题目内容

设置惟一约束的列可以为空。

A. 对
B. 错

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MySQL语句在书写时不区分大小写

A. 对
B. 错

主键约束是非空约束和唯一约束的组合

A. 对
B. 错

Conversation 1[音频]

A. She used to take long walks in the hills.
B. She got very tired from walking her dog.
C. She worked very hard in the woods last week.
D. She once wore high-heeled shoes during a long walk.

Conversation 2[音频]

Add more sweets to Coke at the party.
B. Have a barbecue party in the backyard.
C. Add flavor to the barbecue sauce with Coke.
D. Prepare more Coke for the barbecue party.

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