eTutor XQuery und Datalog - Data & Knowledge Engineering

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Anhang 75
CREATE TABLE etutor_xquery.exercise (
id NUMBER NOT NULL,
query VARCHAR2(1000) NOT NULL,
gradings NUMBER,
points NUMBER(4, 1),
CONSTRAINT ex_grad_id FOREIGN KEY(gradings)
REFERENCES etutor_xquery.error_grading_group(id),
CONSTRAINT ex_id PRIMARY KEY(id));