/*插入部分字段*/
INSERT INTO student(uid,PASSWORD,money) VALUES(2,'123456',1000)
/*插入所有字段*/
INSERT INTO student VALUES (2,'熊大','123','2019-05-05',1200)
/*修改指定字段的值*/
UPDATE student SET uname='熊二' WHERE uid=2
UPDATE student SET birth='2019-11-29' WHERE uid=2
/*带条件的删除*/
DELETE FROM student WHERE uid=2
/*不带条件的删除*/
DELETE FROM student
/*全表删除*/
TRUNCATE TABLE student;
/*查询指定字段的值*/
SELECT uname,PASSWORD FROM student
/*查询时添加常量列*/
SELECT uname AS n,PASSWORD AS p FROM student
/*查询表中所有数据*/
SELECT * FROM student
/*查询时合并列*/
SELECT sname,(html+js+jquery)/3 AS savg FROM score
/*查询时保留小数位数*/
SELECT sname, FORMAT(html,2) FROM score
/*查询jquery成绩合格的所有女同学信息*/
SELECT * FROM score WHERE jquery>=60 AND sex='女'
/*查询所有html不合格的男同学姓名*/
SELECT sname FROM score WHERE html<60 AND sex='男'