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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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Add a tuple-based CHECK constraint to a table

I have a table PC that has 5 columns: CREATE TABLE PC ( model VARCHAR(25), speed FLOAT, ram, INT, hd INT, price FLOAT, PRIMARY KEY (model) ); I have to add a tuple-based CHECK constraint to verify that a PC with a speed…
Triwis
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Constraint Violated in SQL

I created the table as: CREATE TABLE SALES_ORDER2_56 ( ORDERNO VARCHAR2 (6) CONSTRAINT SOpkey1 PRIMARY KEY CONSTRAINT SOcheck1 CHECK (ORDERNO LIKE 'O%'), CLIENTNO VARCHAR2 (6) CONSTRAINT SOfkey1 REFERENCES CLIENT_MASTER2_56 (CLIENTNO), …
Suman
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Defining range CHECKs on INTERVAL columns (PostgreSQL)

I am currently designing a database that has to deal with a lot of temporal data. Consequently, there are quite a few columns which ought to hold time interval-like values. The important thing is that every one of these values has to fit into a…
Priidu Neemre
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SQL Server - Add Constraint for existing table using Alter Table function

I got a little trouble with SQL. This is the table Customers : ID Name Address Phone KP001 Bill Jl Bali NO 27 81976524451 KP002 Jane Jl Sandang NO 5 81876537521 KP003 Dion Jl Kebon Jeruk NO 7…
cindy
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SQL Server - Add Constraint using CHARINDEX and Isnumeric

I got a little trouble with SQL. This is the table Customers : ID Name Address Phone KP001 Bill Jl Bali NO 27 81976524451 KP002 Jane Jl Sandang NO 5 81876537521 KP003 Dion Jl Kebon Jeruk NO…
cindy
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Using a function in a SQL CHECK constraint

I am trying to replace simple CHECK constraint with an embedded function within a CHECK constraint however it doesn't seem to restrict the data I can enter. The constraint is to prevent product amount of less than 0.25 and more than 5,000. The…
user3062656
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Why doesn't this Check constraint work?

I have created a check constraint in SQL Server 2005, but this check constraint doesn't work. The SQL Server Management Studio tells me by an insert statement the following message: Msg 547, Level 16, State 0, Line 1 The INSERT statement…
nikola.stankovic
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Is it possible to make a "not modify " constrain on MongoDb subdocuments at creation?

I'd like to make a specific subdocument value from a MondoDb document fixed, so it can not be possible to modify it at a next update, or any other MongoDb operations that can modify documents. For example, if a document like the one bellow is…
Roxana
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How to add a constraint to a table in mysql, so a client is only allowed to have 10 products in its possession?

The case is about a client who can reserve films. But he is only allowed to have a max of 10 films in his possession at any given time. What check constraint do I need to let this work? The code to create my database is as followed: CREATE TABLE…
user2493001
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CHECK constraint between columns

Hi I am trying to use the CHECK constraint to stop one row from being larger than the other. create table myTable ( begin int(10), end int(10), check (begin < end) ); The table is created however there is no constraint being applied when inserting…
user2447832
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Creating a check constraint for multiple specific inputs

I assumed it would be fine to execute SQL ommand something like this Installation' OR 'Software Repair' This didn't work so well so I tried This didn't go so great either, I got a missing expression for Data Recovery This gave me a cannot validate…
Jim
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MySQL workbench: Check constrain in trigger

So i have created this table in MySQL Workbench called iOwe. It has a column called Pass(Y/N) on which i'd like to have a check constrain incorporated, which takes only the values "Y" or "N". I understand that check constrains don't work on MySQL,…
Anonymous Person
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select in check constraint

I want to create a check constraint for my table, where you can't add new line, if the new booking range(start_date, end_date) have intersect with an already submitted row. But i can't place query in a check constraint. Do you have an idea how to do…
Bergkamp
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MySQL Check Constraint for email addresses

I'm trying to add a check constraint on MySQL to only allow valid email addresses and from what I have already syntax appears to be: Alter Table book Add Constraint CheckEmail Check (email Like '%@%._%') My table is book and it has a column…
daithi_dearg
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CHECK constraint Alternative in MySQL

hi i am trying to use CHECK constraint form MySQL , i got an example from w3 schools. MySQL: CREATE TABLE Persons ( P_Id int NOT NULL, LastName varchar(255) NOT NULL, FirstName varchar(255), Address varchar(255), City varchar(255), CHECK…
Kanishka Panamaldeniya
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