Добавил SQL примеры в проект

sql/cascade-update.sql

@@ -0,0 +1,14 @@
+CREATE TABLE status
+(
+    id    BIGINT NOT NULL PRIMARY KEY,
+    title VARCHAR(30) NOT NULL UNIQUE
+);
+
+CREATE TABLE post
+(
+    id     BIGINT NOT NULL PRIMARY KEY,
+    title  VARCHAR(60),
+    status VARCHAR(30) NOT NULL
+        CONSTRAINT fk_post_status_status_title
+            REFERENCES status(title) ON UPDATE CASCADE
+);

sql/create-many-to-one.sql

@@ -0,0 +1,41 @@
+CREATE TABLE tutorials
+(
+    id          BIGINT NOT NULL PRIMARY KEY,
+    description VARCHAR(255),
+    published   BOOLEAN,
+    title       VARCHAR(255)
+);
+
+CREATE TABLE photos
+(
+    id          BIGINT NOT NULL PRIMARY KEY,
+    description VARCHAR(255),
+    published   BOOLEAN,
+    title       VARCHAR(255)
+);
+
+CREATE TABLE comments
+(
+    id      BIGINT NOT NULL PRIMARY KEY,
+    content TEXT
+);
+
+CREATE TABLE tutorial_comments
+(
+    tutorial_id BIGINT NOT NULL
+        CONSTRAINT fk_tutorial_comments_tutorial_id
+            REFERENCES tutorials,
+    comment_id  BIGINT NOT NULL
+        CONSTRAINT fk_tutorial_comments_comment_id
+            REFERENCES comments
+);
+
+CREATE TABLE photos_comments
+(
+    photo_id   BIGINT NOT NULL
+        CONSTRAINT fk_photos_comments_photo_id
+            REFERENCES photos,
+    comment_id BIGINT NOT NULL
+        CONSTRAINT fk_photos_comments_comment_id
+            REFERENCES comments
+)

sql/create-one-to-many.sql

@@ -0,0 +1,19 @@
+CREATE TABLE tutorials
+(
+    id          BIGINT NOT NULL PRIMARY KEY,
+    description VARCHAR(255),
+    published   BOOLEAN,
+    title       VARCHAR(255)
+);
+
+CREATE TABLE comments
+(
+    id          BIGINT NOT NULL PRIMARY KEY,
+    content     TEXT,
+    tutorial_id BIGINT NOT NULL
+        CONSTRAINT fk_comments_tutorial_id
+            REFERENCES tutorials
+
+);
+
+CREATE INDEX fk_comments_index ON comments (tutorial_id);