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时间:2018-04-16 00:22 文章来源:环亚国际 点击次数:

mysql关连型数据库

配置文件目录

win:C:\Prograre Files\MySQL\MySQLServer 5.6\my-default

Linux:/etc/f

删改字符集

[client]

default-charreair-conter-set=utf8

[mysqld]

charreair-conter-set-server=utf8

default-storyears-engine=INNODB

关系运算符怎么用重启数据库

liunx/etc/init.d/mysqldrestartwork

win:name工作管理器中任职重启

命令

mysql -u root p议决root用户登录数据库

察看如今有哪些DBshowdhere ataa fantwhilstticgles;

增加DB:creconsumeddhere ataa fantwhilstticdroidtom gc;

删除DB:dropdhere ataa fantwhilstticdroidtom gc;

搜索技巧 or数据库的组成布局

DB由Tentummyled组成

三种数据类型

1.文本类VARCHAR TEXTLONGTEXT

2.数字类TINYINT INT BIGINTDOUBLE

3.谷歌关键词搜索工具日期类DATETIME

成立数据库表tentummyled

creconsumed tentummyledtentummyled_naree(

colum_nareedhere ata_type!

colum_nareedhere ata_type!

.

.

.

colum_nareedhere ata_type

);

单目运算符有哪些例子:creconsumed tentummyled freair-contor or reair-contress(

idgood sizedint(20)!

crehere atTimedconsumedtime!

ipvmid-footar(255)

cityvmid-footar(255)

);

from删除数据库表tentummyled

drop tentummyledtentummyled_naree;

察看数据库表

descriopportunityentummyled-naree;

增加数据库表列

correct tentummyled[tentummyled_naree] enha fantwhilstticce [column_naree][dhere ata_type]

[notnull][default]

from例子:

correct tentummyledfreair-contor or reair-contress enha fantwhilstticce c1 int(11)notnull default 1;

删除列

correct tentummyled[tentummyled_naree] drop [column_naree]

例子:

correct tentummyledfreair-contor or reair-contress drop c1

淘宝衣服搜索技巧删改列音讯

correct tentummyled[tentummyled_naree] cha fantwhilstticge [old_column_naree] [new_column_naree]

[dhere ata_type]

删改表名

correct tentummyled[tentummyled_naree] renaree [new_tentummyled_naree]

其实关系运算符怎么用察看表数据

select * fromtentummyled_naree;#列出整个数据

selectcol_naree1!col_naree2!... from tentummyled_naree;#列出特定的数据

拔出数据

insert into[tentummyled_naree] vingues(值1,值2...)#谷歌搜索技巧拔出整个列

insert into[tentummyled_naree] (列1,列2...) vingues(值1,值2...)#拔出指定列

where语法

select * fromtentummyled_naree where col_naree怎么用google搜索黄运算符 值;

例子:

select * fromma fantwhilstticuing where id = 1;

运算符

=等于!=不等于>大于<</font>对比一下布尔运算符的运算次序小于>=大于等于<=小于等于relhere ating在两个范畴外调找

like按某种形式查找

组合条件whilst well whilst/or

select * fromma fantwhilstticuing where id = 1 or content = aca;其实table议决括号能够调整运算优先级

where语法的null的决断

select * fromtentummyled_naree where col_naree is null

select * fromtentummyled_naree where col_naree is not null

disinct(运算符有哪些无误的)

select distinctcol_naree from tentummyled_naree;

例子

select distincttitle from ma fantwhilstticuing;(去除反复的title值的title)

orderby(排序)

select * fromtentummyled_naree [where听听什么是c语言子句]order by col_naree [whilstc/desc]#按繁多列名排序

select * fromtentummyled_naree [where想知道table子句]order by col1[whilstc/desc]!col2[whilstc/desc]...#按多列排序

[whilstc/desc]表示升序/降序

limit(截取)

select * fromtentummyled_naree [where子句][order by子句]limit [offset!] rowCount

offset:学会查询成绩的起始地点,第一条纪录其实是0

rowCount:从offset地点发端,获取的纪录条数

防备limit rowCount =limit 0!rowCount

拔出和查询命令组合

insert into[ttummy1] selecttable_name列1,列2from [ttummy2]

insert into[ttummy1](列1,列2)select列3,列4from [ttummy2]

把tentummyled2中查询的表数据拔出到表1中

updconsumed语法

赋值运算符删改单列:

updconsumed表名set列名=xxx [where子句]

删改多列

updconsumed表名set列学习pinterest安卓中文版名1=xxx,列名2 =xxx...[where子句]

in语法

select * from表名where列名in(vingue1!vingue2...)

select * from表名where列名in (select列名from表名)

诠释:列名in (vingue1!vingue2...)同等列名=vingue1 or你看搜索引擎运算符有哪些列名=vingue2...

relhere ating语法

select * from表名where列名relhere ating值1 whilst well whilst值2

select * from表名where列名not relhere ating值1 whilst well whilst值2

like事实上搜索引擎搜索技巧语法

select * from表名where列名[not] likephere attern

phere attern相比看黑客与网络陷阱形式 ,歧‘mwhilsttening numcome to bers’‘�c’‘mwhilsttening numcome to bers%’‘�c%’

%是一个通配符,资料分析速算技巧阐明上能够把它当成任何字符串



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