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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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How to add a check constraint in django model that a field value startwith letter 'c' or 'e' or 'a'

How to add a check constraint in django model that a field value startwith letter 'c' or 'e' or 'a' like the bellow SQL check constraint CREATE TABLE Account ( account_no varchar(12), FirstName varchar(255), Age int, City…
tjtharappel
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How to include "CHECK" constraint to backup done via phpMyAdmin?

When I export my database from phpMyAdmin (quick method), it does not include CHECK constraints. However, when I run SHOW CREATE TABLE table, I see the constraints. Moreover, foreign constraints are backed up. In addition, when I take the backup…
xerez
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Prevent Postgres column to be EMPTY using supabase & prisma

I've started a new project using Prisma & Supabase but I'm facing an issue. I have some required String columns. Is there a way to prevent those columns to accept empty string value (''). Do you know if this can be done at the prisma schema level…
BghinC
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CHECK constraint evaluation in SQL 92

when is check constraint evaluated as per SQL 92 standards? create table a ( val INT ); create table b ( f CHECK ( f in (SELECT val from a)) ); a) Is CHECK with sub-query allowed as per SQL-92 standards? b) If yes, When is CHECK…
Khushit Shah
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How to write a check constraint to verify if login is correct or not?

I searched the internet for 2 days to find the answer and couldn't. Basically I have this as a problem : "The login is composed of the first letter of the first name and the first 7 letters of the name (in lowercase) followed by two numbers." My…
ppenguin
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Ensure array column are disjoint sets in postgres

If I have a table with a column with an array of strings, how can I create a constraint to ensure that the arrays in all rows are disjoint sets (ie. no string is present in the array in more than one row)? This would be for postgres, need a gin…
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Sql Server Ce 3.5 Check Constraints

Does Sql Server ce Suports Check Constraints? I wanted to do something like "ALTER TABLE WITH NOCHECK ADD CONSTRAINT id_range_check CHECK ( BETWEEN and ) and this will give an error on 'WITH'
Bee gud
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No limitation on SQL column data type

I have SQLite database (created in SQLiteStudio). The DDL is this: CREATE TABLE player ( player_id INTEGER PRIMARY KEY ASC AUTOINCREMENT UNIQUE NOT NULL, …
synalice
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Why can't I add a column to an existing table with a checkConstraint that references other columns in SQL

I'm using SQL Server and am trying to add a column and a check constraint. I've found that the following works: ALTER TABLE table.column ADD isTrue BIT GO ALTER TABLE table.column ADD CONSTRAINT CK_table_isTrue CHECK ((isTrue = 1 AND…
hikarunoryoma
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Sql constraint error references other column

I don't know a lot of mysql and have an error in my sql script. Currently running mysql 8.0.24. Does anyone know what might be the problem? Error: https://prnt.sc/226xk5x Sql: -- Dumping structure for table gtav_rp2._vehicle CREATE TABLE IF NOT…
Jens00
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Is it possible to perform a CHECK constraint with data referencing other table (Foreign key) in MySQL?

I am trying to validate a JSON column given a schema on a different table. Since a foreign key constraint is also set I can guarantee that a schema is assigned. The following sql code is not valid on MySQL, however it should translate what I am…
Exprove
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Check digit constraint in SQLite

I'm trying to create a constraint for an id (5 digits in length) where the 5th digit is the last digit of the value (1 x d1 + 3 x d2 + 1 x d3 + 3 x d4). For instance, if the first four characters of the id are 1234, then the fifth digit is the last…
Joan
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How check UniqueConstraint in Django with CreateView and custom forms if field set in view?

I do: I define UniqueConstraint (also try with 'unique_together') in model: class Project(models.Model): class Meta: constraints = [ models.UniqueConstraint( fields=['company', 'name'],…
Fedіr Yatsenko
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PostgreSQL - Multiple constraints

I want to add several CHECK CONSTRAINTS to a PostgreSQL 13 table. In natural language logic is : if a field contain a defined value, an other field must be filled. I have several scenarios to combine. When I add just one constraint it's ok, but when…
GeoGyro
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Sql Server - Constraint - Sequelize - Allow to set column A only if column B is null and vice-versa

The question I'm asking has been answered before here: Sql Server - Constraint - Allow to set column A only if column B is null and vice-versa However, I'm not sure how to implement this in sequelize. I noticed sequelize has a validator option you…
Joseph Astrahan
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