常見(jiàn)例句When you create a table, you can add an extra column to be the surrogate key. 當(dāng)創(chuàng)建一個(gè)表時(shí),可以添加一個(gè)額外的列作為代理鍵。Add an extra column following each rating to calculate your average grades for entries, exits, and completed trades. 在每個(gè)分?jǐn)?shù)后面再加一列，計(jì)算你的平均進(jìn)場(chǎng)得分，離場(chǎng)得分和總計(jì)得分。She angled her column of chitchat toward teenagers. 她的漫談欄側(cè)重于十幾歲的青少年。My extra earnings came in very handy. 我的額外收入可備我不時(shí)之需。This extra strong glue should do the job nicely. 這種超強(qiáng)度膠應(yīng)該管用。She decided to rent out a room to get extra income. 她為獲得額外收入決定租出一個(gè)房間。 返回 extra-column