什麼時候在MySQL中使用單引號，雙引號和反引號 - When to use single quotes, double quotes, and backticks in MySQL

問題：

I am trying to learn the best way to write queries. 我正在嘗試學習編寫查詢的最佳方法。 I also understand the importance of being consistent. 我也瞭解保持一致的重要性。 Until now, I have randomly used single quotes, double quotes, and backticks without any real thought. 到如今爲止，我在沒有任何實際考慮的狀況下隨機使用單引號，雙引號和反引號。

Example: 例：

$query = 'INSERT INTO table (id, col1, col2) VALUES (NULL, val1, val2)';

Also, in the above example, consider that table , col1 , val1 , etc. may be variables. 另外，在上面的示例中，請考慮table ， col1 ， val1等能夠是變量。

What is the standard for this? 這是什麼標準？ What do you do? 你是作什麼？

_{I've been reading answers to similar questions on here for about 20 minutes, but it seems like there is no definitive answer to this question. 我已經在這裏閱讀了大約20分鐘的相似問題的答案，可是彷佛沒有確切的答案。}

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解決方案：

參考一： https://stackoom.com/question/lVEh/什麼時候在MySQL中使用單引號-雙引號和反引號
參考二： https://oldbug.net/q/lVEh/When-to-use-single-quotes-double-quotes-and-backticks-in-MySQL