Oracle PL/SQL:CREATE TABLE statement: create a table with primary key.CREATE TABLE statement can be used to create table objects in database. It is possible to add constraints like primary key ,foreign key while table creation.Primary key is the unique identifier for a row of data.One ...
Create Table Foreign Key Syntax Like the primary key definition, you can declare a foreign key both inline and out of line in the SQL Create Table command. Inline foreign keys are declared like this: CREATEtable_name(column_name data_typeREFERENCESother_table_name(other_column_name),...); ...
-- create a table named Companies with different columnsCREATETABLECompanies (idint,namevarchar(50), addresstext, emailvarchar(50), phonevarchar(10) ); Here, the SQL command creates a database namedCompanieswith the columns:id,name,address,emailandphone. SQL CREATE TABLE Syntax CREATETABLEtable_...
解析 PRIMARY KEY 在Visual FoxPro中,使用SQL的CREATE TABLE语句建立数据库表时,"PRIMARY KEY"子句用于定义主索引。主索引用于唯一标识表中记录,确保字段的唯一性且不能重复,PRIMARY KEY是该功能的标准SQL语法关键字。该问题陈述完整,语法规则正确,因此应选择此子句。
百度试题 题目在SQL中,用Create Table 语句建立表时,用Primary Key 进行定义( )。 A. 主关键字 B. 关键字 C. 候选码 D. 外码 相关知识点: 试题来源: 解析 B.关键字 反馈 收藏
Simple CREATE TABLE syntax (common if not using options): syntaxsql Copy CREATE TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } ( { <column_definition> } [ ,... n ] ) [ ; ] Full syntax Disk-based CREATE TABLE syntax: syntaxsql Copy CREATE...
syntaxsql 复制 -- 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> ::= [ ...
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 ...
create table cong ( code int Primary key, name varchar(20), zhu int, foreign key【代表外键】 (zhu) references【引用】 zhu ( code)[ 建立外键关系 ] ) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 样式:foreign key(列名) references 主表名(列名) 外键 ...
createtableDepartment-( --创建部门编号;int代表整数类型;primary key代表主键;identity(1,1)代表从1开始步长为1自增长; DepartmentIdintprimarykeyidentity(1,1), --创建部门名称;nvarchar(50)代表长度50的字符串;not null代表不能为空; DepartmentName nvarchar(50)notnull, ...