alter table 表名 add +属性+数据类型[长度][NULL |NOT NULL] --给student表添加sno属性 alter table student add sno varchar(15) not null 1. 2. 3. 修改数据类型` alter table 表名 alter column +属性+数据类型 --修改name的数据类型为varchar alter table student alter column name varcher(10) 1....
Is the name of a column in the table. Column names must follow the rules foridentifiersand must be unique in the table. column_name can be up to 128 characters. column_name can be omitted for columns that are created with a timestamp data type. If column_name is not specified, the n...
Creates the new table with Stretch Database enabled or disabled. For more info, see Stretch Database. Important Stretch Database is deprecated in SQL Server 2022 (16.x) and Azure SQL Database. This feature will be removed in a future version of the Database Engine. Avoid using this featur...
記憶體優化 CREATE TABLE 語法: syntaxsql 複製 CREATE TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } ( { <column_definition> | [ <table_constraint> ] [ ,... n ] | [ <table_index> ] [ ,... n ] } [ PERIOD FOR SYSTEM_TIME ( system_star...
若用如下的SQL语句创建一个表S: CREATE TABLE S(S# CHAR(6)NOT NULL,SNAME CHAR(8)NOT NULL, SEX CHR(
The system customizer security role or equivalent privileges in the environment. Users with the system customizer security role can create tables and have access to view and edit standard and custom tables. Apart from self-created table records, the system customizer role doesn’t have the privilege...
正确答案:B 解析:CREATE TABLE表的定义命令,命令中各短语的功能: PRIMARY KEY:用于定义满足实体完整性的主索引。CHECK…ERROR:用于定义域的完整性和出错提示信息。DEFAULT:用于定义默认值。FROEIGNKEY…REFERENCES:用于定义表之间的联系。FREE:用于指明所建立的表是一个自由表,不添加到当前数据库中。NULL或NOTNULL:用...
百度试题 题目欲往表中增加一条记录,应该用哪一条SQL语句( ) A. ALTER TABLE B. INSERT INTO TABLE C. CREATE TABLE D. DROP TABLE 相关知识点: 试题来源: 解析 B.INSERT INTO TABLE 反馈 收藏
CREATETABLE[tblPatient]( [Patient_ID][bigint]IDENTITY(1,1), [Patient_code][varchar](50)NOTNULL, [Patient_name][varchar](50), [Address][varchar](25), [City][varchar](50), [AppointmentDate][datetime], )ON[PRIMARY] Now, run the following query to insert a record with a NULL value....