Many people say to me that set VARCHAR(100) doesnt make sense. It the same as put 255. I’d like to know why…
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Many people say to me that set VARCHAR(100) doesnt make sense. It the same as put 255. I’d like to know why…
That’s rubbish. They may be talking about the fact that a
varcharuses one byte for the length regardless of whether the maximum length is 100 or 255 ( lengths above that will use two bytes, up to ~64K) but they are treated differently.If you insert a 150-character string into the former, it will be truncated to 100, that’s not so for the latter case.
You should use the length that makes sense. If you have a column that will never exceed 30 characters, don’t use
varchar(255).See here for the type details.