feat: add teacher schema (#5)

Author: zchpeter

schema/class_teacher.sql

@@ -0,0 +1,9 @@
+CREATE TABLE "public"."class_teacher" (
+    "class_no" integer NOT NULL,
+    "teacher_no" integer NOT NULL,
+    "from_date" date NOT NULL,
+    "to_date" date NOT NULL,
+    CONSTRAINT "class_teacher_pkey" PRIMARY KEY (class_no, teacher_no),
+    CONSTRAINT "class_teacher_class_no_fkey" FOREIGN KEY ("class_no") REFERENCES "public"."class" ("class_no") ON DELETE CASCADE,
+    CONSTRAINT "class_teacher_teacher_no_fkey" FOREIGN KEY ("teacher_no") REFERENCES "public"."teacher" ("teacher_no") ON DELETE CASCADE
+);

schema/sequences.sql

@@ -1,3 +1,5 @@
 CREATE SEQUENCE "public"."class_no_seq" AS bigint START WITH 1 INCREMENT BY 1 MINVALUE 1 MAXVALUE 9223372036854775807 NO CYCLE CACHE 1;
 
 CREATE SEQUENCE "public"."student_no_seq" AS bigint START WITH 1 INCREMENT BY 1 MINVALUE 1 MAXVALUE 9223372036854775807 NO CYCLE CACHE 1;
+
+CREATE SEQUENCE "public"."teacher_no_seq" AS bigint START WITH 1 INCREMENT BY 1 MINVALUE 1 MAXVALUE 9223372036854775807 NO CYCLE CACHE 1;

schema/teacher.sql

@@ -0,0 +1,7 @@
+CREATE TABLE "public"."teacher" (
+    "teacher_no" integer DEFAULT nextval('public.teacher_no_seq'::regclass) NOT NULL,
+    "first_name" text NOT NULL,
+    "last_name" text NOT NULL,
+    "email" text NOT NULL,
+    CONSTRAINT "teacher_pkey" PRIMARY KEY (student_no)
+);