Question : SQL Query question

I have two columns (ColA, ColB) in a table (Table1) that must fulfil
certain combination of values. How can I stop SQL query to execute if
the query tries to update or insert an invalid combination of values?

Example:
if Table1.ColA equals 'ABC' then Table1.ColB must be equal 'XYZ'.

An update query should fail similar to the check constraint and
the data remains as it is. An insert query should fail as well
and the table will not have an extra invalid record.

Answer : SQL Query question

Create a check constraint on the table, with the condition in the Check

Here's a sample

alter table products add constraint ck_product check (len(Name) > len(FamilyCode))