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SELECT 专业 AS SUBS(学号,3,2),平均分 AS AVG(成绩) FROM 选课 WHERE 课程号="101" GROUP BY 专业 SELECT SUBS(学号,3,2) AS 专业,AVG(成绩) AS 平均分 FRON 选课 WHERE 课程号="101" GROUP BY 1 SELECT SUBS(学号,3,2) AS 专业,AVG(成绩) AS 平均分 FRON 选课 WHERE 课程号="101" ORDER BY 专业 SELECT 专业 AS SUBS(学号,3,2),平均分 AS AVG(成绩) FRON 选课 WHERE 课程号="101" ORDER BY 1
分数 1/3 可读作: one third 分数 2/3 可读作: two thirds 小数 0.125 可读作: nought point one two five 百分数 25%可读作: twenty-five percent 时间 9: 45 可读作: nine forty-five
SELECT 学生.学号,姓名 FROM 学生,选课 WHERE 学生.学号=选课.学号AND 课程号="101" AND 成绩>=ALL(SELECT 成绩 FROM 选课) SELECT 学生.学号,姓名 FROM 学生,选课 WHERE 学生.学号=选课.学号AND 成绩>=ALL(SELECT 成绩 FRON 选课 WHERE 课程号="101") SELECT 学生.学号,姓名 FROM 学生,选课 WHERE 学生.学号=选课.学号AND 成绩>=ANY(SELECT 成绩 FRON 选课 WHERE 课程号="101") SELECT 学生.学号,姓名 FROM 学生,选课 WHERE 学生.学号=选课.学号 AND 课程号="101" AND 成绩>=(SELECT 成绩 FROM 选课 WHERE 课程号="101")
five to three five past two two five five to two
SELECT AVG(成绩) FROM 选课 WHERE 姓名="刘明" SELECT AVG(成绩) FROM 学生,选课 WHERE 姓名="刘明" SELECT AVG(成绩) FROM 学生,选课 WHERE 学生.姓名="刘明" SELECT ATG(成绩) FRON 学生,选课 WHERE 学生.学号=选课.学号 AND 姓名="刘明/
INSERT TO XS FROM ARRAY A INSERT INT0 XS FRON ARRAY A INSERT TO XS FROM A INSERT INTO XS FROM
two of them and two of whom of which two two of whom