MySQL的SUBSTRING在WHERE子句

Question

我有這個疑問多個條件：

SELECT DISTINCT phone, department 
FROM `users` 
WHERE ((SUBSTRING(phone,1,3) = '399') 
AND (SUBSTRING(phone,5,4) BETWEEN '3400' AND '3499') 
OR (SUBSTRING(phone,1,3) = '244') 
AND (SUBSTRING (phone,5,4) BETWEEN '5400' AND '5499')) 

，讓我這個錯誤：

#1630 - FUNCTION Database.SUBSTRING does not exist. Check the 'Function Name Parsing and Resolution' section in the Reference Manual

的查詢工作，如果我只能用這個：

SELECT DISTINCT phone, department 
FROM `users` 
WHERE (SUBSTRING(phone,1,3) = '399') 
AND (SUBSTRING(phone,5,4) BETWEEN '3400' AND '3499') 

Answer 1

根據MySQL Function Name Parsing，內置函數名稱（在您的案例中爲'SUBSTRING'）和下面的「（」括號字符）之間不能有空格，這是默認的解析器行爲，用於區分構建的名稱。-in函數被用作函數調用或在nonexpression上下文標識符

所以，如果你刪除的最後一行「SUBSTRING」函數調用之後的空格，您的查詢將正常工作：

SELECT DISTINCT phone, department 
FROM `users` 
WHERE ((SUBSTRING(phone,1,3) = '399') 
AND (SUBSTRING(phone,5,4) BETWEEN '3400' AND '3499') 
OR (SUBSTRING(phone,1,3) = '244') 
AND (SUBSTRING(phone,5,4) BETWEEN '5400' AND '5499')) 

Answer 2

在SUBSTRING和（）之間不能有空格。（有一個db選項如果你真的想要的話。

Answer 3

您在最後的子句中有一個額外的空間：

AND (SUBSTRING (phone,5,4) BETWEEN '5400' AND '5499')) 
       ^---here 

刪除，整個查詢將工作。