這個SQL有什麼問題？

Question

我花了好幾個小時試圖解決這個問題。

SELECT * 
FROM `users` 
WHERE `IP` = `123.231.213.132` 

這是什麼問題？

#1054 - Unknown column '123.231.213.132' in 'where clause' 

Answer 1

您不應該使用帶列值的反引號。您必須使用單引號或雙引號，否則mysql會將該值視爲列名稱。

SELECT * 
FROM `users` 
WHERE `IP` = '123.231.213.132' 

Answer 2

使用單引號，而不是反引號字符`123.231.213.132``

SELECT * 
FROM `users` 
WHERE `IP` = '123.231.213.132' 

Answer 3

It might be the single speach mark symbol. Try replacing them manually.

Answer 4

Use quotes ' not backticks ` for string literals

Answer 5

What's with the backticks? Use single quotes Also I'm assuming that users is a table name and IP is an entity of users.

Also...you have to end your statement with a semi-colon

Answer 6

you are using wrong quotation characters

to specify string value in mysql statement you have to use either '(single quote) or "(double quote)

`(backtick) characters are used to explicitly specify that quoted string represents a field name from where mysql should get the data

backticks are required in your statements if column names are conflicting with mysql's reserved keywords like index，where等