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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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sql CHECK constraint not working properly

I have created a table schedule with a check constraint: mysql> create table schedule(order_date date, dely_date date check(dely_date>order_date)); Query OK, 0 rows affected (0.50 sec) When I insert a value which…
user3297764
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check constraint won't work mysql

check constraint won't work CREATE TABLE IF NOT EXISTS supervisor ( sup_id INT(3) NOT NULL, sup_name VARCHAR(30) NOT NULL, gen VARCHAR(1) NOT NULL CHECK (gen='M' or gen='F'), dep_id INT(4), PRIMARY KEY (sup_id), INDEX (dep_id), FOREIGN KEY…
terrible programming
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Check Constraint to Confirm Exactly One is not NULL

I have a table with the columns CompaniesId and HotelsId. I want to write a check constraint that confirms that one of these columns is null and other one is not. I tried the following expression: (CompaniesId is null) <> (HotelsId is null) When I…
Jonathan Wood
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How to restrict an Oracle apex item to numeric/character values

I have a TEXT item field - order number, where user can enter his details. When a user enters order number starting with 1, it should allow only numeric values. When a user enters order number starting with L, it should accept both numeric and…
Gayathri
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Check Constraints in Access

I'm working on an Access database, and I want to save a Check Constraint as a query. Is that even possible in Access?? Anyhow, this is my Query: ALTER TABLE LEVERANCIER ADD CONSTRAINT chk_postcode CHECK( NOT EXISTS( SELECT levnr, postcode FROM…
Rosario
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SQL Server Constraints Across Tables

I have a SQL Server database with an Apartment table (which has columns FloorNum and BuildingID) and an ApartmentBuilding table (with column NumFloors). Is there any way to set up a constraint (using the SQL Server UI) to check that…
chama
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how to create date check in postgresql

When creating a table in postgres of type time its very simple to set a time check, to make sure that what is entered has to be between two times like so: extime TIME NOT NULL, check(extime > '09:00:00' and extime < '18:00:00') I…
user4292810
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How to specify the cardinality of a @OneToMany in EclipseLink/JPA

I'm trying to impose a @Oneto7 association. I'd have imagined an attribute that specifies the target many value, but have found none. If there is no such attribute, how else, in JPA/EclipseLink would one achieve it?
simpatico
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SQL Server constraint to permit "two unique" values

I have a table like this one: id fk_id 1 1 2 1 3 2 4 3 5 3 The field fk_id references another table, I want to create a constraint to permit max two insertion with each fk_id. I want to prevent this: id …
Charles Cavalcante
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Check constraint violation before After Update trigger fires

I have a table which has a bit column and a corresponding datetime2 column which tracks when that flag was set: CREATE TABLE MyTable ( Id int primary key identity, Processed bit not null, DateTimeProcessed datetime2 ) I've added a check…
grin0048
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Oracle - Check constraint on multiple columns

I am trying to add a check constraint on multiple columns in Oracle table that restricts user from inserting NULL into 3 columns simultaneously. However each column in the table can accept NULL independently but not 3 of the columns together. ALTER…
user3773317
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SQL Server Check Contraint and checking Signed In/Out state

I have a table that functions as an event log and stores the users signed in state, 'In', 'Out', or 'Rejected' (sometimes users my be 'Rejected' based on external criteria). Here is some sample data so you can get an idea of what the table looks…
David Murdoch
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SQL Server 2012: Check Constraint with Default Values

I have the following Column EffectiveDate Date NOT NULL default getDate(), CONSTRAINT chk_EffectiveDate CHECK (EffectiveDate >= getDate() AND EffectiveDate <= TerminationDate ) , TerminationDate Date NOT NULL default '12/31/9999', …
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oracle check constraint "in" clause and "like" clause

I would like to know what is the different between 'in' clause and 'like' clause oracle in check constraint. here is sample code for 'in' clause ALTER TABLE EXPREPORT ADD CONSTRAINT EXPREPORT_CHK1 CHECK (EXPREPSTATUS IN ('PENDING', 'APPROVED',…
user3051767
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Add Check Constraint not working SQL

I need to add a constraint to a table such that column ab is always greater than column h. I have tried ALTER TABLE batting ADD constraint possibleHits check (ab>h); But that returns ERROR: check constraint "possiblehits" is violated by some…
thermite
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