I want to fill NULL values in device column for each session_id with an associated non-NULL value. How can I achieve that? Here is the sample data: +————+——-+———+ | session_id | step …
I want to fill NULL values in device column for each session_id with an associated non-NULL value. How can I achieve that? Here is the sample data: +————+——-+———+ | session_id | step …
I have a database with tables for equipment we service (table e, field e_id) contracts on the equipment (table c, fields c_id, e_id, c_start, c_end) maintenance we have performed in the past (table m,…
I have a repository of SQL queries and I want to understand which queries use certain tables or fields. Let’s say I want to understand what queries use the email field, how can I write it? Example SQL …
I want to achieve the same behavior as in next example: select array[1, 3] && array[1] and array[1, 3] && array[2] using the ALL construct like so: select array[1, 3] && all(…
I’m using Django with PostgreSQL as my Backend-Stack for an application of which the main feature is a complex, multilevel table displaying annotated time-series-data for different products. So …
I am creating indexes for a PostgreSQL database. I would like to know whether the column(s) used to order results in a PostgreSQL statement should be included in the index. Assume I have created a …
I have two tables. Likes table which contains it’s like_id (PK), vole_id, user_id, and created_at timestamp. And another table called voles that contain vole_id (PK), and user_id, as well as a bunch …
I’ve created a data set with Mockaroo and then added the file with cmd. But I am getting this error. ERROR: invalid input syntax for type numeric: The table definiton is this : create table car( id …
I have rainfall measurements stored in a postgresql table and wish to select the min and and max value since the last occurence of 9am, whether that is 9am of the current day, if after 9am, or 9am of …
I have the following postgres stored function: CREATE OR REPLACE FUNCTION wg.get_user( req jsonb) RETURNS jsonb LANGUAGE ‘plpgsql’ COST 100 VOLATILE AS $BODY$ DECLARE …