问题
I have a table that has column names like 25, 50, 100, etc..
When trying to update the table I get an error, no matter how I do it
UPDATE table SET \'25\'=\'100\' WHERE id = \'1\'
I have tried quoting and backticking every which way but without success.
The error is always along the lines of:
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near \'\'25\'=100 WHERE id=1\' at line 1
If I change the column name to twentyfive - I don\'t have a problem, but that\'s not what I want. Is it possible to use a number as a column name?
回答1:
From the docs:
Identifiers may begin with a digit but unless quoted may not consist solely of digits.
Which means you must quote it with back ticks like `25`:
UPDATE table SET `25`='100' WHERE id='1'
回答2:
As others have said, you can back-tick the names of tables, columns, etc. Just make sure you're not back-ticking your values otherwise it'll interpret them as column names. So in your example only the 25 needs to be back ticked:
UPDATE table SET `25`=100 WHERE id=1
回答3:
Check here: http://dev.mysql.com/doc/refman/5.0/en/identifiers.html
Identifiers may begin with a digit but unless quoted may not consist solely of digits.
So yes, you can do it -- you need to use backtics around the name.
回答4:
If you need it to be based on a number for some reason, you can append some simple prefix to the number in all cases (e.g. "col25", "col87", etc).
回答5:
Names in MySQL can start with a digit, but cannot be entirely digits — they cannot be confusable with an integer. So, no.
And if you start your identifier with a digit, you should be pretty sure you're sticking with MySQL because many (most?) other database engines require an alpha character at the front of column names.
(As stated in the comments, a fully integer column name is allowed if you consistently use the backtick character — if you tried backticks and still got a syntax error, post the precise backtick syntax you used).
Also, of course, you're going to produce some difficult to read SQL if you opt for integer-named columns!
来源：https://stackoverflow.com/questions/7975417/can-a-number-be-used-to-name-a-mysql-table-column