MySQL使用筆記

刪除修改

查詢元資料操作

表結構調整

許可權管理

字符集設定

資料匯入和匯出

匯入資料

遠端連線mysql

資料庫備份和複製

mysql 程序資訊

編碼集問題

insert into ticket_info (buyer_openid,ticket_date) 

values
('000751a016bdbf8eb40e7a902f7153c6','2017-12-01'),
('000751a016bdbf8eb40e7a902f7153c6','2017-12-01');

unique索引或primary key重複，無視本條執行語句，即不執行。

insert ignore into `table_name` (`email`, `phone`, `user_id`) 

values ('[email protected]', '99999', '9999');

unique索引或primary key重複，刪除舊記錄，插入新記錄，返回受影響的行（刪除和插入行數的和）。

replace into `table_name`(`col_name`, ...) values (...);

unique索引或primary key重複，則執行舊行update。

insert into table (a, b, c) values (1, 2, 3), (4, 5, 6) on duplicate key update c=values(a)+values(b);

delete from user where user='test';

update user set password='test' where host='11.11.11.11' and user='11';

show variables

show databases

show tables[from db_name]   

show tables like 'ticket%'

show create tables tbl_name

describe tablename
desc tablename
select columns from tablename
show full columns from tablename;

show index from tbl_name [from db_name]

alter table bulletin add citycode varchar(6) not null default 0;

alter table order_info  modify column order_status int(4) not null comment '我的描述';

alter table my_test_db change table_name_new table_name_old char(32) not null default '123';

alter table user drop column news;

create user 'user_name'@'11.11.11.11' identified by 'my_password';

flush privileges;

grant select on db.table to 'username'@'10.254.0.0/255.255.0.0' identified by '***';  

grant select, insert on db_name.table_name to 'user_name'@'10.11.11.11';  
grant all on *.* to user_name@'10.11.11.11'
grant all on *.* to user_name@'10.11.%' identified by '***';

show grants for 'user_name'@'100.76.%';

revoke update,select,delete on db_name.*  from 'user_name'@'10.254.%';

我們建立使用者後，只是寫入了user表，但是並沒有及時寫入許可權表（grant table）。

執行 flush privileges命令，更新grant table，此時grant table裡有了我們剛插入的使用者，才能對它進行許可權修改：

flush privileges;

set names utf8;

show variables like「character_set_%

select * from user_info into outfile '/tmp/table.txt' character set utf8;

mysql -uroot -p123456 -e "select * from order_info" > /tmp/table.txt

mysql -uroot -p123456 -e "select * from order_info" > /tmp/table.xlsx

set names utf8;

load data local infile '/tmp/table.txt' into table user_info;

mysql -h 11.11.11.11 -p3306 -umyusernmae -pmypassword --default-character-set=utf8

mysqldump -h localhost -u root -p123456 guestbook > guestbook2-29.sql

create table mytbl_new like production.mytbl;

insert mytbl_new select * from production.mytbl;

show full processlist;

kill -9 id

mysql使用筆記

mysql安裝 bin mysqld initialize insecure user mysql basedir usr local mysql datadir usr local mysql data mkdir p var run mysqld chown mysql mysql var ru...

mysql使用筆記

建立資料庫 create database database name 刪除資料庫 drop database database name 建立表 最簡單的語法 create table userinfo id int uname varchar 40 address varchar 120 hob...

mysql使用筆記

mysql通用建表語句 create table if not exists stuinfo id int primary key auto increment,自增,主鍵非空唯一，會建立主鍵索引 stuname varchar 20 not null,非空 gender char 1 seat i...