mysql对表常用操作
- NEXTONE :create
create table testtable(
id int(10) not null auto_increment primary key comment ”,
name varchar(20) not null character set utf8 comment ”,
age int null comment ”,
gender char(2) coment ”,
gmt_created datetime not null comment ”
)engine=innoDB default charset=utf8; - Set the increment sequence: auto_increment
Set the primary key: primary key
Label: comment.
Set the field is not empty: not null
Set the field be empty: null
Format: character set utf8
Char fixed length variable length, varchar
Time type: datetime - NEXTTWO:insert,updae,delete,select pass
- NEXTTHREE:alert:
1.delete column
alter talbe table drop column
2.alert rename
alter table table rename new_table
3.alter drop primary key
alter table table drop primary key
4.alter add primary key
alter table sj_resource_charges add constraint pk_sj_resource_charges primary key (resid,resfromid)
5.add column
alter table table add column_name type not null comment ”
6.change column type
alter table table change column_name new_column_name type not null comment ”
7.alter index_name
alter table table add colunm index_name(index_column_name)
8.alter drop index emp_name
alter table table drop index index_column_name
NEXTFOUR:
drop
Structure of the drop statement will delete tables are dependent constraints (constrain), trigger (trigger), index (index) depends on the table;
The stored procedure / function will be retained, but to the invalid state.
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转载请注明原文链接：mysql对表惯用操作
转载请注明原文链接：mysql对表惯用操作
