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CREATE TABLE customer(customer_id NUMBER(6) PRIMARY KEY
, customer_name VARCHAR2(40) NOT NULL
, customer_address VARCHAR2(60) NOT NULL
, customer_email VARCHAR2(35)
, customer_number NUMBER (11) NOT NULL CHECK LENGTH(customer_number) = 11)
This is just taking the mick I don’t understand what is wrong
You’re not specifying a constraint name, and I believe that you need to have the check constraint in brackets:
Take a look at http://www.techonthenet.com/oracle/check.php