[ ; ]< table_constraint >::=[CONSTRAINTconstraint_name] { {PRIMARYKEY|UNIQUE} [CLUSTERED|NONCLUSTERED] (column [ASC|DESC] [ ,...n ] ) [WITHFILLFACTOR= fillfactor |WITH(<index_option>[ , ...n ] ) ] [ON{partition_
CREATE TABLE 會在 Azure Synapse Analytics、Analytics Platform System (PDW) 和Microsoft網狀架構數據倉儲中建立新的數據表。
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...
SQL Cóipeáil CREATE TABLE [Production].[TransactionHistoryArchive1] ( TransactionID INT IDENTITY(1, 1) NOT NULL, CONSTRAINT PK_TransactionHistoryArchive1_TransactionID PRIMARY KEY CLUSTERED (TransactionID) ); Create a nonclustered primary key with separate clustered index in a new table...
SQL CREATETABLEMyTable ( colAintCONSTRAINTconstraint_colADEFAULT0, colBnvarcharCOLLATEFrisian_100_CS_AS )WITH( CLUSTERED COLUMNSTOREINDEX) ; 临时表的示例 C. 创建本地临时表 下面的示例创建名为“#myTable”的本地临时表。 此表的指定名称包含三个部分(以 # 开头)。
] 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 ...
] 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 ...
] 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 ...
< table_constraint > ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] (column [ ASC | DESC ] [ ,...n ] ) [ WITH FILLFACTOR = fillfactor |WITH ( <index_option> [ , ...n ] ) ...
To create a table with a primary key, we can write the following command. In MySQL CREATETABLECompanies (idint,namevarchar(50), addresstext, emailvarchar(50), phonevarchar(10), PRIMARYKEY(id) ); In Oracle and SQL Server CREATETABLECompanies (idintNOTNULLPRIMARYKEY,namevarchar(50), ...