mysql|oracle
Oracle 和 mysql 的一些简单命令对比参照
Oraclemysql对比版本Personal Oracle7 Release 7.3.4.0.0mysql 3.22.34-shareware-debug启动画面
(点击放大)默认安装目录C:\ORAWIN95C:\MYSQL各种实用程序所在目录C:\ORAWIN95\BINC:\MYSQL\BIN控制台工具SVRMGR.EXE
SVRMGR23.EXEmysqladmin.exe数据库启动程序0start73.exe screenmysqld-shareware.exe关闭数据库命令ostop73.exemysqladmin.exe -u root shutdown客户程序SQL*Plusmysql启动命令c:\orawin95\bin\sqlplus.exec:\mysql\bin\mysql.exe带用户启动方式
(直接连库方式)c:\orawin95\bin\sqlplus.exe system/manager@TNSc:\mysql\bin\mysql.exe test
c:\mysql\bin\mysql.exe -u root test安装后系统默认用户(库)sys
system
scottmysql
test显示所有用户(库)SQL >select * from all_users;C:\mysql\bin>mysqlshow
C:\mysql\bin>mysqlshow --status
mysql> show databases;退出命令SQL> exit
SQL> quitmysql> exit
mysql> quit改变连接用户(库)SQL> conn 用户名/密码@主机字符串mysql> use 库名查询当前所有的表SQL> select * from tab;
SQL> select * from cat;mysql> show tables;
c:\mysql\bin>mysqlshow 库名显示当前连接用户(库)SQL> show usermysql> connect查看帮助SQL> ?mysql> help显示表结构SQL> desc 表名
SQL> describe 表名mysql> desc 表名;
mysql> describe 表名;
mysql> show columns from 表名;
c:\mysql\bin>mysqlshow 库名 表名日期函数SQL> select sysdate from dual;mysql> select now();
mysql> select sysdate();
mysql> select curdate();
mysql> select current_date;
mysql> select curtime();
mysql> select current_time;
日期格式化SQL> select to_char(sysdate,'yyyy-mm-dd') from dual;
SQL> select to_char(sysdate,'hh24-mi-ss') from dual;
mysql> select date_format(now(),'%Y-%m-%d');
mysql> select time_format(now(),'%H-%i-%S');
日期函数
(增加一个月)SQL> select to_char(add_months(to_date('20000101','yyyymmdd'),1),'yyyy-mm-dd') from dual;
结果:2000-02-01
SQL> select to_char(add_months(to_date('20000101','yyyymmdd'),5),'yyyy-mm-dd') from dual;
结果:2000-06-01
mysql> select date_add('2000-01-01',interval 1 month);
结果:2000-02-01
mysql> select date_add('2000-01-01',interval 5 month);
结果:2000-06-01
别名SQL> select 1 a from dual;mysql> select 1 as a;字符串截取函数SQL> select substr('abcdefg',1,5) from dual;
SQL> select substrb('abcdefg',1,5) from dual;
结果:abcdemysql> select substring('abcdefg',2,3);
结果:bcd
mysql> select mid('abcdefg',2,3);
结果:bcd
mysql> select substring('abcdefg',2);
结果:bcdefg
mysql> select substring('abcdefg' from 2);
结果:bcdefg
另有SUBSTRING_INDEX(str,delim,count)函数
返回从字符串str的第count个出现的分隔符delim之后的子串。
如果count是正数,返回最后的分隔符到左边(从左边数) 的所有字符。
如果count是负数,返回最后的分隔符到右边的所有字符(从右边数)。
执行外部脚本命令SQL >@a.sql1:mysql> source a.sql
2:c:\mysql\bin>mysql
imp.exe
imp73.exemysqldump.exe
mysqlimport.exe改表名SQL> rename a to b;mysql> alter table a rename b;执行命令;
/
r
run;
go
egodistinct用法SQL> select distinct 列1 from 表1;
SQL> select distinct 列1,列2 from 表1;mysql> select distinct 列1 from 表1;
mysql> select distinct 列1,列2 from 表1;注释--
/*与*/#
--
/*与*/当作计算器SQL> select 1+1 from dual;mysql> select 1+1;限制返回记录条数SQL> select * from 表名 where rownum select * from 表名 limit 5;新建用户(库)SQL> create user 用户名 identified by 密码;mysql> create database 库名;删用户(库)SQL> drop user 用户名;mysql> drop database 库名;外连接使用(+)使用left join查询索引SQL> select index_name,table_name from user_indexes;mysql> show index from 表名 [FROM 库名];通配符“%”“%”和“_”SQL语法SELECT selection_list 选择哪些列
FROM table_list 从何处选择行
WHERE primary_constraint 行必须满足什么条件
GROUP BY grouping_columns 怎样对结果分组
HAVING secondary_constraint 行必须满足的第二条件
ORDER BY sorting_columns 怎样对结果排序
SELECT selection_list 选择哪些列
FROM table_list 从何处选择行
WHERE primary_constraint 行必须满足什么条件
GROUP BY grouping_columns 怎样对结果分组
HAVING secondary_constraint 行必须满足的第二条件
ORDER BY sorting_columns 怎样对结果排序
LIMIT count 结果限定

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