Live SQL是官方推出的免费的在线SQL学习工具,在里面我们可以运行自己的SQL,并保存下来,同时可以和他人分享 2. 这样我们可以不用自己搭测试环境来学习Oracle SQL 3. 网址是livesql.oracle.com 如何使用 注册账号后我们进入该网站 数据库版本为12.2.0.1.0企业版 可在SQL worksheet里进行练习,Session暂时保存你的语句,...
You can see that an ID will have been automatically generated. You can now insert into the EMPLOYEES table a new row but you will need to put the generated DEPTID value into your SQL INSERT statement. The examples below show how we can do this using a SQL query, but you could simply ...
This statement creates a simple external table that can read JSON documents from a dump file generated by a typical No-SQL style database. In this case, the documents are contained in the file purchaseOrders.json. The SQL directory object ORDER_ENTRY points to the folder containing the dump ...
Prerequisite SQL create table toys ( toy_id integer not null primary key, toy_name varchar2(100) not null, weight number(10, 2) not null, quantity_of_stuffing integer, volume_of_wood integer, times_lost integer ); insert into toys values (1, 'Mr. Penguin', 50, 100, null, 10); ...
That volume of data is not supported in LiveSQL sessions, so the results you see here will be less dramatic, but the pattern is the same. The significantly faster response time with the pipelined function demonstrates clearly that the INSERT-SELECT statement was able to keep track of rows ...
After a sequence is created, you can access its values in SQL statements with the CURRVAL pseudocolumn, which returns the current value of the sequence, or the NEXTVAL pseudocolumn, which increments the sequence and returns the new value. ...
The distinct operator adds an extra sorting step to your SQL. So in most cases you'll want to use union all. Save plain union for when you know you want to remove duplicate rows. Module5 Try It! Complete this query to return a list of all the colours in the two tables. Each colour...
在OOW前夕,我才注意到Oracle在10月14日发布的网站:livesql.oracle.com,这是由Oracle的SQL专家Steven Feuerstein在交流中介绍的。这是一个在线SQL学习、脚本分享、脚本管理平台。 在这个平台,你可以直接运行、测试、分享你的脚本,这将非常有用,在很多测试中,你不再需要复杂的接入自己的测试环境。而且,这个平台是免费...
在浏览器中输入以下URL,访问Live SQL网站。http://livesql.oracle.com 登录和注册 如果想体验其Live SQL,需要Oracle.com 帐户登录即可开始体验,点击右上角【Sign In】进行登录。如果你有Oracle.com 帐户的话,可以直接在【Oracle 账户登录】中输入用户名和密码进行登录,开始体验Live SQL。如果还没有Oracle.com ...
Note:LiveSQL doesn't support external tables. So these statements will fail! When you query this table, it will read from the file: /path/to/file/toys.csv This file must be accessible to the database server. You cannot use external tables to read files on your machine!