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  • SQL--from w3c school

    使用mysql:

    mysql -u root -p

    打开对应系统服务 services.msc

    1、

    select row from table;

    select * from table;

    2、

    利用where子句查

    select row from table where a(=、<>、>、<、>=、<=、between、like)b;

    select row from table where A AND B;

    select row from table where A OR B;

    select row from table where (A AND B) OR B;

    3、对查询结果排序

    select row from table order by row; 对row结果排序,默认递增

    select row from table order by row desc;递减排序

    4、增

    insert into table (row1,row3) values('.' , .);

    insert into table values('.' , . , .);

    5、改

    update table set Name='Tom',Address='BeiJing where id=3;

    6、删

    delete from table where ..;

    delete * from table;

    7、select * from table LIMIT 5;最多显示5条记录

    select TOP 2 * from table;查询前两条记录

    select TOP 50 PERCENT * from table;查询50%的记录

    8、Where子语句的like模式

    select * from where Name like 'j%';以j开头

    select * from where Name like '%j';以j结尾

    select * from where Name like '%j%';含有j

    select * from where Name NOT like 'j%';不含有j

    通配符

    % 代表若干字符

    - 仅代表一个字符

    [ ] 字符列中任何单一字符

    [!] 不在字符列中的任何单一字符

    9、在where子语句中规定多个值

    select * from table where name IN ('Mike','Tom');

    10、向mysql中导入文本

    http://www.cnblogs.com/wingjay/p/3845368.html

    新建表格 create table person(id int primary key auto_increment,name varchar(32) not null,age tinyint, address varchar(128));

    新建data.txt

    因为ID是自增长,可以不输入,只输入后面的信息,tab空格:

    zhangsan  30  BeiJing

    lisi  23  shanghai

    (desc+表名 :可以查看该表的各列名称;s可以查看当前目录)

    加载文件:load data local infile "F:/data.txt" into table person(name,age,address); 因为文件中无id信息,故要指明列。

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  • 原文地址:https://www.cnblogs.com/wingjay/p/3847499.html
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