I have this postgres query that is validating if the columns are null or not based on one codition, this is a normal query that is not requiring function, could be overkill a functional approach because this is unique scenario…
I run the below query concurrently in pgAdmin to see how SELECT FOR UPDATE run. The logic is that there will be a limit for number of users for each team. And if the number reach the limit, the insert…
I am a sql newbie. I have data in a mysql db that looks like col1. col2. col3. col4. col5. a b true true c a d false false e a b false false c a f false false g…
There are two MySQL tables: table1 id | time | status ----------------------- 1 | 10:00 | conn | 1 | 10:01 | disconn | 2 | 10:02 | conn | 2 | 10:03 | disconn | 3 | 10:04 |…
I currently have this so I can show product results that say "Product data not found" in the meta_key "product_info" My current query is this SQL: SELECT * FROM `wp_postmeta` WHERE `meta_key` LIKE 'product_info' AND `meta_value` LIKE '%Product data not…
I can't figure out how to get a list of scalar functions in a postgres database. I've tried to write different queries, but I can't find an exact solution to determine the scalar type returned by a function. So far…
I have a SQL database for maintaining D&D games which has tables for things like Characters, Items, and Locations. I want to start modelling the relationships between all these different entity types, such as the relationship a Character has with…
How does ON predicate of Postgres LATERAL JOIN work? Let me clarify question a bit. I've read the official documentation and a bunch of articles about this kind of JOIN. As far as I understood it is a foreach loop…
So, I am trying to create a query that counts the numbers of Redirects per week per Site. I made the below query which gives me almost the correct results, but if there are no Redirects, there are no count…
If I have a table Application_user with 100 columns, what is the performance difference between two queries: Query 1: select * from Application_user; Query 2: select a.col1.a.col2,a.col3........ from Application_user a; Performance difference between two queries. And reason behind it