uuid = events.calendar_id. At present, a person can have more than one calendar in the calendars table, however I need to change this…
I have a database table which have field counter that counts number of requests to API (by updating it +1), but I want to get these counts for specific date, (for this month). Is it possible to get it? I…
I have a post table that stores the most liked comment (top_comment). I need an SQL statement that updates the top_comment when a comment is liked/unliked: UPDATE post SET top_comment = T1.body FROM ( SELECT body FROM comment WHERE count_like…
I am new to SQL and trying to manipulate some basic data. My schema is: CREATE SCHEMA dannys_diner; SET search_path = dannys_diner; CREATE TABLE sales ( "customer_id" VARCHAR(1), "order_date" DATE, "product_id" INTEGER ); INSERT INTO sales ("customer_id", "order_date", "product_id") VALUES…