Name: SQL - SELECT 語句 - W3Schools.com (SQL - SELECT Statement - W3Schools.com)
Uploaded: 2024-11-19T15:44:24.000Z
Duration: 1 min 29 s

Think of it as your trusty tool for picking data out of a database, like choosing your favorite candies from a jar. So let's get started.

把它想象成你從數據庫中挑選數據的可靠工具，就像從罐子裡挑選你最喜歡的糖果一樣。讓我們開始吧。

The SELECT statement is used to grab data from a database.

SELECT 語句用於從數據庫中抓取數據。

This code tells the database, "Hey, give me the customer name and city columns from the customers table." But how do we write this in a general form?

這段代碼告訴數據庫："嘿，給我客戶表中的客戶名稱和城市列"。但我們該如何以一般形式編寫呢？

Column 1, column 2, etc. are the columns you want, and table name is the table you're getting them from. Now let's look at our demo database, the customers table.

列 1、列 2 等是你想要的列，表名是從表中獲取的。現在讓我們看看演示數據庫中的客戶表。

Let's do our SELECT statement from earlier: "SELECT customer name and city from customers." Pretty cool, right? But what if we want to see everything in the table?

讓我們執行之前的 SELECT 語句："SELECT customer name and city from customers"。很酷吧？但如果我們想查看錶中的所有內容呢？

我們使用星形通配符，就像這樣。

This tells the database, "Show me all the columns," and you get the whole shebang! And that's the basics of the SQL SELECT statement.

這會告訴數據庫："給我顯示所有列"，然後你就能得到全部內容！這就是 SQL SELECT 語句的基本原理。

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點贊和訂閱可獲得我們的最新視頻通知。

For more coding tips and tricks, keep it locked right here on w3schools.com.

更多編碼技巧和竅門，請鎖定 w3schools.com。

Don't forget to try out what you've learned in our interactive editor.

別忘了在我們的互動編輯器中嘗試您所學到的知識。

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SQL - SELECT 語句 - W3Schools.com (SQL - SELECT Statement - W3Schools.com)

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