參考SHOW INDEX Statement
的確會給外鍵默認加一個索引。
默認創建的外鍵,子表加入引用父表某一行,那麼更新子表的外鍵列和父表的主鍵都會 被拒絕。
{"type":"doc","content":[{"type":"blockquote","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null
{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ
{"type":"doc","content":[{"type":"heading","attrs":{"align":null,"level":1}},{"type":"blockquote","content":[{"type":"pa
{"type":"doc","content":[{"type":"heading","attrs":{"align":null,"level":1}},{"type":"paragraph","attrs":{"indent":0,"nu