I have a messages table with fields channel_number, body, created_at, recipeint_id & sender_id I want to have messages distinct on channel_number and order by messages.created_at basically I want …
Tag: postgresql
SQL table with a column which may have “multiple types of NULL” values
The title may be confusing so I need to clarify. I have the following survey dataset that I need to transfer to a PostgreSQL database. Where -10000, -20000, and -30000 all represent a null value, but due to different reasons. (e.g., -10000 means that the participant was not shown the question about the column, -20000 means the participant skipped the
PostgreSQL: exclude complete jsonb array if one element fails the WHERE clause
Assume a table json_table with columns id (int), data (jsonb). A sample jsonb value would be When I use an SQL statement like the following: … the two array elements are unnested and the one that qualifies the WHERE clause is still returned. This makes sense since each array element is considered individually. In this example I will get back
How I can update one to many relation in Postgres?
Here is my first table question. Questions have many options, so I referring every option row with question_id Now, How can I update both tables in one query? I building an API. The below-given output is for request. The request will response with question details and options for the question. I am able to update question but questions have many
DB link in postgres looking at another localhost image : relation tablename does not exist
i’m using docker to host two different postgresql instances to try and produce a proof of concept for python as an etl to move data between the two i can connect to the one via python fine but then when calling a procedure inside the first instance it cant find the table in the second instance im connecting to the
Postgres query nested JSONB
I have a JSONB column containing list of objects.> Here’s the table schema: column Name | Datatype ——————— timestamp | timestamp data | JSONB Sample Data 1. timestamp : …
Conditional Postgres Query
The PG table looks like this: I would like to write a query that only lists rows in which Name has a ‘Type A’ record but not a Type B record. This is the result I am hoping for: Answer You can use a nested select:
Delete records referenced by other records in different tables
I have a following requirement: I need to delete records from one table based on the given ID, now this table is referenced by another table and that other table is referenced by yet another table and that last table is also referenced by another table, so I have a chain like this: table_1 <- table_2 <- table_3 <- table_4
How do I parameterize this jsonb array contains query?
I have the following sql: Which gives me (as expected): 789019 | 789019 Now, I need to parameterize the query but am unable to: I get an empty row and that’s because it is literally searching for “$1”. I try to remove the double quotes then it complains I’m not sure how to resolve this one. Answer If you just
Remove Duplicate Result on Query
could help me solve this duplication problem where it returns more than 1 result for the same record I want to bring only 1 result for each id, and only the last history of each record. My Query: Result of my query, but returns 3 or 5 identical ids with different histories I want to return only 1 id of