SQLyog中创建数据表及相关方法

USE du;
/*1.创建账务表  id name  mony*/
CREATE TABLE zhangwu(id INT PRIMARY KEY AUTO_INCREMENT,
              sname VARCHAR(200),
              money DOUBLE);
/*2.插入数据*/
INSERT INTO zhangwu VALUES(1,‘吃饭支出‘,666);
INSERT INTO zhangwu VALUES(2,‘睡觉支出‘,666);
INSERT INTO zhangwu VALUES(3,‘打豆豆支出‘,666);
INSERT INTO zhangwu VALUES(4,‘吃饭支出‘,666);
INSERT INTO zhangwu VALUES(5,‘吃饭支出‘,666);
UPDATE zhangwu SET money=888 WHERE id=2;
UPDATE zhangwu SET money=766 WHERE id=3;
/*3.从zhangwu表中选出id   sname   */
SELECT id FROM zhangwu ;
SELECT sname FROM zhangwu ;
/*4.把zhangwu表中的sname去重 */
SELECT DISTINCT sname FROM zhangwu ;
/*5.别名  列名查询   使用关键字as*/
    /*查询money列,定义新的列名m*/
SELECT money AS m FROM zhangwu ;
SELECT money AS ling FROM zhangwu ;
/*6.对列进行运算*/
    /*从zhangwu表中挑选sname ，所有money+1000*/
SELECT sname ,money+1000 FROM zhangwu ;
/*7.数据条件的查询 where， 格式：select 字段 from 表名 where 条件*/
    /*从zhangwu中挑选出sname为吃饭支出的记录*/
SELECT * FROM zhangwu WHERE sname=‘吃饭支出‘;
    /*从zhangwu中挑选出money大于等于100的记录*/
SELECT * FROM zhangwu WHERE money>=100;
    /*从zhangwu中挑选出money在600到700之间的记录*/
SELECT * FROM zhangwu WHERE money BETWEEN 600 AND 700;
/*8.模糊查询*/
    /*从zhangwu表中挑选出sname中有支出的记录*/
SELECT * FROM zhangwu WHERE sname LIKE ‘%支出%‘;
    /*从zhangwu表中挑选出sname中有五个字符的记录*/
SELECT * FROM zhangwu WHERE sname LIKE ‘_____‘;/*五个下划线*/
SELECT * FROM zhangwu WHERE sname LIKE ‘____‘;
    /*从zhangwu表中挑选出sname中不为空的记录*/
SELECT * FROM zhangwu WHERE sname IS NOT NULL;
/*9.排序查询   格式：oderby 列名 asc升序    desc降序*/
SELECT * FROM zhangwu ORDER BY money ASC;
SELECT * FROM zhangwu ORDER BY money DESC;
/*10.聚合函数  count 对表中的数据的个数求和*/
SELECT COUNT(*) AS ‘总数‘ FROM zhangwu ;