数据库核心の增删改查
创建数据库:
create database myFirstDatabase
删除数据库:
Drop database myFirstDatabase
Drop database myFirstDatebase
注意事项:
创建表:
create table name_of_table
(
name_of_column_datatype
)
更改现有表:
添加一个新列:
alter table name_of_table
add name_of_field data_type
删除现有列:
alter table name_of_table
drop column name_of_field
添加一个新列
create table name_of_table
(
name_of_column column_datatype
)
删除一个表:
drop table name_of_table
插入新数据:
insert into table_name(column_names) values(data-values)
查看数据:
select * from gategory
更新数据库:
update table_name
set column_name=value
where condition
删除字句:
delete from menberdetails;
delete from memberdetails where memberid=3