题目内容

为什么要学习CSS

A. 内容和表现分离
B. 让网页更好的进行交互
C. 可以实现动态效果
D. 流水线作业

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A. WHERE
B. FROM
C. VALUES
D. SET

A. DELETE FROM book WHERE 单价>20
B. DELETE * FROM book
C. DELETE FROM book HAVING 单价>20
DELETE FROM book

A. SELECT，INTO
B. SELECT，FROM
C. SELECT，GROUP
D. 仅SELECT

A. DISTINCT
B. UNION
C. ALL
D. TOP