Methods as below:
E.g:
create table student(
Sno int identity(1,1) primary key,
Sname varchar(100)
)
Sno field so that we can achieve self-growth, the first parameter is the identity seed (that is, the start value), and the second parameter is the identification value (how many increments)
Here we begin to 1, increments of 1
If you do insert, then:
insert into student values ( 'John Doe')
Note values which do not write from value-added field name, because the database will automatically help you generate.
1 example, the first behavior Xiaoming
insert into student values ( 'John Doe')
Xiao Ming to 1
John Doe 2
Extended Information:
SQL Server: Modify field properties summary
1: add a field to the table
Alter table [table] the Add [Column Name] Type
2: Remove fields
Alter table [table name] drop column [Column Name]
3: Modify table field types (column type can be modified, is empty)
Alter table [table] alter column [Column Name] Type
4: Add the primary key
Alter table [table] add constraint [constraint name] primary key ([Column Name])
5: Adding a unique constraint
Alter table [table] add constraint [constraint name] UNIQUE ([Column Name])
6: Add a list of default values
Alter table [table] add constraint [constraint name] default (default value) for [Column Name]
7: Adding constraints
Alter table [table] add constraint [constraint name] Check (Content)
8: add foreign key constraint
Alter table [table] add constraint [constraint name] foreign key (column names) referencese another table (column names)
9: Remove the constraint
Alter table [table] add constraint [constraint name]
10: rename table
exec sp_rename '[original table name]', '[new table name]'
11: Rename the column name
exec sp_rename '[table]. [column name]', '[table name]. [new column name]'