问题
填空题
在设计查询时，字段的排列顺序非常重要，它影响数据的_________和_________。
答案
参考答案：排序 分组
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在设计查询时，字段的排列顺序非常重要，它影响数据的_________和_________。
参考答案：排序 分组
My friends and I had just finished lunch at a hotel when it started to rain heavily. When it became lighter, I decided to get my , which was parked at my office three streets away. My friends that I shouldn’t go, mainly because I was seven months pregnant(怀孕) then. I promised them that I’d be very . One of them wanted to come with me but I asked her to stay with another friend who needed help her baby. I walked out of the hotel and started making my way to the car. At the crossing, a van stopped and a man came out with an umbrella. Before I knew what was happening, he walked right me and told me he’d escort(护送)me. Although I refused, he said that he would. During our walk, he kept telling me to walk slower, as the ground was . When we got to the car park, I thanked him and he went away. I did not get his name and can recognize(认出) him now. Did he stop for me? I’ll never know. So how did I pay it forward? I was at home when I noticed two Indian workers in the heavy rain. They were probably on their way to the working place near my home. I went out and passed them my . I told them they should take and keep it. They were surprised by my action. They were very grateful to me, probably why a stranger was offering such kindness. I was so relaxed and happy that day.
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