SQL Másolás CREATE TABLE Production.TransactionHistoryArchive1 ( TransactionID int IDENTITY (1,1) NOT NULL , CONSTRAINT PK_TransactionHistoryArchive1_TransactionID PRIMARY KEY CLUSTERED (TransactionID) ) ; Create a primary key with clustered index in a new table...
CREATE TABLE customers ( customer_id int PRIMARY KEY, customer_name varchar(50) NOT NULL, customer_email varchar(100) UNIQUE ); 在这个例子中,我们为"customer_id"列添加了一个主键约束,表示它是表的主键。主键约束将确保该列的值唯一且非空。我们还为"customer_name"列添加了一个非空约束,以确保它不...
[ ; ] < table_constraint > ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] (column [ ASC | DESC ] [ ,...n ] ) [ WITH FILLFACTOR = fillfactor |WITH ( <index_option> [ , ...n ] ) ] [ ON { partition_scheme_name (partition_...
SQLCopy CREATETABLE[Production].[TransactionHistoryArchive1] ( TransactionIDINTIDENTITY(1,1)NOTNULL,CONSTRAINTPK_TransactionHistoryArchive1_TransactionID PRIMARYKEYCLUSTERED (TransactionID) ); Create a nonclustered primary key with separate clustered index in a new table ...
SQL CREATETABLE[Production].[TransactionHistoryArchive1] ( TransactionIDINTIDENTITY(1,1)NOTNULL,CONSTRAINTPK_TransactionHistoryArchive1_TransactionID PRIMARYKEYCLUSTERED (TransactionID) ); Create a nonclustered primary key with separate clustered index in a new table ...
syntaxsql Copy -- Create a new table. CREATE TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } ( { column_name <data_type> [ <column_options> ] } [ ,...n ] ) [ WITH ( <table_option> [ ,...n ] ) ] [;] <column_options> ::= [ ...
] referenced_table_name [ ( ref_column ) ] | CHECK ( logical_expression ) } <table_constraint> ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } { NONCLUSTERED ( column_name [ ASC | DESC ] [ ,... n ]) | NONCLUSTERED HASH ( column_name [ ,... n ] ) WITH ...
= column_set_name XML COLUMN_SET FOR ALL_SPARSE_COLUMNS <table_constraint> ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] ( column_name [ ASC | DESC ] [ ,... n ] ) [ WITH FILLFACTOR = fillfactor | WITH ( <index_option> [ ,... ...
When a new row is added to the table, SQL Server Compact provides a unique, incremental value for the column. Identity columns are generally used in conjunction with PRIMARY KEY constraints to serve as the unique row identifier for the table. The IDENTITY property can be assigned only to int...
CREATE TABLE test.game( nId INT PRIMARY KEY AUTO_INCREMENT COMMENT '设置主键自增', szName VARCHAR(128) COMMENT '游戏名字', szPath VARCHAR(256) COMMENT '下载路径' ) COMMENT='表注释'; sql server支持这样的写法吗?知道的人说一下,谢谢。