时间:2021-07-01 10:21:17 帮助过:2人阅读
status
查看数据状态,參数
show status
改动mysqlpassword
mysqladmin -u root -p password {new_password}
同意mysql远程连接
update user set host = ‘%‘ where user = ‘root‘;
查询表定义
show create table {table_name};
show columns from {table_name};
describe {table_name};
创建数据库
create database {databas_name}
删除数据库
drop database {databas_name}
新建表
create table tabname(col1 type1 [not null] [primary key],col2 type2 [not null],..)
create table table1(
-> col1 int primary key,
-> col2 int,
-> col3 varchar(30),
-> )
-> ;
create table Teacther
(
tNo int primary key,
tName varchar(50) not null,
tSex varchar(2) not null check (tsex in (‘男‘,‘女‘)),
tBirthDate datetime not null,
tSalary decimal(18,2),
tHairDate datetime,
depNo int
foreign key(depNo) references Depart(depNo)
)
依据已有的表创建新表
create table {new_table_name} like {old_table_name}
create table {new_table_name} as select {[col1_name],[col2_name}, …} from {old_table_name} definition only
插入数据
insert into {table_name} (field1,field2) values(value1,value2);
insert into table1 (col1,col2,col3) values(1,1,"aaa");
更新数据
update {table_name} set {field1}={value1} where {condition};
update table1 set col3="zzz" where col1=1;
查询数据
select {field1,field2} from {table_name} where {condition};
select * from table1;
select distinct {column} from {table_name} 显示唯一值
select {column} from {table_name} limit {num} 限制检索的行数
select {column} from {table_name} limit {num1, num2} 从第num1開始的num2个行
select {column} from {table_name} order by {column} desc; 按降序排列
select {column} from {table_name} where {column} between {num1} and {num2} 范围查找
select {column} from {table_name} where {column} is null 查找空值
select from where group by having order by limit
删除数据
delete from {table_name} where {condition};
delete from table1 where col1=2;
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mysql经常使用的命令
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