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Tag: check-constraints

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: However a less verbose way of writing this does not work: The following error is output: Column CHECK constraint for column ‘isTrue’ references another column, table ‘table’. Looking at docs and SO I was unable to determine why this

non UNIQUE constraints

So, I got in this situation: I create a table (let say model_a), in this table I have 2 cols (let say col1 and col2). I need a constraint that satisfy this reality: It’s not UNIQUE constraint, you can duplicate the first row. The only one time this constraint active is col1 is the same but col2 is different. Need

Create a table for following condition

condition for the problem to be solved: The code i tried to do is I couldn’t solve the first condition and so i am getting right parenthesis missing for final condition Answer I would translate your requirement as follows: Changes to your original code: you want NUMERIC rather than NUMBER ArCode must be declared as PRIMARY KEY, and needs a

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