you must use a table constraint instead of acolumn constraint. Setting a single column as the primary key within the column definition is called acolumn constraint. Defining the primary key (single or composite) outside of the column definition ...
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用下面的T-SQL语句建立一个基本表: CREATE TABLE Student(Sno CHAR(4) PRIMARY KEY, Sname CHAR(8) NOT NULL, Sex CHAR(2), A. ge INT) B. 可以插入到表中的元组是( ) C. '5021','刘祥',男,21 D. NULL,'刘祥',NULL,21 E. '5021',NULL,男,21 F. '5021','刘祥',NULL,NULL ...
下面的T-SQL可以生成索引在当前数据库的外键上, 可以帮助我们找回外键上丢失的索引,查看索引命名是否规范。 -- declare memory tableDECLARE @INDEX_TABLE TABLE( primary_key INT IDENTITY(1,1) NOT NULL, sche
SQL 复制 CREATE TABLE [dbo].[T1] ( [c1] [int] NOT NULL, [c2] [float] NOT NULL, CONSTRAINT [PK_T1] PRIMARY KEY NONCLUSTERED ([c1]) ) WITH ( MEMORY_OPTIMIZED = ON , DURABILITY = SCHEMA_AND_DATA ) GO CREATE PROCEDURE [dbo].[usp_1] WITH NATIVE_C...
用下面的T-SQL语句建立一个基本表: CREATE TABLE Student(Sno CHAR(4) PRIMARY KEY, Sname CHAR(8) NOT NULL, Sex CHAR(2), Age INT) 可以插入到表中的元组是 A. <br/> '5021','刘祥',男,21 B. <br/> NULL,'刘祥',
SQL CREATETABLEdbo.Products (ProductIDintPRIMARYKEYNOTNULL, ProductNamevarchar(25)NOTNULL, Price moneyNULL, ProductDescriptionvarchar(max)NULL)GO 在資料表中插入及更新資料 既然您現在建立好Products資料表,就可以準備使用 INSERT 陳述式,將資料插入資料表。 在插入資料後,您將使用 UPDATE 陳述式來變更資料列的...
syntaxsql Copy [ FROM { <table_source> } [ , ...n ] ] <table_source> ::= { table_or_view_name [ FOR SYSTEM_TIME <system_time> ] [ [ AS ] table_alias ] [ <tablesample_clause> ] [ WITH ( < table_hint > [ [ , ] ...n ] ) ] | rowset_function [ [ AS ] table...
用下面的T-SQL语句建立一个基本表:CREATE TABLE Student(Sno CHAR(4) PRIMARY KEY,Sname CHAR(8) NOT NULL,Sex CHAR(2),Age INT)可以插入到表中的元组是()。A、'5021','刘祥',男,21B、NULL,'刘祥',NULL,21C、'5021',NULL,男,21D、'5021','刘祥',NULL,NULL 请帮
Feature FOREIGN KEY Applies to: Azure SQL Database and SQL Server starting SQL Server 2016 (13.x)For memory-optimized tables, FOREIGN KEY constraints are only supported for foreign keys referencing primary keys of other memory-optimized tables. Remove the constraint from the table definition if th...