27
CREATE TABLE subject (
28
subjectid SERIAL PRIMARY KEY NOT NULL,
29
subj_code VARCHAR UNIQUE NOT NULL,
30
subj_name VARCHAR NOT NULL,
31
subj_short_name VARCHAR UNIQUE NOT NULL,
35
CREATE TABLE semester (
36
semesterid SERIAL PRIMARY KEY NOT NULL,
37
year CHAR(4) NOT NULL,
38
semester CHAR(1) NOT NULL,
40
UNIQUE (year, semester)
43
CREATE OR REPLACE FUNCTION deactivate_semester_enrolments_update()
46
IF OLD.active = true AND NEW.active = false THEN
47
UPDATE enrolment SET active=false WHERE offeringid IN (
48
SELECT offeringid FROM offering WHERE offering.semesterid = NEW.semesterid);
54
CREATE TRIGGER deactivate_semester_enrolments
55
AFTER UPDATE ON semester
56
FOR EACH ROW EXECUTE PROCEDURE deactivate_semester_enrolments_update();
22
58
CREATE TABLE offering (
23
59
offeringid SERIAL PRIMARY KEY NOT NULL,
24
subj_name VARCHAR NOT NULL,
25
subj_code VARCHAR NOT NULL,
26
year CHAR(4) NOT NULL,
27
semester CHAR(1) NOT NULL,
60
subject INT4 REFERENCES subject (subjectid) NOT NULL,
61
semesterid INTEGER REFERENCES semester (semesterid) NOT NULL,
62
groups_student_permissions VARCHAR NOT NULL DEFAULT 'none',
63
CHECK (groups_student_permissions in ('none', 'invite', 'create')),
64
UNIQUE (subject, semesterid)
67
-- Projects and groups
68
-- -------------------
70
CREATE TABLE project_set (
71
projectsetid SERIAL PRIMARY KEY NOT NULL,
72
offeringid INTEGER REFERENCES offering (offeringid) NOT NULL,
73
max_students_per_group INTEGER NOT NULL DEFAULT 4
31
76
CREATE TABLE project (
32
77
projectid SERIAL PRIMARY KEY NOT NULL,
35
offeringid INT4 REFERENCES offering (offeringid) NOT NULL,
80
projectsetid INTEGER REFERENCES project_set (projectsetid) NOT NULL,
39
84
CREATE TABLE project_group (
40
85
groupnm VARCHAR NOT NULL,
41
86
groupid SERIAL PRIMARY KEY NOT NULL,
42
offeringid INT4 REFERENCES offering (offeringid),
87
projectsetid INTEGER REFERENCES project_set (projectsetid) NOT NULL,
44
89
createdby INT4 REFERENCES login (loginid) NOT NULL,
45
90
epoch TIMESTAMP NOT NULL,
46
UNIQUE (offeringid, groupnm)
91
UNIQUE (projectsetid, groupnm)
94
CREATE OR REPLACE FUNCTION check_group_namespacing_insertupdate()
99
SELECT offeringid INTO oid FROM project_set WHERE project_set.projectsetid = NEW.projectsetid;
100
PERFORM 1 FROM project_group, project_set WHERE project_set.offeringid = oid AND project_group.projectsetid = project_set.projectsetid AND project_group.groupnm = NEW.groupnm;
102
RAISE EXCEPTION ''a project group named % already exists in offering ID %'', NEW.groupnm, oid;
106
' LANGUAGE 'plpgsql';
108
CREATE TRIGGER check_group_namespacing
109
BEFORE INSERT OR UPDATE ON project_group
110
FOR EACH ROW EXECUTE PROCEDURE check_group_namespacing_insertupdate();
49
112
CREATE TABLE group_invitation (
50
113
loginid INT4 REFERENCES login (loginid) NOT NULL,
51
114
groupid INT4 REFERENCES project_group (groupid) NOT NULL,
72
133
special_supp_result VARCHAR,
135
active BOOL NOT NULL DEFAULT true,
74
136
PRIMARY KEY (loginid,offeringid)
139
CREATE OR REPLACE FUNCTION confirm_active_semester_insertupdate()
144
SELECT semester.active INTO active FROM offering, semester WHERE offeringid=NEW.offeringid AND semester.semesterid = offering.semesterid;
145
IF NOT active AND NEW.active = true THEN
146
RAISE EXCEPTION ''cannot have active enrolment for % in offering %, as the semester is inactive'', NEW.loginid, NEW.offeringid;
150
' LANGUAGE 'plpgsql';
152
CREATE TRIGGER confirm_active_semester
153
BEFORE INSERT OR UPDATE ON enrolment
154
FOR EACH ROW EXECUTE PROCEDURE confirm_active_semester_insertupdate();
77
156
CREATE TABLE assessed (
78
157
assessedid SERIAL PRIMARY KEY NOT NULL,
79
158
loginid INT4 REFERENCES login (loginid),
80
159
groupid INT4 REFERENCES project_group (groupid),
160
projectid INT4 REFERENCES project (projectid) NOT NULL,
81
161
-- exactly one of loginid and groupid must be non-null
82
162
CHECK ((loginid IS NOT NULL AND groupid IS NULL)
83
163
OR (loginid IS NULL AND groupid IS NOT NULL))
112
192
CREATE TABLE problem (
113
193
problemid SERIAL PRIMARY KEY NOT NULL,
114
194
identifier VARCHAR UNIQUE NOT NULL,
198
CREATE TABLE worksheet (
199
worksheetid SERIAL PRIMARY KEY NOT NULL,
200
subject VARCHAR NOT NULL,
201
identifier VARCHAR NOT NULL,
204
UNIQUE (subject, identifier)
207
CREATE TABLE worksheet_problem (
208
worksheetid INT4 REFERENCES worksheet (worksheetid) NOT NULL,
209
problemid INT4 REFERENCES problem (problemid) NOT NULL,
211
PRIMARY KEY (worksheetid, problemid)
118
214
CREATE TABLE problem_tag (
119
215
problemid INT4 REFERENCES problem (problemid),
120
216
tag VARCHAR NOT NULL,