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Questions tagged [check-constraints]

CHECK constraints enforce domain integrity by limiting the values that are accepted by one or more columns.

SQL CHECK constraints enforce domain integrity by limiting the values that are accepted by one or more columns.

You can create a CHECK constraint with any logical (Boolean) expression that returns TRUE or FALSE based on the logical operators. For example, the range of values for a salary column can be limited by creating a CHECK constraint that allows for only data that ranges from $15,000 through $100,000. This prevents salaries from being entered beyond the regular salary range. The logical expression would be the following: salary >= 15000 AND salary <= 100000.

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Use check constraint on a column based on the value of a column in another table

I have one table: CREATE TABLE teams ( id INTEGER PRIMARY KEY, member_count INTEGER NOT NULL ); I have another table: CREATE TABLE members ( id INTEGER PRIMARY KEY, team_id INTEGER, member_number INTEGER FOREIGN KEY…
Hernan
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Oracle SQL - check constraint

This check constraint isn't working for me: ALTER TABLE tab1 ADD CONSTRAINT CHK1 CHECK (col1 in ('val1','val2','val3','val4') and (col2='0' or col2 IS NULL)) ENABLE; What I need is if col1 contains any of the mentioned 4 values, then col2 has to…
sp123
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PostgreSQL: check constraint validation before uniqueness constraint on UPSERT

Purpose: I want to trigger CHECK constraint validation after uniqueness constraint validation. Consider the following table definition: CREATE TABLE IF NOT EXISTS counters ( id SERIAL PRIMARY KEY, name TEXT NOT NULL UNIQUE, val INT NOT NULL…
Alechko
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Oracle SQL Developer limit number of character of datatype char(5)

I was tasked to implement a table with a variable groupcode. There are several requirements. char(5) 2 or 4 uppercase letters plus 1 digit whose value is between 1 and 4 (e.g., AA1, AABB1) Any input other violating point 1 and 2 should be…
Andes Lam
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not null constraint inside a jsonb array in postgres

How to have not null constraint inside a jsonb column in Postgres. I have created a Postgres table with just one column called id like this below create table tablea ( id jsonb, check ((id->>'test1', id->>'test2') != (null, null)) ); The…
Abhishek
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How to remove CHECK in MySQL?

I want to DROP check from my table. When I am using this query in MySQL , I am not getting any name of check constraint . SHOW CREATE TABLE test CREATE TABLE `test (``ID` int(11) NOT NULL AUTO_INCREMENT, `price` int(11) DEFAULT NULL CHECK (`price`…
KAMRUL HASAN
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How to create a CHECK constraint to allow certain strings in a table - MYSQL 8

I need to make it possible to only store the values of 'FIRST', 'BUSINESS' OR 'ECONOMY' in a table. However when I try to do this, the error is shown as: Error 3819. Check constraint 'seat_check1' is violated. I have looked through the insert…
bean
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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…
as2d3
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How to remove check constraint in mysql workbench 8.0?

Can anyone give me the command to remove the check constraint in workbench please? I used alter table details drop check details_chk_1; but it isnt working. It shows error in drop command. pls help
Roshwin Lobo
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A constraint with function that contains Select is never satisfied

I have a table like this: CREATE TABLE CarRentSchedule ( carId INTEGER NOT NULL, rent_start INTEGER NOT NULL, rent_end INTEGER NOT NULL, personId INTEGER NOT NULL, tariff INTEGER NOT NULL, PRIMARY KEY carId, FOREIGN KEY…
daaibraanies
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Regarding check constraint null values

CREATE TABLE A ( one INT CHECK (one > 0), two INT CHECK (two > 0), three INT CHECK (three > 0), four INT CONSTRAINT ok CHECK ( four < one + two + three), PRIMARY KEY (one, two) ); I have the following table above. Fields one, two,…
K Split X
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SQL: Check Constraints to force a regex of arbitrary length?

I'm new to regex and I'm using Postgres. I'm trying to make a check constraint in a table so that any data into some column always checks for only alphanumeric, numeric, alphanumeric without spaces, etc. For example, given a table like: CREATE TABLE…
Dialvive
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Django CheckConstraint to check user from different models

I have the following models: class Project(models.Model): """ Handles the user projects """ #--> Fields name = models.CharField( verbose_name = ('Name'), max_length = 300, help_text = ('The name of the…
kbr85
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How to guarantee a table with exactly one row and one column?

Using PostgreSQL 11.5. I need to allow a table to only allow one row and one column in it (not 0 or 2, exactly 1). I feel like ADD CONSTRAINT would be useful but I'm not sure what to do. I'd like to be able to update this row when needed. Something…
leetbacoon
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How can I ensure that Column_A can only have a value if Column_B is NULL? And vice versa

I'm attempting to create a table that has three columns: id paid_at failed_at How can I make sure that paid_at can only have a value if failed_at is NULL? Here is my current code: CREATE TABLE charges( id TEXT NOT NULL PRIMARY…
judgejab
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