alter - Is it ALWAYS transparent to increase the size of a MYSQL column? -


it appears me if make column larger (i.e. varchar(255) varchar(512)) these kinds of changes transparent.

  1. existing data in column identical, ,
  2. selects , other mysql statement work same in either case, , require no changes?

it's valid assumption? i'm make field larger has data in (with alter) , want sure after change, things function , appear (except after, can push in larger fields).

data remain same if column made larger (e.g. varchar(100) varchar(200)).

queries, such selects should work expected, should consider relationships field has others, internally , externally.

  • is field displayed in external application set handle displaying n characters , expected handle n+x characters?

  • is field input query or procedure expecting field of length n not able handle length n+x?


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