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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 do I set Maximum Value of a Column in MYSQL?

I have Table called WORKERS, and the Table consists of totalNumberOfWorkers, i want to set the maximum value of the worker to be 30 and it shouldn't exceed over 30, it should be in the range of 0 to 30. I have tried this, but it doesn't work and…
Tormare Bap
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Add FK / Constraint to subsection of table

Setup Here's two simplified* tables that illustrate the problem I have *The actual tables are built such that I can't really refactor the columns or split them apart easily Table: CodeValues | CodeSet | CodeValue | CodeText…
KyleMit
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How to use a recursive CTE in a check constraint?

I'm trying to create a check constraint on a table so that ParentID is never a descendant of current record For instance, I have a table Categories, with the following fields ID, Name, ParentID I have the following CTE WITH Children AS (SELECT ID AS…
Yisroel M. Olewski
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Is there any difference between inline and out-of-line constraint in sql?

Which one to use or which one is the better? There's any difference? searchtype_id bigint NOT NULL or CONSTRAINT searchtype_id_nn CHECK ((searchtype_id IS NOT NULL))
Botond Hegyi
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SQL Server : Check Constraint expression

I have a check constraint in SQL Server that only allows 3 possible values, the expression is like this: (([READ_WRITE] = 'H' OR [READ_WRITE] = 'W' OR [READ_WRITE] = 'R')) I want to update this check constraint with a query because I don't have…
ctsinavos
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UNIQUE inside CHECK constraint

This question is new twist of An IF inside a check constraint SQL. I want to do something similar to the following check (which throws an ORA-00936: missing expression exception): ALTER TABLE t_table ADD CONSTRAINT chk_unique_active CHECK (…
JLM
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Unique value constraint across multiple columns

Suppose, I have the following table: CREATE TABLE "user" ( id BIGINT PRIMARY KEY NOT NULL, phone1 VARCHAR, phone2 VARCHAR ); And I need to implement the following limitation: all phone numbers (if any) in table must be unique. i.e…
Marat Safin
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How to do alter table using Check Constraint - SQL Server

CREATE TABLE publishers ( PublisherName varchar(75), City varchar(35), PublisherState char(2), Country varchar(4) ) GO -- modify publishers so that state must be two letters ALTER TABLE…
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Can I depend on check constraint to ensure non-negative balance?

I currently have a table as follows: CREATE TABLE Account ( ID int NOT NULL, Balance int, CHECK (Balance>=0) ); I also have some application pseudo-code as follows: function updateBalance(id Int, howMuch Int) { check howMuch is non zero (can be…
Jus12
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Check constraint for mysql

Can anyone help me correctly write the correct syntax for a CHECK CONSTRAINT IN MYSQL. My table is as follows and am having an error on declaring a CHECK constraint for STATUS. CREATE TABLE EventRequest ( EventNo CHAR(8) NOT NULL, DateHeld DATE NOT…
Tonde Wangu
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One Bowler can not bowl two consecutive over in cricket

I am working on Cricket Project. I have a table OverDetails. I want to insert data in this table. ID OverNumber BowlerID InningsID 1 1 150 1 2 4 160 1 3 3 165 1 4 2 …
Ishtiaq Ahmed
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Check constraint over two columns

I want to add a Check Constraint to a table for server 2005 but cannot work it out. MemberId ClubId MeetingId 1 100 10 2 100 10 3 100 10 7 101 10 <-This would throw a check constraint 1 100 11 2 …
Rippo
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Check constraint based on information in another table

Given two tables: TableA ( id : primary key, type : tinyint, ... ) TableB ( id : primary key, tableAId : foreign key to TableA.id, ... ) There is a check constraint on TableA.type with permitted values of (0, 1, 2, 3).…
Andrey Pesoshin
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Oracle check constraints

How do you make if constraints in Oracle SQL? Create Table A( b varchar(25) primary key, c varchar(25), constraint b_1 check(b='name' and c != 'notallowed') );   The following should not work: Insert into A values('name','notallowed'); But this…
Barney Stinson
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Oracle Constraint and null values

On an Oracle DB, if I have a Nullable column and a check constraint on the same column restricting the values to, say, 'ABC' or 'DEF', can I insert a row with a null value in that column (given that null is not one of the constraint values)?
CodeClimber
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