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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 DDL - 2 CHECK Constraints on 1 Attribute

Below is DDL for the table I want to create. However, I want the attribute 'Appointment_datetime' to be a future date and during working hours (between 8:00AM and 5:00PM). I can get the future date part with -'CHECK (Appointment_datetime >=…
AbdulHollings
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CHECK Constraint For Allowing X Duplicates In Column

I wasn't sure if this is something that can be done in a CHECK constraint or if this requires a Stored Procedure for validating during insert, but can a constraint be created to allow only X amount of duplicates in a column, where X > 1? Something…
JNYRanger
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Postgres constraint on field to reference table name

How do you ensure that a field's values reference an existing table's name in a schema? For example, in the following, how would I get the properties field in the item table to effectively make an ELEMENT REFERENCES on the table names in the…
Katie
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Add Foreign Key to information_schema.tables

I would like to have a table with a column that references another table (not reference a column in another table). I'm using SQL Server 2008 R2 So i have tblA, tblB and tblC. tblA has a colum "OtherTable" of varchar. I want a Foreign Key Contraint…
wertzui
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Write a check constraint on columns from two tables

I have this simple database I'm working on as assignment in university: I don't need full solution, I just need the way it work. 1: UsageCount : how many times they used the question in past exams. 2: CorrectAnswerCount : how many student Answered…
Fares B Bader
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checking a value with a check constraint name or check clause in a database function or procedure

I'm working on a sql server database to populate fake data with faker-factory in python. Let's say I have a table named TABLE_OTHER with a column F1 of datatype int. And there is a check constraint name CHK_F1 with clause F1>0. I want to insert a…
Amir Hossain
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The check keyword not working in sql management studio

I have two tables tblA and tblB. And a constraint called tblA_tblB_FK is created between these tables. I wanted to update both columns in tables chained with tblA_tblB_FK constraint. While reading different posts I thought the best way is to…
Rey
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Using Microsoft SQL Management Studio, make a constraint depend on a user-generated function

So there's a couple problems I'm running into regarding getting this to work. Here's the function: CREATE FUNCTION RSO_Affiliation_AdminID_is_Admin_Enforcer @Admin_ID nvarchar(50) RETURNS INT AS BEGIN DECLARE @ACCESS nvarchar(50) SET @ACCESS =…
user3409084
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Oracle Database Can set Constraint for Upper Case Values?

Is there anyway that we can set a constraint in database table level to have upper or lower case values for certain columns? When we create a table, we can set NOT NULL to avoid having null values on a column. Same way, can we do that for either…
user3123690
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SQL Server message 547

I want to make Kode_Barang 7 character with first character Must 'B' and the the remaining character must be a number [1-9] I have create query for Kode_Barang just like this : Kode_Barang CHAR(7) PRIMARY KEY CHECK(LEN(Kode_Barang)=7 AND…
Denni S
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SQL Constraint to Enforce Rule

if I have tables like this: GROUP(**GID**, DESC) -- GID IS PK USER(**UID**, FIRST, LAST, GID) -- UID IS PK, GID IS FK A group can have multiple users but a user can belong to only one group. How would I enforce rule so that an employee can…
pixel
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Function to update a status flag for validity of other column?

How to create a function that compares card_id with allowed_cards array elements? If it's in this array, column status must be updated to TRUE. CREATE TABLE client_1 ( id bigint NOT NULL, "time" timestamp without time zone DEFAULT now(), …
Shohruh Raxmatov
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SQL "cannot find function or aggregate" of scalar function

I created a sql function to verify that a year is a valid number. Now I am creating a function to make sure if param1 is non-null, param2 must also be non-null. For whatever reason the dbo.fun_chk_year works great, but dbo.fun_chk_req…
user2825184
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SQL Check Constraint - How to check for specific format?

I am trying to add a CHECK constraint to my column for a football game score. The format has to be like such --> 4-2 (with the hyphen) Also both numbers cannot exceed 999. Below is what I have so far which obviously does not work..Any ideas? Column…
Tester45
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Is it possible to convert datatype when alter the table with check constraint in postgresql

Here, I am only going to get CheckListNo (integer) from select statement "Check_No" ( character varying). when am execute this, error showing like this 'operator does not exist: character varying = integer'. So, I want to check without changing…
Anand Vignesh A
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