a) 用SQL语言CREATE TABLE语句创建学生表student、课程表course和选课表SC;(字段类型及长度参照实验一) b)创建供应商-零件数据库以及表,表要求如下: 建立一个供应商、零件数据库。 其中“供应商”表S(Sno,Sname,Status,City)分别表示:供应商代码、供应商名、供应商状态、供应商所在城市。
Create Table Exercise You have just started a new company. It is time to hire some employees. You will need to create amyemployeestable that will contain the following information about your new employees:firstname,lastname,title,age, andsalary. Once it’s created successfully, go to the “...
mysql>createdatabase course; mysql>use course; mysql>createtabledept(idintauto_incrementprimarykey,dept_namevarchar(64)); mysql>createtablestudents(sidintauto_incrementprimarykey,snamevarchar(54),gendervarchar(12),dept_idintnotnull,constraintfor_1foreignkey(dept_id)referencesdept(id)); mysql>createta...
mysql>createtablestudents_copylikestudents; Query OK,0rowsaffected (0.03sec) create table ... as select语句表示创建表的同时将select的查询结果数据插入到表中,但索引和主外键信息都不会同步过来 ##复制所有字段上的数据 mysql>createtablestudents_copy2asselect*fromstudentswheresid=1; Query OK,1rowaffected...
You can start withCREATE TABLE. Of course, you can also go and take a full SQL course or read a book about SQL, but you don't need more than what I'll explain here on the tutorial to start being productive withSQLModel. 🤓 ...
【Transact-SQL】CREATE TABLE :Student、Course、SCle**ss 上传 char 教材中有三张表:Student、Course、SC。 后面的例子会反复用到,因此,第一次SQL实验要先把表建好。 建表的时候要注意:SC表必须最后建立,原因是sno和cno需要参照另外两张表里面的sno和cno。 CREATE TABLE Student ( Sno CHAR(9) PRIMARY KEY...
First, we need to get the data into Excel from SQL Server by simply clicking on the relevant table in the SQL Spreads Designer. Now comes the clever part! We’re going to pivot the table on the Course column, and in so doing, ‘placeholders’ will be created for all the data we nee...
1、PLSQL中的数组共分三类: I - 嵌套表(Nested tables) TYPE nested_type IS TABLE OF VARCHAR2 ( 30 ) [not null]; -- 值为 varchar2 的数组,下标为默认 int ; 1. 2. 特征:可删除信息,下标不变 II - 变长数组(Variable-Sized Arrays) ...
--建立学生信息表Students create table Students ( SId char(5) not null primary key, SNa...
教材中有三张表:Student、Course、SC。 后面的例子会反复用到,因此,第一次SQL实验要先把表建好。 建表的时候要注意:SC表必须最后建立,原因是sno和cno需要参照另外两张表里面的sno和cno。 CREATE TABLE Student ( Sno CHAR(9) PRIMARY KEY, /* 列级完整性约束条件,Sno是主码*/ Sname CHAR(20) UNIQUE, /...