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Is it possible to delete check constraint(no constraint name declared) that is created within CREATE TABLE command?
Run the below query to find the list of check constraints in your table, including what they are checking for:
select constraint_name, search_condition
where table_name = 'Your table name'
and constraint_type = 'C' -- To filter Check constraints alone
Copy the name of the relevant constraint and paste it in the Alter table drop constraint command.
Alter table drop constraint
Alter Table Your_table_name
Drop Constraint constraint_name; -- Replace constraint_name from above query result