1AND运算符
SELECT *
FROM stu_info
WHERE depart='数学'
AND sex='女'
ORDER BY sno
SELECT *
FROM stu_info
WHERE 出生日期>='01/01/1975'
AND 出生日期<'01/01/1976'
AND email IS NULL
ORDER BY出生日期
2、 OR运算符;
SELECT *
FROM stru_info
WHERE depart='中文系'
OR depart='外语系'
ORDER BY sno
3、 AND与OR的优先顺序问题;
SELECT *
FROM stu_info
WHERE (depart='中文系' OR depart='外语系')
AND sex='女'
ORDER BY sno
4、 NOT运算符;
SELECT *
FROM stu_info
WHERE birth NOT BETWEEN '01/01/1978' AND '12/31/1980'
5、 IN运算符;
SELECT *
FROM course
WHERE credit IN (2, 3, 4)
ORDER BY credit DESC,cno
SELECT *
FROM stu_info
WHERE depart NOT IN ('中文系','外语系','计算机系')
ORDER BY depart DESC
6、 LIKE运算符与“%"通配符;
SELECT *
FROM strLinfo
WHERE sname LIKE '%三% '
7、 “_”通配符的使用;
SELECT *
FROM stu_info
WHERE RTRIM(sname) LIKE '刘_'
SELECT *
FROM strLinfo
WHERE RTRIM (sname) LIKE '__'
8、 “[]”通配符的使用;
查询姓张、李或刘的所有学生,并按姓名升序排序.
SELECT *
FROM stu_infD
WHERE sname LIKE '[张李刘]%'
ORDER BY sname
查询除姓张、李或刘以外的所有学生。并按姓名升序排序.
SELECT *
FROM stu_info
WHERE sname LIKE '[^张李刘]%'
ORDER BY sname
9、 定义转义字符;
前面学习了几种通配符的使用方法,知道了“%5%”代表包含5的所有字符串,但如果想要查询最后两个字符为百分之五的所有字符串呢?即将“%5%组中,.第二个“%"视为是普通字符,而不是通配符,此时,便应该定义和使用转义字符。在SQL Server中,使用ESCAPE关键字定义转义字符。例如,要查询最后两个字符为百分之五(5%)的所有字符串,其LIKE
语句为:
LIKE ’%5#%‘ ESCAPE ’#‘