correction sql

sql/createTables.sql

@@ -15,32 +15,46 @@ CREATE TABLE msg (
     threadID int,
     msg text,
     posted_at DATE,
-    CONSTRAINT fk_message FOREIGN KEY (userID_msg) REFERENCES userAccount(userID),
+    CONSTRAINT fk_message FOREIGN KEY (userID_msg) REFERENCES userAccount(userID)
+        ON DELETE CASCADE,
     CONSTRAINT pk_message PRIMARY KEY (msgID)
+
 );
 
 CREATE TABLE thread (
     threadID SERIAL,
     userID_thread int, 
     threadName VARCHAR(50),
-    CONSTRAINT fk_thread FOREIGN KEY (userID_thread) REFERENCES userAccount(userID),
-    CONSTRAINT pk_thread PRIMARY KEY (threadID) 
+    CONSTRAINT fk_thread FOREIGN KEY (userID_thread) REFERENCES userAccount(userID)
+    ON DELETE CASCADE,
+    CONSTRAINT pk_thread PRIMARY KEY (threadID)
+
 );
 
 CREATE TABLE reactions (
     userID_reactions int,
     msgID_reactions int,
     reaction boolean,
-    CONSTRAINT fk_reactions_user FOREIGN KEY (userID_reactions) REFERENCES userAccount(userID),
-    CONSTRAINT fk_reactions_message FOREIGN KEY (msgID_reactions) REFERENCES msg(msgID),
+    CONSTRAINT fk_reactions_user FOREIGN KEY (userID_reactions) REFERENCES userAccount(userID)
+    ON DELETE CASCADE
+    ,
+    CONSTRAINT fk_reactions_message FOREIGN KEY (msgID_reactions) REFERENCES msg(msgID)
+    ON DELETE CASCADE
+    ,
     CONSTRAINT pk_reactions PRIMARY KEY (userID_reactions, msgID_reactions)
+
 );
 
 CREATE TABLE follow (
     userID_follow int,
     threadID_follow int,
     followDate date,
-    CONSTRAINT fk_follow_user FOREIGN KEY (userID_follow) REFERENCES userAccount(userID),
-    CONSTRAINT fk_follow_thread FOREIGN KEY (threadID_follow) REFERENCES thread(threadID),
+    CONSTRAINT fk_follow_user FOREIGN KEY (userID_follow) REFERENCES userAccount(userID)
+    ON DELETE CASCADE
+    ,
+    CONSTRAINT fk_follow_thread FOREIGN KEY (threadID_follow) REFERENCES thread(threadID)
+    ON DELETE CASCADE
+    ,
     CONSTRAINT pk_follow PRIMARY KEY (userID_follow, threadID_follow)
+
 );
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