Questions tagged [check-constraints]

That part of declarative referential integrity (DRI) where a column's permitted range of values is enforced by a Boolean predicate.

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Constraint to prevent immediate loop in hierarchy

I have a companies table: CREATE TABLE companies ( id bigserial, name varchar(255) NOT NULL PRIMARY KEY (id) ) I want companies to have parents and childs. A company might have many parent and ...
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Knex pass over db FK constraints

when I try to insert values into my FKs in the DB Browser for SQLite I get the constraints error, but when I run the seeders with knex (npm package) it pass over the FK constraints and it inserts when ...
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how do I restrict a specific row's columns to have only a specific value set?

I have the following table CREATE TABLE `mview_state` ( `state_id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT 'View State ID', `view_id` varchar(255) DEFAULT NULL COMMENT 'View ID', `mode` ...
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1answer
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Check constraint to guarantee ltree ancestors

I ran into an issue where we had a tree structure that looked like this: select title, tree_path from my_table where tree_path <@ '3'; title | tree_path ----------------------- item A | 3 ...
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1answer
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Adding constraint to an existing table column

I have a table that doesnt have any constraint on them like this CREATE TABLE SomeTable ( Id int NOT NULL, Type varchar(50), ) insert into SomeTable values (12,'Exchange-Student'); Now I ...
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1answer
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Is it more efficient to create check constraints on PostgreSQL table before or after bulk load?

I am creating a table in PostgreSQL and bulk load with data first. PostgreSQL's documentation recommends to insert large volumes of data first and then create indexes and foreign key constraints. What'...
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1answer
42 views

Add constraint to table creation in SQL

I have to create a table Product with elements P, PType, PName, Price and Origin. I need to have the constraint that all products with PType "Meat" must have "Europe" as Origin. I ...
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1answer
21 views

Retrieve Names of Check Constraints Specific to a Column

PostgreSQL 12 When I rename a column in a table, I would like to dynamically rename the matching check constraints as well. I have a hypothetical table: CREATE TABLE hypothetical_table ( id SERIAL ...
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1answer
186 views

SQLite, ASCII Characters 0x20 to 0x7E Check Constraint

I have the following table which I'm trying to limit the column name to ASCII characters ranging from 0x20 to 0x7E. Why is it not working? CREATE TABLE test ( id INTEGER NOT NULL, name TEXT ...
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1answer
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PostgreSQL - Removing Unused Index on Check Constraint column

I used the script from this blog to identify the unused index on my database. It returns an index which is on a column called result where I have a check constraint on that column. So removing this ...
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How to implement an association with restrictions

I'm working on an SQL database of useful plants. I'd like to be able to allow users to annotate the plants with a set of hierarchical categories and tags. For example: category: medicine body part: ...
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1answer
339 views

CHECK Constraint to enforce upper case letter and pattern match

For one of my columns I am trying to enforce a pattern. The first letter should be D upper case, and the remaining 3 characters should be digits. For example: D678, D890, D000 I'm quite new with CHECK ...
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Check constraint on a pair of columns

I have a table with this structure: create table licence_report ( id bigint default nextval('licence_report_id_seq'::regclass) not null, created ...
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Enforce NOT NULL for set of columns with a CHECK constraint only for new rows

I have a table and need to add a new column without a default value: Constraint: ALTER TABLE integrations.billables DROP CONSTRAINT IF EXISTS cc_at_least_one_mapping_needed_billables, ADD ...
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373 views

Postgres list constraints that use a stored procedure

I have a postgres database (v9.6) and I have multiple CHECK constraints that use user-defined functions. something like: CREATE TABLE payment ( amount bigint, CONSTRAINT amount_gt_0 CHECK (...
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Disable all constraints and table checks while restoring a dump

I've obtained a dump of my PostgreSQL database with: pg_dump -U user-name -d db-name -f dumpfile which I then proceed to restore in another database with: psql X -U postgres -d db-name-b -f ...
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1answer
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Adding a check constraint on a new column with default value on a large table

I have a large table (1–2m rows) and need to add a column. It is an integer column with a default of 0. I am also adding a check constraint that column >= 0. Currently, I am making the change in ...
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CHECK CONSTRAINT isn't identifying breaches of a constraint but DBCC CHECKCONSTRAINTS does

I have a table full of data and I have a constraint on a field in that table that is setup to ensure the total of 2 fields equals a 3rd field. For example: ALTER TABLE [dbo].[Table1] WITH NOCHECK ADD ...
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Check constraint age 18< [closed]

Hello I need to create a constraint that chekc the user is 18< before listenning to certain songs but idk how... I tried this : ALTER TABLE Historique_ecoute DROP CONSTRAINT IF EXISTS ...
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1answer
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Adding a dropped check-constraint what queries the table

I'm using a Postgres to preist a hierarchical data set; the table I'm using is something like this: CREATE TABLE layers ( bucket text not null, uniq_id serial not null, name ...
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Check constraint on grouped conditions

Take the following table as an example: GroupID AlphaID BetaID 1 0 1 1 1 1 1 2 2 2 0 1 2 1 2 ...
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1answer
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MySQL - is there a way to implement a CHECK constraint after creating the table?

I created a table and after entering all the data, I found that I had missed a CHECK constraint in the CREATE TABLE statement. create table jims_faculty ( fac_id int primary key, fac_name varchar(15) ...
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How can I enforce that values in a table column match the Regular Expression “[axyto0-9\s]{0,2}[\s0-9]{0,10}”?

I have a table as below CREATE TABLE dbo.DemoTable ( Value VARCHAR(12) ) I would like to constrain it to only contain rows where Value matches the following pattern [axyto0-9\s]{0,2}[\s0-9]{0,10} ...
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1answer
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Can I tell Postgres that a new constraint is valid without actually running the check?

I have a constraint that ensures one of three columns is populated, and I'm adding a new column, so I'm replacing the old constraint with a four-column version. Since I know from the old constraint ...
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2answers
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Should fields that are set to Not Null also have a constraint refusing empty strings?

Any field that I would expect a value (Like an orderNumber or customerNumber) I would set as not nullable. If I'm expecting the value of the field to be not null, shouldn't I also always have a ...
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3answers
158 views

Foreign key reference to column that is no primary key

I know, foreign keys should uniquely identify rows and therefore reference a primary key. However, consider my example: There are 4 pre-defined categories, and for some combinations of values for ...
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Sqlite - Limit Characters for different parts of one String with Check

I have to make sure that any inserted Email has the format: "X@Y.Z" X and Y may only contain letters and numbers and Z can only have Letters. I tried something like this, but i cant figure out how ...
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Best way to handle this type of constraint

Guidance please. We have a small configuration table where we need to ensure only 1 record has bit checked. In the past, we have done check constraint with function that checks count, which we are ...
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ALTER TABLE CHECK CONSTRAINT

From the Object Explorer in SQL Server, when selecting and scripting a foreign-key constraint, the following code is generated. USE [MyTestDatabase] GO ALTER TABLE [dbo].[T2] WITH ...
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1answer
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Constraints between tables on a variable

im aiming to add a constraint on the number of bicycles allowed to be stored in each terminal - the number differing between terminals. These are my original tables create table terminal( ...
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1answer
311 views

CHECK constraint to limit certain rows

I have the task to create an EAV table with some constraints. Attributes are foreign keys and some values are also from other tables (not realized as foreign key, but as a CHECK constraint). On this ...
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1answer
1k views

Compound unique constraint with NULL values

With the following table structure CREATE TABLE favorite_comments( id SERIAL PRIMARY KEY NOT NULL, opinion_id BIGINT REFERENCES opinions(id), review_id BIGINT REFERENCES reviews(id), ...
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What is the difference between CHECK and CONSTRAINT CHECK?

is there any difference between the follow exemples? ProjNum int CONSTRAINT nn_ProjNum NOT NULL CONSTRAINT C_ProjNum CHECK (ProjNum >= 10) and ProjNum int NOT NULL CHECK (...
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1answer
427 views

Constrain array values to an allowed set of values

I would like to set up a CHECK constraint that makes sure that a text[] column's elements contain only certain values. Setting up an example: CREATE TABLE foo( countries text[] ); INSERT INTO foo ...
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3answers
11k views

Create a Constraint such that only one of two fields must be filled

I have a table in SQL server where the users need to enter data in either of two columns. That is, One of the two must have data inputted but at the same time i don't want to allow users to input in ...
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1answer
753 views

Create a foreign key to a table that doesn't exist in postgres

I'm trying to put together a solution where I have a bunch of script files that contain my schema creation. Something similar to Visual Studio's SQL Project, but for Postgres. My problem is that the ...
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A table with all fields NULLable with important, sensitive data

I have a requirement for a database table to hold sensitive patient information about their lifestyle (alcohol/ drug use / injecting etc). On screen the information is sectioned into tabs - "alcohol",...
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1answer
290 views

Enforcing a “disjoint or identical” constraint

Suppose that F is an Oracle table with two columns, X and Y, such that the constraint CONSTRAINT unique_xy_pairs UNIQUE (X, Y) is satisfied. For each value [x] of F.X, let S[x] represent the set ...
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1answer
261 views

Building a conditional check constraint

I'm trying to build a conditional check constraint for my table TBL_AFIL, which has two fields: Fec_Renun DATE flg_afil INTEGER Constraint: IF flg_afil=1 THEN Fec_Renun can not be NULL. ALTER TABLE ...
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2answers
672 views

Add Constraint to check value exists in a non-unique composite key column

I have the following table, which has a composite primary key: CREATE TABLE dbo.Seqs( SequenceKey nvarchar(10) NOT NULL, UsageSequence smallint NOT NULL, col1 bit NOT NULL, col2 ...
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1answer
696 views

How to Add Check Constraint between Tables (or change DDL)?

Given the following PostgreSQL table definitions: postgres=# create table if not exists messages( postgres(# id serial primary key, postgres(# max_length smallint not null check (max_length &...
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538 views

Set a check constraint for a set of conditions which aren't universally true [closed]

I need to make sure my database is self-consistent. There are two columns, which share a relationship when there is some specific value the other should be not null. I tried using constraint check (...
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1answer
781 views

Create Table with Int-attribute which can only use values between 6 and 36

Hello I'm learning for my databases examination and in one exercise they asking for creating a table with a attribute which can only use values between 6 and 36. How do I solve it? We used in the ...
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1answer
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Created Check Constraint WITH NOCHECK - still trusted

I needed to alter the conditions of existing constraint - so I dropped it and recreated with the new conditions. This failed, because there were 800k+ rows, that didn't meet the condition. That ...
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1answer
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Error on Check Contraint that is on a Column with a Default Constraint

Inspired by this article, I wanted to test the idea before I considered implementing it. However, I get this error Msg 547, Level 16, State 0, Line 14 The INSERT statement conflicted with the ...
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1answer
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Is ALTER TABLE CHECK CONSTRAINT redundant?

I created a table with a foreign key constraint on it. When I generate a table creation script through SSMS, it creates the following code: ALTER TABLE [dbo].[MainTable] WITH CHECK ADD CONSTRAINT [...
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51 views

Ensuring Uniqueness Across Columns

I'll lead with this: Perhaps the database design is wrong, so I will accept a re-design as a solution! Consider the following table: ID | TypeA | RefA | TypeB | RefB -- + ----- + ---- + ----- + ---- ...
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Table check contraint to verify unique on specific value

Oracle 10g: Suppose the following table (T_REGISTER): ID_PROCESS PERIOD CUSTOMER STATUS =========================================== 0001234 201801 12300344 INVALID 0001236 ...
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What are sensible/rational character limits in a database e.g. for a persons name

This is a general question about database admin. Is there some kind of standardization for character limits on fields in a DB? It makes sense to specify character limits on the database end for names,...
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How to make a column mandatory in every Insert / Update (not meaning default null)

Following table: CREATE TABLE kontrolle.negativtext ( id serial NOT NULL, ausschluss character varying(255) NOT NULL, nur_domains character varying(255)[] NOT NULL DEFAULT '{}'::character ...