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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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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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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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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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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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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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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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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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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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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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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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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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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1answer
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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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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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2answers
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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
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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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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
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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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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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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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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
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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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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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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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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 ...
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Check all values in a set with PostgreSQL

I'm trying to validate jsonb data with a check constraint to a table that has two fields, header and body, both are jsonb fields, that I expect to be arrays. Here is an equivalent table: CREATE ...
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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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Group by checks constraints are possible?

I have a table with the following columns: TEAM_ID integer, NAME varchar(64), IS_LEADER char(1) not null default 'Y' I want to apply the constraint that, in the same team, only a leader can be ...
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1answer
310 views

Order to disable constraint in a SQL Server Database

I have a DB that every day delete all the data and load new one at the night. To do this an SP disable all constraint with sp_msforeachtable execution. I created some new objects (Schemas, SP, Tables, ...
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1answer
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Create a check constraint across multiple schemas in PostGIS [closed]

I'm a little new to this so apologies up front if my vocabulary is incorrect. I'm trying to create a check constraint that determines whether a new point is located within an existing polygon. The ...
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1answer
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Check and trigger constraints [closed]

Suppose a DB contains two tables A and B as given below: A --------------------- id SERIAL id_b INTEGER -- NOT NULL reference to B.id ts_update TIMESTAMP B --------------------------...
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Fire a trigger function when checks change

I have the following use case: I have a set of different checks on different tables in one schema. If a data set is 'wrong' (did not pass a check) it gets pushed into another table in another schema. ...
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3answers
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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
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Is varchar(x) as fast as `text CHECK ( char_length(x) )`?

In an Twitter exchange, Simon West asks to Brandur, Out of interest, why do use email TEXT CHECK (char_length(email) <= 255) rather than email VARCHAR(255)? Not a pattern I've seen before ...
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Partially-Unique Check Constraints

I have an old Access table which is being migrated to SQL Server, and in it there's a field called "LinkedID". This field was mostly unused until ~5 years ago, so for many historical records it is ...
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Add array table constraints, empty or null if other column is false

I'm adding constraint on an existing table jobs: DROP TABLE IF EXISTS jobs CASCADE; DROP TYPE IF EXISTS job_state; CREATE TYPE job_state AS ENUM ( 'UNSTARTED', 'STARTED', 'FAILED', 'COMPLETED' ); ...
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1answer
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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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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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2answers
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CHECK constraint for array column to verify length > 0

I'm playing with postgres table validation rules and trying to set a CHECK constraint for an array column. An idea is to allow only arrays with length > 0. Here is how I want to implement it: create ...
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1answer
535 views

Implement check constraint for varchar (7) to enforce YYYY-MM

I am considering the following with regards to implementing a check constraint on a column I am calling year_month. My objective is to have a check constraint to enforce YYYY-MM. My intention is to ...
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1answer
377 views

Check Constraints on SQL Server Database advisable for number range & year & month?

I'm busy designing a website and I have a requirement for the following columns in my SQL Server database: allocation (values from 0 to 100) year (only) month (only) I have read about check ...
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Why does adding a simple CHECK constraint take so long on Postgres

I'm using PostgreSQL 9.6.1 on Amazon RDS I'm adding a CHECK constraint on an already indexed column named timestamp_ of a table called event_click that contains about 1 million rows. ALTER TABLE ...
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1answer
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Postgresql partitioned table timestamptz constraint problem

The table reports is partitioned table by day like reports_20170414,reports_20170415 Constraint SQL is defined as follow CHECK ( rpt_datetime >= '2017-04-14 00:00:00+00'::timestamp with time ...
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2answers
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List of values accepted by a column

Table Animal has following columns: SR_ID First_Name Last_Name PET The PET column has a check constraint; hence it only accepts three values DOG, CAT, FISH. Sample Data +-------+-------------+-------...
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Constraint for multiple foreign key yet it's mutually exclusive (PostgreSQL)

Loan table associated to due table. also Invoice table associated to due table. In due table either one of them foreign key should present and other one should be null. What kind of constraint ...