sql server create table primary key autoincrement

Postgresql has the following three ways to set the primary key increment, the following look at the same point and different points.--Method OneCREATE TABLE Test_a(ID Serial,Name character varying (128),Constraint pk_test_a_id primary key (ID));Notice:create

constraint that is automatically defined. Note that each table can have multiple UNIQUE constraints, but there can be only one PRIMARY KEY constraint per table. CREATE TABLE Persons ( UNIQUE , LastName varchar (255) Not NULL, F

JDBC Gets the table structure, primary keyTags: jdbctablenullschema database mysql2012-02-16 22:13 11889 People read comments (0) favorite reports Classification:Java (+)Suppose there's a con.DatabaseMetaData Dbmd = Con.getmetadata ();rs = Dbmd.getcolumns (Con.getcatalog (), schema, tableName, NULL);Rs.getstring (data_type) Java.sql.Types SQL typeThe size of t

Modify the Data Type of the column corresponding to the primary key of an Oracle database table When upgrading our product from SPC100 to SPC200, because the data type of the database table column has changed, you need to write an SQL script to complete the Database Upgrade

Modify the Data Type of the column corresponding to the primary key of the Oracle database table. When upgrading our product from SPC100 to SPC200, because the data type of the database table column has changed, you need to write an SQL script to complete the Database Upgra

I hope that I can clearly analyze the primary and foreign key tables and field information like SQL Server, use an SQL statement to write out the one-to-one correspondence between the fields in the primary and foreign

Create a primary key (example) SQL> alter table emp_ogg add constraint PK_empno primary key (empno ); -- Create a

Most databases have many primary keys, but the same primary key of two records cannot have the same value in a table. You can use Java database connectivity (JDBC) to determine the primary key of a data

-Create a student table, set the primary key for the table to be the numberCREATE TABLE Student (Sno VARCHAR2 (Ten) PRIMARY KEY,--column-lev

when inserting data into a table, if the primary key is a self-growing type, then we can not assign a value to the primary key column, but sometimes the primary key is exactly the forei

Use after an SQL statement SCOPE_IDENTITY () Of course, you can also use SELECT @ IDENTITY However, the use of SELECT @ IDENTITY is globally up-to-date. incorrect values may be obtained. Example:Copy codeThe Code is as follows: insert into dbo. SNS_BlogData (userName) values ('jiangyun ');SELECT SCOPE_IDENTITY () Gets the primary key return value for the insert

SQL PRIMARY KEY instance tutorial Database primary key constraintsThe primary key constraint uniquely identifies each record in a database table.The

= male) Five. Set the CHECK constraint. Check Age int check (age between), Six. Auto-grow. Auto_increment to be used on the primary key: Create TABLE box (ID int auto_increment primary key) Seven. Foreign

Primary Key of the InnoDB Storage engine table In the InnoDB Storage engine, tables are organized and stored in the order of primary keys. In an InnoDB Storage engine table, each table has a