MYSQL查詢練習 1

-- 查詢練習 1------------

CREATE TABLE stu (
sid CHAR(6),
sname VARCHAR(50),
age INT,
gender VARCHAR(50)
);

INSERT INTO stu VALUES('S_1001', 'liuYi', 35, 'male');
INSERT INTO stu VALUES('S_1002', 'chenEr', 15, 'female');
INSERT INTO stu VALUES('S_1003', 'zhangSan', 95, 'male');
INSERT INTO stu VALUES('S_1004', 'liSi', 65, 'female');
INSERT INTO stu VALUES('S_1005', 'wangWu', 55, 'male');
INSERT INTO stu VALUES('S_1006', 'zhaoLiu', 75, 'female');
INSERT INTO stu VALUES('S_1007', 'sunQi', 25, 'male');
INSERT INTO stu VALUES('S_1008', 'zhouBa', 45, 'female');
INSERT INTO stu VALUES('S_1009', 'wuJiu', 85, 'male');
INSERT INTO stu VALUES('S_1010', 'zhengShi', 5, 'female');
INSERT INTO stu VALUES('S_1011', 'xxx', NULL, NULL);

 

----------查詢性別爲女，而且年齡大於等於50的記錄----------

SELECT * FROM stu WHERE gender='female' AND age>=50

----------查詢學號爲S_1001，或者姓名爲liSi的記錄----------

SELECT * FROM stu WHERE sid='S_1001' OR sname='liSi'

-- 　查詢學號爲S_1001，S_1002，S_1003的記錄

SELECT * FROM stu WHERE sid='S_1001' OR sid='S_1002' OR sid='S_1003'

-- 　查詢學號不是S_1001，S_1002，S_1003的記錄

SELECT * FROM stu WHERE NOT (sid='S_1001' OR sid='S_1002' OR sid='S_1003')

-- 　查詢年齡爲null的記錄

SELECT * FROM stu WHERE age IS NULL

-- 　查詢年齡在20到40之間的學生記錄

SELECT * FROM stu WHERE age BETWEEN 20 AND 40

-- 　查詢性別非男的學生記錄

SELECT * FROM stu WHERE gend er!='male'

-- 　查詢姓名不爲null的學生記錄

SELECT * FROM stu WHERE NOT sname IS NULL

-- 　查詢姓名由5個字母構成的學生記錄

SELECT * FROM stu WHERE sname LIKE '_____'

-- 　查詢姓名由5個字母構成，而且第5個字母爲「i」的學生記錄

SELECT * FROM stu WHERE sname LIKE '____i'

-- 　查詢姓名以「z」開頭的學生記錄

SELECT * FROM stu WHERE sname LIKE 'z%'

-- 　查詢姓名中第2個字母爲「i」的學生記錄

SELECT * FROM stu WHERE sname LIKE '_i%'

-- 　查詢姓名中包含「a」字母的學生記錄

SELECT * FROM stu WHERE sname LIKE '%a%'