Can I create a user defined function in Postgres either through the C-Language Function API or by using pl/pgsql which accepts a callback function as parameter? As far as I see there is no way to do this through the C-Language API since it only accepts sql datatypes and there is no datatype for function. But maybe I’m missing something?
Superkey, candidate key & primary key
Can any kind soul clarify my doubts with a simple example below and identify the superkey, candidate key and primary key? I know there are a lot of posts and websites out there explaining the differences between them. But it looks like all are generic definitions. Example: So from the above example, I can know StudentNumber is a primary key.
How can I improve my Classic VBA coding using SQL? I’m making a mess with loops
Well… I am a n00b, I know that. And this is pretty straight foward. Basically this is the code I’ve been writing. rstSwift.MoveFirst Do While Not rstSwift.EOF If Left(rstSwift!Date, 2) & …
Best way to delete millions of rows by ID
I need to delete about 2 million rows from my PG database. I have a list of IDs that I need to delete. However, any way I try to do this is taking days. I tried putting them in a table and doing it in batches of 100. 4 days later, this is still running with only 297268 rows deleted.
Oracle Count even if nothing is there
So i have this query: It will return stuff from place and then d is another table describes. It will get the number of reviews the place has and the average rating. This works perfectly fine as long as there is something in the describes table. How can i go about getting the stuff that does not have anything in
Create unique constraint with null columns
I have a table with this layout: CREATE TABLE Favorites ( FavoriteId uuid NOT NULL PRIMARY KEY, UserId uuid NOT NULL, RecipeId uuid NOT NULL, MenuId uuid ) I want to create a unique …
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