drop sql語句

介紹 (Introduction)

This guide covers the SQL statement for dropping (deleting) one or more view objects.

本指南介紹了用于刪除(刪除)一個或多個視圖對象SQL語句。

A View is an object that presents data from one or more tables.

視圖是顯示來自一個或多個表的數(shù)據(jù)的對象。

Note: before deleting or changing data or objects, remember to have a fresh backup.

注意：刪除或更改數(shù)據(jù)或?qū)ο笾?#xff0c;請記住要進行全新備份。

We will cover:

我們將介紹：

• Using SQL to drop a table
  使用SQL刪除表
• Using the workbench to drop a view
  使用工作臺刪除視圖

We’ll be using MySQL for the demontration. Check the manual for this function in other Database Managers.

我們將使用MySQL進行清除。 在其他數(shù)據(jù)庫管理器中查看有關(guān)此功能的手冊。

We’ll drop the view called ?students_dropMe_v , which was created just for this purpose.

我們將刪除名為students_dropMe_v的視圖，該視圖就是為此目的而創(chuàng)建的。

基本語法 (Basic Syntax)

DROP VIEW [IF EXISTS]view_name [, view_name] ...

刪除視圖SQL (Drop View SQL)

The if exists portion will “trap” errors, should the view not exist.

如果該視圖不存在，則如果存在部分將“捕獲”錯誤。

drop view if exists students_dropMe_v;

The view after creation:

創(chuàng)建后的視圖：

使用工作臺 (Using the Workbench)

From the workbench:

在工作臺上：

Right click on the view to drop

右鍵單擊視圖以拖放

select drop view from the menu

從菜單中選擇下拉視圖

Select either either a) run SQL to review the SQL statement to be executed or b) drop new

選擇a)運行SQL以檢查要執(zhí)行SQL語句，或b)刪除新的

*As with all of these SQL things there is MUCH MORE to them than what’s in this introductory guide. I hope this at least gives you enough to get started.

*與所有這些SQL事物一樣，它們比本入門指南中的內(nèi)容要多得多。 我希望這至少能給您足夠的入門。

Please see the manual for your database manager and have fun trying different options yourself.*

請參閱數(shù)據(jù)庫管理員手冊，并嘗試自己嘗試其他選項，以獲取樂趣。*

額外 (Extra)

Here’s the SQL I used to create the table that we just dropped:

這是我用來創(chuàng)建剛剛刪除的表SQL：

create view `students_dropMe_v` as select FullName, programOfStudy from student where programOfStudy = 'Programming';

翻譯自: https://www.freecodecamp.org/news/the-sql-drop-view-statement/

drop sql語句

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