mysql数据库搜索实例

标签：esc   mysql   ima   tin   varchar   desc   ble   des   hda   

MySQL 数据库搜索实例练习（基础练习）：

先再MySQL数据库中建两个表，实例如下：

CREATE TABLE student(
    stuNo CHAR(8) PRIMARY KEY,
    stuName VARCHAR(50) NOT NULL,
    stuage TINYINT NOT NULL,
    stuSex TINYINT,
    birthday DATETIME
);


INSERT INTO student VALUES(‘10011011‘,‘张三‘,19,1,‘1997-1-1 1:1:1‘);
INSERT INTO student VALUES(‘10011012‘,‘张小亮‘,20,0,‘1996-1-1 1:1:1‘);
INSERT INTO student VALUES(‘10011013‘,‘李四‘,16,0,‘1999-1-1 1:1:1‘);
INSERT INTO student VALUES(‘10011014‘,‘小李四‘,18,1,‘1998-1-1 1:1:1‘);
INSERT INTO student VALUES(‘10011015‘,‘小强‘,21,1,‘1994-1-1 1:1:1‘);
INSERT INTO student VALUES(‘10011016‘,‘赵玉‘,22,1,NULL);
INSERT INTO student VALUES(‘10011017‘,‘王五‘,25,1,‘1991-1-1 1:1:1‘);
INSERT INTO student VALUES(‘10011018‘,‘小六‘,17,0,‘2000-1-1 1:1:1‘);

CREATE TABLE stuscore(
    scoreNo CHAR(6) PRIMARY KEY,
    stuNo CHAR(8) NOT NULL,
    javaScore TINYINT NOT NULL,
    htmlScore TINYINT NOT NULL
);


INSERT INTO stuscore VALUES(‘200101‘,‘10011011‘,73,84);
INSERT INTO stuscore VALUES(‘200102‘,‘10011012‘,77,69);
INSERT INTO stuscore VALUES(‘200103‘,‘10011013‘,89,92);
INSERT INTO stuscore VALUES(‘200104‘,‘10011014‘,62,84);
INSERT INTO stuscore VALUES(‘200105‘,‘10011015‘,41,31);
INSERT INTO stuscore VALUES(‘200106‘,‘10011016‘,37,50);
INSERT INTO stuscore VALUES(‘200107‘,‘10011017‘,90,88);
INSERT INTO stuscore VALUES(‘200108‘,‘10011018‘,85,72);

（##数值时随意添加的）

搜索实例如下：

-- 查询所有学员信息
SELECT * FROM student;
-- 查询stuno为10011012的学生姓名
SELECT  stuname FROM  student WHERE stuno=‘10011012‘;
-- 查询stuno为10011014和10011016的学生信息
SELECT * FROM  student WHERE stuno=‘10011012‘ OR stuno=‘10011016‘;
-- 查询所有年龄在20岁以上的学生编号
SELECT stuno FROM student WHERE stuage>20;
-- 查询所有生日为空的学生信息
SELECT * FROM student WHERE birthday IS NULL;
-- 查询所有姓小的学生信息
SELECT * FROM student WHERE stuname LIKE‘小%‘;
-- 查询所有姓名中第二个字是小的学生信息
SELECT * FROM student WHERE stuname LIKE ‘_小%‘;
-- 查询所有姓名中带小的学员信息
SELECT * FROM student WHERE stuname LIKE ‘%小%‘
-- 查询所有姓小的名字为2个字的学生信息
SELECT * FROM student WHERE stuname LIKE ‘小_‘;
-- 查询所有学生姓名及年龄并按年龄升降序排列
SELECT stuname,stuage FROM student WHERE stuage ORDER BY stuage;
SELECT stuname,stuage FROM student WHERE stuage ORDER BY stuage DESC;
-- 查询所有姓小的学生信息按年龄降序排列
SELECT * FROM student WHERE stuname LIKE ‘小%‘ ORDER BY stuage;
-- 查找java成绩最高的学生编号
SELECT  stuNo FROM stuscore WHERE javaScore=(SELECT MAX(javaScore)FROM stuscore);
-- 查询所有html成绩在平均分以上的学生编号
SELECT  stuNo FROM stuscore WHERE htmlScore>(SELECT AVG(htmlScore)FROM stuscore);
-- 查询所有学生姓名、两科成绩
SELECT a.stuname,b.javaScore,b.htmlScore
FROM student a,stuscore b
WHERE a.stuNo=b.stuNo;
-- 查询java成绩最高的学生信息
SELECT * FROM student a,stuscore b
WHERE javaScore=(SELECT (MAX(javaScore)) FROM  stuscore)
AND a.`stuNo`=b.`stuNo`;
-- 查询所有java成绩大于html成绩的学生姓名
SELECT stuname FROM student a,stuscore b
WHERE b.`javaScore`>b.`htmlScore`
AND a.`stuNo`=b.`stuNo`;
-- 查询所有姓小的学生的姓名以及两科成绩并按年龄降序排列
SELECT a.stuname,b.javascore,b.htmlscore
FROM student a,stuscore b
WHERE a.`stuNo` = b.`stuNo

mysql数据库搜索实例

标签：esc   mysql   ima   tin   varchar   desc   ble   des   hda   

原文地址：https://www.cnblogs.com/zsc1/p/9235787.html