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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
DELETE i1
FROM inboxes i1
JOIN inboxes i2
ON i1.user_id = i2.user_id
AND i1.article_id = i2.article_id
AND i1.id > i2.id;
Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
ALTER TABLE inboxes
ADD CONSTRAINT uq_inboxes_user_article
UNIQUE (user_id, article_id);