问题
单项选择题
在SQL的查询语句中，对应关系代数中“投影”运算的语句是（）。
A.WHERE
B.SELECT
C.HAVTNG
D.FROM
答案
参考答案：B
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在SQL的查询语句中，对应关系代数中“投影”运算的语句是（）。
A.WHERE
B.SELECT
C.HAVTNG
D.FROM
参考答案：B
| 句子配对。 | |
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