在WHERE子句中具有多个条件的mySQL SUBSTRING

Question

I have this query:

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'))

that gives me this error:

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

The query works if I only use this:

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

Answer 1

According to the MySQL Function Name Parsing there must be no whitespace between the built-In function name ('SUBSTRING' in your case) and the following “(” parenthesis character. It's a default parser behaviour to distinguish whether names of the built-in functions are being used as function calls or as identifiers in nonexpression context.

So if you remove the white space after 'SUBSTRING' function call in the last line, your query will work fine:

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

SUBSTRING和（。）之间没有空格。如果你真的想要，有一个db选项允许它。

Answer 3

You've got an extra space in the final clause:

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

remove that, and the whole query will work.