MySQL error: key specification without a key length

Question

I have a table with a primary key that is a varchar(255). Some cases have arisen where 255 characters isn\'t enough. I tried changing the field to a text, but I get the foll

Answer 1

The solution to the problem is that in your CREATE TABLE statement, you may add the constraint UNIQUE ( problemtextfield(300) ) after the column create definitions to specify a key length of 300 characters for a TEXT field, for example. Then the first 300 characters of the problemtextfield TEXT field would need to be unique, and any differences after that would be disregarded.