Added Database

Database/db.sql

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+SELECT * FROM pg_catalog.pg_tables
+	WHERE schemaname != 'pg_catalog' AND 	-- To show all tables
+    schemaname != 'information_schema';
+SELECT 
+table_name, 
+column_name as "Columns", 
+data_type as "DataTypes"
+ FROM 							-- describe tables
+ information_schema.columns
+ where "table_schema"='public'
+  order by table_name,column_name
+  ;
+
+select kcu.table_schema,
+       kcu.table_name,
+       tco.constraint_name,
+       kcu.ordinal_position as position,
+       kcu.column_name as key_column
+from information_schema.table_constraints tco
+join information_schema.key_column_usage kcu 
+     on kcu.constraint_name = tco.constraint_name
+     and kcu.constraint_schema = tco.constraint_schema
+     and kcu.constraint_name = tco.constraint_name
+where tco.constraint_type = 'PRIMARY KEY'
+order by kcu.table_schema,
+         kcu.table_name,
+         position;
+
+select tc.table_schema, tc.table_name, kc.column_name
+from information_schema.table_constraints tc
+  join information_schema.key_column_usage kc 
+    on kc.table_name = tc.table_name and kc.table_schema = tc.table_schema and kc.constraint_name = tc.constraint_name
+where tc.constraint_type = 'FOREIGN KEY'
+  and kc.ordinal_position is not null
+order by tc.table_schema,
+         tc.table_name,
+         kc.position_in_unique_constraint;
+
+CREATE TABLE school
+(
+    schoolid integer NOT NULL,
+    schoolname character varying(30) COLLATE pg_catalog."default",
+    city character varying(30) COLLATE pg_catalog."default",
+    state character varying(30) COLLATE pg_catalog."default",
+    pincode integer,
+    CONSTRAINT school_pkey PRIMARY KEY (schoolid)
+);
+select * from school;
+
+CREATE TABLE centers
+(
+    centerid integer NOT NULL,
+    schoolid integer NOT NULL,
+	capacity bigint,
+    CONSTRAINT centers_pkey PRIMARY KEY (centerid),
+    CONSTRAINT centers_schoolid_fkey FOREIGN KEY (schoolid)
+        REFERENCES school (schoolid) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION
+);
+select * from centers;
+insert into centers values(3,3,256),(4,4,256),(5,5,256);
+CREATE TABLE exam
+(
+    examid integer NOT NULL,
+    date date,
+    "time" time without time zone,
+    subjectid integer,
+    exam_type character varying(10) COLLATE pg_catalog."default",
+    CONSTRAINT exam_pkey PRIMARY KEY (examid)
+);
+insert into exam values(1,'2022-05-22','04:05:06.789',1,'written');
+select * from exam;
+CREATE TABLE conducts
+(
+    centerid integer,
+    examid integer,
+    CONSTRAINT conducts_centerid_fkey FOREIGN KEY (centerid)
+        REFERENCES centers (centerid) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION,
+    CONSTRAINT conducts_examid_fkey FOREIGN KEY (examid)
+        REFERENCES exam (examid) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION
+);
+
+select * from conducts;
+drop table examinar;
+CREATE TABLE examinar
+(
+    e_id integer NOT NULL,
+    fname character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    --mname character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    lname character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    phone character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    email character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    qualification character varying(550) COLLATE pg_catalog."default" NOT NULL,
+    gender character varying(35) COLLATE pg_catalog."default" NOT NULL,
+    stream integer NOT NULL,
+    ischecker boolean NOT NULL,
+    issupervisor boolean NOT NULL,
+    issetter boolean NOT NULL,
+    center integer,
+    examid integer,
+	state varchar(30),
+	city varchar(30),
+	username varchar(50),
+	password varchar(50),
+    CONSTRAINT examinar_pkey PRIMARY KEY (e_id),
+    CONSTRAINT examinar_center_fkey FOREIGN KEY (center)
+        REFERENCES centers (centerid) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION,
+    CONSTRAINT examinar_examid_fkey FOREIGN KEY (examid)
+        REFERENCES exam (examid) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION
+);
+select * from examinar;
+CREATE TABLE marks
+(
+	enrollno int,
+	name varchar(50),
+	stream varchar(30),
+	physics int,
+	chemistry int,
+	maths int,
+	english int,
+	biology int,
+	cs int,
+	business int,
+	geography int,
+	history int
+);
+select * from marks;
+delete from marks where name ='Nithin';
+CREATE TABLE stream
+(
+    sid integer NOT NULL,
+    stream_name character varying(30) COLLATE pg_catalog."default",
+    CONSTRAINT stream_pkey PRIMARY KEY (sid)
+);
+select * from stream;
+CREATE TABLE statehead
+(
+	shusername varchar(30),
+	shpassword varchar(30)
+);
+select * from statehead;
+insert into statehead values
+	('statehead1','password1'),
+	('statehead2','password2'),
+	('statehead3','password3')
+	;
+
+CREATE TABLE student
+(
+    enrollment_number integer NOT NULL,
+    firstname character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    --middlename character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    lastname character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    fathername character varying(30) COLLATE pg_catalog."default" NOT NULL,
+	mothersname character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    aadharnumber bigint NOT NULL,
+    mobilenumber bigint NOT NULL,
+    date_of_birth date NOT NULL,
+    city character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    state character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    --pincode integer NOT NULL,
+    gender character varying(1) COLLATE pg_catalog."default" NOT NULL,
+    --physical_handicap boolean NOT NULL,
+    email character varying(30) COLLATE pg_catalog."default" NOT NULL,
+	username character varying(30) COLLATE pg_catalog."default" NOT NULL,
+	password character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    center integer NOT NULL,
+    stream integer NOT NULL,
+    school integer NOT NULL,
+    CONSTRAINT student_pkey PRIMARY KEY (enrollment_number),
+    CONSTRAINT student_center_fkey FOREIGN KEY (center)
+        REFERENCES centers (centerid) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION,
+    CONSTRAINT student_school_fkey FOREIGN KEY (school)
+        REFERENCES school (schoolid) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION,
+    CONSTRAINT student_stream_fkey FOREIGN KEY (stream)
+        REFERENCES stream (sid) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION
+);
+select * from student;
+
+CREATE TABLE gives
+(
+    student integer,
+    exam integer,
+    CONSTRAINT gives_exam_fkey FOREIGN KEY (exam)
+        REFERENCES exam (examid) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION,
+    CONSTRAINT gives_student_fkey FOREIGN KEY (student)
+        REFERENCES student (enrollment_number) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION
+);
+
+CREATE TABLE result
+(
+    result_id integer NOT NULL,
+    studentid integer NOT NULL,
+    persentage integer,
+    is_pass boolean NOT NULL,
+    CONSTRAINT result_pkey PRIMARY KEY (result_id),
+    CONSTRAINT result_studentid_fkey FOREIGN KEY (studentid)
+        REFERENCES student (enrollment_number) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION
+);
+
+
+
+CREATE TABLE school_representative
+(
+    srid integer,
+    schoolid integer NOT NULL,
+    address character varying(50) COLLATE pg_catalog."default",
+    phone integer,
+    email character varying(50) COLLATE pg_catalog."default",
+    pincode integer,
+    fname character varying(30) COLLATE pg_catalog."default",
+    mname character varying(30) COLLATE pg_catalog."default",
+    lname character varying(30) COLLATE pg_catalog."default",
+    CONSTRAINT school_representative_schoolid_key UNIQUE (schoolid)
+,
+    CONSTRAINT school_representative_schoolid_fkey FOREIGN KEY (schoolid)
+        REFERENCES school (schoolid) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION
+);
+
+CREATE TABLE subject
+(
+    subjectid integer NOT NULL,
+    subject_name character varying(30) COLLATE pg_catalog."default",
+    streamid integer,
+    CONSTRAINT subject_pkey PRIMARY KEY (subjectid),
+    CONSTRAINT subject_streamid_fkey FOREIGN KEY (streamid)
+        REFERENCES stream (sid) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION
+);
+--------------------------------------------------
+
+select firstname, lastname, username, password from student;
+select fname, lname, username, password from examinar;
+select * from statehead;
+select * from marks;
+select * from school;