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1.1现有两张表: T_STU表:S_ID、S_NAME、S

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1.1现有两张表:
T_STU表:S_ID、S_NAME、S_SEX、S_BIRTHDAY 、S_AGE、S_MOENY、C_ID
(学生表:学号、姓名、性别、出生日期、入学年龄、缴费)
T_CLASS表:C_ID、C_NAME
(班级表:班级编号、班级名称)
sequence序列:seq_id;

1.1.查询入学年龄在18-20的女生或者未输入性别的,实际年龄小的要排在后面
Select * from T_STU 
Where S_AGE Between 18 and 20 And S_SEX = '女' 
OR S_SEX IS NULL
Order by S_BIRTHDAY desc
发表于 2021-06-22 17:24:12 回复(0)
select * from T_STU WHERE S_AGE BETWEEN 18 AND 20 and S_SEX=‘女’ OR S_SEX IS DULL ORDER By S_BIRTHDAY desc;
发表于 2022-04-01 22:42:18 回复(0)
SELECT * FROM T_STU 
WHERE S_AGE BETWEEN 18 AND 20 AND  S_ID IN (
SELECT S_ID FROM T_STU WHERE S_SEX='女' OR S_SEX  IS NULL)
ORDER BY S_BIRTHDAY DESC
编辑于 2021-09-24 15:12:55 回复(0)