extra-column

基本解釋

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。