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CREATE TABLE Project (projectID INTEGER, startDate TEXT, endDate TEXT)
INSERT INTO Project VALUES (1, '2021-05-15', '2021-08-31'), (2, '2021-06-01', '2021-06-30');
CREATE TABLE Plan ( pID varchar(255) NOT NULL UNIQUE, projectID varchar(255) NOT NULL UNIQUE, name varchar(255) NOT NULL DEFAULT ' ', startDate DATE NOT NULL DEFAULT '2000-12-31', endDate DARE NOT NULL DEFAULT '2000-12-31' CHECK (JulianDay(startDate) <= JulianDay(endDate)), PRIMARY KEY (pID, projectID), FOREIGN KEY (projectID) REFERENCES Project(projectID) );
CREATE TRIGGER trg_ins_plan BEFORE INSERT ON Plan BEGIN SELECT CASE WHEN NOT EXISTS ( SELECT 1 FROM Project p WHERE p.projectID = NEW.projectID AND p.startDate <= NEW.startDate AND p.endDate >= NEW.endDate ) THEN RAISE(ABORT, 'Invalid dates') END; END;
INSERT INTO Plan VALUES (1, 1, 'name1', '2021-05-31', '2021-08-01')
INSERT INTO Plan VALUES (1, 1, 'name1', '2021-03-31', '2021-08-01')
Invalid dates
CREATE TRIGGER trg_upd_plan BEFORE UPDATE ON Plan BEGIN SELECT CASE WHEN NOT EXISTS ( SELECT 1 FROM Project p WHERE p.projectID = NEW.projectID AND p.startDate <= NEW.startDate AND p.endDate >= NEW.endDate ) THEN RAISE(ABORT, 'Invalid dates') END; END;
UPDATE Plan SET startDate = '2021-06-30' WHERE pID = 1;
UPDATE Plan SET startDate = '2021-03-31' WHERE pID = 1;
Invalid dates