• 请问:
• SELECT title, pub_name
• FROM titles INNER JOIN
• publishers ON titles.pub_id = publishers.pub_id• 与SELECT title, pub_name
• FROM titles ,publishers
• Where titles.pub_id = publishers.pub_id
• 在功能和效率上有什么不同?
• SELECT title, pub_name
• FROM titles INNER JOIN
• publishers ON titles.pub_id = publishers.pub_id• 与SELECT title, pub_name
• FROM titles ,publishers
• Where titles.pub_id = publishers.pub_id
• 在功能和效率上有什么不同?
解决方案 »
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