I’m using MySQL Workbench and I made a table called ‘organizations’ and want to block any try of adding a value to a column with less than 5 letters. The column name is ‘namee’. I made this, but I get an error: Error: Answer Based on the error message you shared, you apparently t…
Tag: check-constraints
Is there a way to enforce the MySQL CHECK constraint for calculated value
Apologies if my wording is very awkward/non-fitting for a programmer – I’m just a SQL noob who’s taking a beginners’ class. I’m using PHPMyAdmin to design an e-commerce database in which the minimum age of a customer is 18 yo. Because age is a calculated column, I want to record …
Adding checks in postgres table where data is already incorrect
This seemed to be a useful question to me and didn’t find any written information about it anywhere so thought that this might be too obvious. Just want to confirm this: If I alter a postgres table to add a check but the data that is already present is inconsistent with this check, nothing will happen t…
Check Constraint with Filtering Logic
I have a table that has bit column called “Flag” it does not allow NULL. A requirement here is to ALWAYS have Flag=1 set for every Id in the table below but only 1 time per each unique Id and Flag columns combination. At the same time all other rows can be have Flag=0 set multiple times if there a…
How to remove check constraint?
I am having difficult to remove CHECK using Alter in sql. Can anyone help me please? Answer Oracle does have an alter table … drop constraint syntax for this. But since you created an anonymous constraint, so this is tricky – because you don’t know the name of the constraint. One option is t…
ORA-02290: check constraint violated
I keep getting the message “ORA-02290: check constraint violated” whenever I try to insert values into my table. Here’s the code for the table STORE: And here’s the INSERT statements I am trying to accomplish: It has created the 4th, 6th, and 7th values, but not the rest. What is going…
Check constraint before insert a value into the database
I’m trying to create a table to store order_details. The table has a column status that should only be allowed to contain the value true once per each order_id, but may contain the value false multiple times per order_id. I want to do this within the table structure itself. Any help would be appreciated…
Find the row violating the constraint to be added
I’m trying to add a check constraint to a table like ALTER TABLE foo ADD CONSTRAINT bar CHECK (…); and I get the error: ERROR: check constraint “bar” is violated by some row ********** Error ****…
A constraint with function that contains Select is never satisfied
I have a table like this: And I need to forbid any rent time intersection for the same car. I found that, when a function is used (example below) inside the constraint, the value it returns is different from whent it is used outside the constraint. So when I’m trying to insert data into the table, the c…
How to create a constraint for conditional unique values?
I am using SQL Server. I have this table: CREATE TABLE Student ( ID int PRIMARY KEY, FirstName varchar(100), LastName varchar(100), Active bit; ) I want to have unique(FirstName, …