select a.* , b.adress , b.name from a , b where a.sbNo = b.cdid order by a.sbNo , a.STime select a.a_id, a.a_name, b.b_name from A a, B a where a.b_id = b.b_id //联合查询 insert into table1 (xx,yy,zz) select xx,yy,zz from table2;select axx as id, att as name from tb1 union select bxx as id, btt as name from tb2 整合有关联的两个数据表里的字段 update TableA AS ta, TableB AS tb ...
2.如果是客户端问题,则需编辑配置文件,添加如下一行:[client] default-character-set=utf8本文出自 “小东哥” 博客,谢绝转载!mysql查询时乱码解决办法标签:tables mysql 服务端 客户端 中文 本文系统来源:http://xiaodongge.blog.51cto.com/11636589/1877655
老师提纲 1. create database test2. drop database test3. create table info( code int primary key, name varchar(20) not null)auto_increment 自增长列foreign key(列名) references 主表名(列名) 外键关系 4. drop table info CRUD:1.insert into 表名(列名) values(值) 2.delete from 表名 where 条件 3.update 表名 set 列名=值 where 条件 简单查询 1.最简单查询(查所有数据)select * from 表名; 注:* 代表所...
单表查询SELECT语句完整形式: SELECT select_expr [ , select_expr ... ][FROM tbl_references[WHERE 条件][GROUP BY {col_name | position} [ASC | DESC], ... 分组][HAVING 条件 对分组结果进行二次筛选][ORDER BY {col_name | position} [ASC | DESC], ...排序][LIMIT 限制显示条数]]查询表达式(select_expr)1. 每一个表达式表示想要查询的一列,至少有一列,多个列之间以逗号分隔2. *表示所有列,tbl_name.*可以表示命名的所...
20) not null primary key,#学号Sname varchar(20) not null,#学生姓名Ssex varchar(20) not null,#学生性别Sbirthday datetime,#学生出生年月 Class varchar(20)#学生所在班级 ); insert into student values(‘108‘,‘曾华‘,‘男‘,‘1977-09-01‘,‘95033‘); insert into student values(‘105‘,‘匡明‘,‘男‘,‘1975-10-02‘,‘95031‘); insert into student values(‘107‘,‘王丽‘,‘女‘,‘1976-01-23‘,‘95033‘)...
Select distinct productname from custom_Where product_price between 5 and 10Order by product_price desc ,product_nameLimit 3 offset 1; Limit 限定从1行开始选出3行,默认列是从0列开始的。 分号 或\g表示语句结束Help 或 \h 获取帮助quit或exit 退出distinct作用与后面所有列,不能部分使用查询order默认升序asc(ascend) 默认 A与a视为相同顺序, *代替所有列 Order by 放在where之后 MySQL默认不区分大小写...
use information_schema select concat(round(sum(DATA_LENGTH/1024/1024),2),‘M‘),concat(round(sum(INDEX_LENGTH/1024/1024),2),‘M‘) from tables where table_schema=’mytest’ AND table_name=’test’; 文章来源链接: http://www.cnblogs.com/diandiandidi/p/5582309.html mysql查询表的数据大小标签:use concat where log http nbsp from href sum 本文系统来源:http://www.cnblogs.com/lix...
<img alt="技术分享" src="http://www.mamicode.com/data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEAYABgAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/2wBDAQkJCQwLDBgNDRgyIRwhMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjL/wgARCAGeA3MDASIAAhEBAxEB/8QAGgABAAMBAQEAAAAAAAAAAAAAAAMEBQIBBv/EABcBAQEBAQAAAAAAAAAAAAAAAAABAgP/2gAMAwEAAhADEAAAAfvw...
mysql查询当天的所有信息: select * from test where year(regdate)=year(now()) and month(regdate)=month(now()) and day(regdate)=day(now())这个有一些繁琐,还有简单的写法: select * from table where date(regdate) = curdate();另一种写法没测试过查询当天的记录 select * from hb_article_view where TO_DAYS(hb_AddTime) = TO_DAYS(NOW())date()函数获取日期部分, 扔掉时间部分,然后与当前日期比较即可补充:本周、上...
select * into outfile ‘/data/var-3307/catid.xls‘ from help_cat where 1 order by cat_id desc limit 0,20;select * into outfile ‘导出文件存放目录‘ from 表面和查询条件等信息! 请注意权限问题,如果实在不行,放在/tmp 目录下 方法二:在shell命令行下把Excel以文本方式打开,然后另存为,在编码选择ansi编码保存语法格式Example: echo "select * from db_web.help_cat where 1 order by sort desc limit 0,20" | m...
1.本年份SELECT DATE_FORMAT(NOW(), ‘%Y‘);2.本月份(显示数字)SELECT DATE_FORMAT(NOW(), ‘%m‘);3.本月份(显示英文)SELECT DATE_FORMAT(NOW(), ‘%M‘);4.本日期(显示数字)SELECT DATE_FORMAT(NOW(), ‘%d‘);5.本日期(显示数字和字母,如:16th)SELECT DATE_FORMAT(NOW(), ‘%D‘);6.当前时间(11:54:23)SELECT DATE_FORMAT(NOW(), ‘%T‘);7.当前时间(11:54:23) select DATE_FORMAT(now(),‘%Y-%m-%d %h:%i:%s‘)...
#_*_coding:utf-8_*_ import MySQLdbDBHOST = "192.168.89.101" DBUSER = "root" DBPASSWD ="1qaz#EDC" DB = "soms" PORT = 3306 CHARSET = "utf8"#建立与数据库的连接 conn = MySQLdb.connect(host=DBHOST, user=DBUSER, passwd=DBPASSWD, db=DB, port=PORT, charset=CHARSET) cur = conn.cursor() #建立游标,Python是通过游标执行SQL语句#从数据库中查询数据 results = cur.execute("select * from discovery") print results结...
SELECT * from t_yymp_auth_role where role_name not like ‘%测试%‘ and role_name not like ‘%部门%‘ and role_name not like ‘%方案%‘ and role_name not like ‘%项目%‘ 记录一下 mysql 的查询中like字段的用法标签:mysql role logs 方案 测试 auth img nbsp select 本文系统来源:http://www.cnblogs.com/zhujiasheng/p/6498532.html
INSERT INTO 目标表 (字段1, 字段2, ...) SELECT 字段1, 字段2, ... FROM 来源表 WHERE not exists (select * from 目标表 where 目标表.比较字段 = 来源表.比较字段); mysql把查询到不一样的记录插入到另一张表中标签:not 记录 style mysq div 字段 where into sel 本文系统来源:http://www.cnblogs.com/wodetian/p/6510504.html
查询“95031”班的学生人数。SELECT COUNT(CLASS) as 9501班 FROM student WHERE class="95033"; 查询‘3-105’号课程的平均分SELECT AVG(degree) FROM score WHERE CNO="3-105";SELECT avg(degree) 平均分 from score GROUP BY cno HAVING cno = ‘3-105‘; 查询成绩表中至少有5名学生选修的并以3开头的课程的平均分数。SELECT CNO,avg(degree) from score GROUP BY CNO HAVING COUNT(*)>5 and CNO like "3%";查询最低分大于70...