I have a table keep track of hotel reservations with exclusion constraint like below. Currently, I allow guests to update their reservations. So if g ...
I have a table keep track of hotel reservations with exclusion constraint like below. Currently, I allow guests to update their reservations. So if g ...
I have a table defined like so How would I define an exclusion constraint, such that only one row of foo with a specific bar_id would be able to se ...
I have a key-value table. I want to impose a constraint that if a key has an entry with NULL value, it cannot have any other entries. How do I do t ...
My dataset looks like this: Could you help me coding this in R please? Thanks! I need to create a new column that will be called METABOLIC_SYNDRO ...
I have a table which have 2 column, start date and end date. start date is required end date is optional (so it's a period that basically never ...
i have a column "id_a" and a column "id_b". "id_a" is an integer[] type. "id_b" is an int type. I have to find a way to verify that there are no mo ...
I read a book Exclusion constraint CREATE TABLE movies ( Title TEXT, Copies INTEGER ); ALTER TABLE movies ADD EXCLUDE (title WITH=, copie ...
I am currently working with a bitemporal application, which stores data entries using 4 timestamps: Valid_from, Valid_to Registration_from, Registrat ...
Simplified M-N join table I want the obvious exclusion rule that if the fkey fields are the same, there is no overlap in the dates. (If the keys ar ...
I need to ensure my database only contains entries where two or more of its columns are unique. This can easily be achieved with a UNIQUE constraint o ...
If I have a Postgresql db schema for a tires table like this (a user has many tires): and I want to enforce a constraint that says "a user can only ...
I followed this blogpost: https://info.crunchydata.com/blog/range-types-recursion-how-to-search-availability-with-postgresql CREATE TABLE travels ( ...
for example: index by userid, sdate, edate if I insert new data like: I tried below using GIST, but how to combine it using ON CONFLICT? I go ...
I have defined this table: But when I'm doing this SQL: I'm expecting the ON CONFLICT clause to be executed, given that there is some row to be ...
I tried to have a PostgreSQL constraint so that there will be no overlap between two date intervals. My requirement is that the date c_from for one en ...
Is there a constraint or some other PostgreSQL feature that prevents CIDR columns from having values that overlap? For example: 192.168.1.0/24 and 1 ...
Consider the following table: to prevent 2 elevators on the same floor I can go with: In this case 3 will conflict with 4. However I do have a ...
I am trying to accomplish a PostgreSQL constraint on te following table: It contains contracts for suppliers with different prices. For a given tim ...
I'm unable to create an excludes index with this schema. The final alter table line here fails with I've double checked the docs, but I really c ...
From PostgreSQL document Exclusion constraints ensure that if any two rows are compared on the specified columns or expressions using the specifie ...