Create initial database schema with tables and views

schema/schema.sql

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+COMMENT ON SCHEMA "public" IS 'standard public schema';
+
+CREATE TABLE "public"."fakeTable" (
+    "idd" serial,
+    "name" VARCHAR(16)
+);
+
+CREATE TABLE "public"."audit" (
+    "id" serial,
+    "operation" text NOT NULL,
+    "query" text,
+    "user_name" text NOT NULL,
+    "changed_at" timestamp(6) with time zone DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT "audit_pkey" PRIMARY KEY (id)
+);
+
+CREATE INDEX "idx_audit_changed_at" ON ONLY "public"."audit" (changed_at);
+
+CREATE INDEX "idx_audit_operation" ON ONLY "public"."audit" (operation);
+
+CREATE INDEX "idx_audit_username" ON ONLY "public"."audit" (user_name);
+
+CREATE TABLE "public"."department" (
+    "dept_no" text NOT NULL,
+    "dept_name" text NOT NULL,
+    CONSTRAINT "department_pkey" PRIMARY KEY (dept_no),
+    CONSTRAINT "department_dept_name_key" UNIQUE (dept_name)
+);
+
+CREATE TABLE "public"."dept_emp" (
+    "emp_no" integer NOT NULL,
+    "dept_no" text NOT NULL,
+    "from_date" date NOT NULL,
+    "to_date" date NOT NULL,
+    CONSTRAINT "dept_emp_pkey" PRIMARY KEY (emp_no, dept_no),
+    CONSTRAINT "dept_emp_dept_no_fkey" FOREIGN KEY ("dept_no") REFERENCES "public"."department" ("dept_no") ON DELETE CASCADE,
+    CONSTRAINT "dept_emp_emp_no_fkey" FOREIGN KEY ("emp_no") REFERENCES "public"."employee" ("emp_no") ON DELETE CASCADE
+);
+
+CREATE TABLE "public"."dept_manager" (
+    "emp_no" integer NOT NULL,
+    "dept_no" text NOT NULL,
+    "from_date" date NOT NULL,
+    "to_date" date NOT NULL,
+    CONSTRAINT "dept_manager_pkey" PRIMARY KEY (emp_no, dept_no),
+    CONSTRAINT "dept_manager_dept_no_fkey" FOREIGN KEY ("dept_no") REFERENCES "public"."department" ("dept_no") ON DELETE CASCADE,
+    CONSTRAINT "dept_manager_emp_no_fkey" FOREIGN KEY ("emp_no") REFERENCES "public"."employee" ("emp_no") ON DELETE CASCADE
+);
+
+CREATE TABLE "public"."employee" (
+    "emp_no" serial,
+    "birth_date" date NOT NULL,
+    "first_name" text NOT NULL,
+    "last_name" text NOT NULL,
+    "gender" text NOT NULL,
+    "hire_date" date NOT NULL,
+    CONSTRAINT "employee_pkey" PRIMARY KEY (emp_no),
+    CONSTRAINT "employee_gender_check" CHECK (gender = ANY (ARRAY['M'::text, 'F'::text]))
+);
+
+CREATE INDEX "idx_employee_hire_date" ON ONLY "public"."employee" (hire_date);
+
+CREATE TABLE "public"."salary" (
+    "emp_no" integer NOT NULL,
+    "amount" integer NOT NULL,
+    "from_date" date NOT NULL,
+    "to_date" date NOT NULL,
+    CONSTRAINT "salary_pkey" PRIMARY KEY (emp_no, from_date),
+    CONSTRAINT "salary_emp_no_fkey" FOREIGN KEY ("emp_no") REFERENCES "public"."employee" ("emp_no") ON DELETE CASCADE
+);
+
+CREATE INDEX "idx_salary_amount" ON ONLY "public"."salary" (amount);
+
+CREATE TABLE "public"."t0" (
+    "id" serial,
+    "username" text NOT NULL,
+    CONSTRAINT "t0_pkey" PRIMARY KEY (id)
+);
+
+CREATE TABLE "public"."title" (
+    "emp_no" integer NOT NULL,
+    "title" text NOT NULL,
+    "from_date" date NOT NULL,
+    "to_date" date,
+    CONSTRAINT "title_pkey" PRIMARY KEY (emp_no, title, from_date),
+    CONSTRAINT "title_emp_no_fkey" FOREIGN KEY ("emp_no") REFERENCES "public"."employee" ("emp_no") ON DELETE CASCADE
+);
+
+CREATE VIEW "public"."current_dept_emp" AS SELECT l.emp_no,
+    d.dept_no,
+    l.from_date,
+    l.to_date
+   FROM (public.dept_emp d
+     JOIN public.dept_emp_latest_date l ON (((d.emp_no = l.emp_no) AND (d.from_date = l.from_date) AND (l.to_date = d.to_date))));
+
+CREATE VIEW "public"."dept_emp_latest_date" AS SELECT emp_no,
+    max(from_date) AS from_date,
+    max(to_date) AS to_date
+   FROM public.dept_emp
+  GROUP BY emp_no;
+
+CREATE OR REPLACE FUNCTION public.log_dml_operations()
+ RETURNS trigger
+ LANGUAGE plpgsql
+AS $function$
+BEGIN
+    IF (TG_OP = 'INSERT') THEN
+        INSERT INTO audit (operation, query, user_name)
+        VALUES ('INSERT', current_query(), current_user);
+        RETURN NEW;
+    ELSIF (TG_OP = 'UPDATE') THEN
+        INSERT INTO audit (operation, query, user_name)
+        VALUES ('UPDATE', current_query(), current_user);
+        RETURN NEW;
+    ELSIF (TG_OP = 'DELETE') THEN
+        INSERT INTO audit (operation, query, user_name)
+        VALUES ('DELETE', current_query(), current_user);
+        RETURN OLD;
+    END IF;
+    RETURN NULL;
+END;
+$function$;
+