On Mon, Jan 5, 2009 at 14:05, Frank Stanovcak <blindspot...@comcast.net> wrote:
> It's been a while since I've programed (VB was on version 4) I was wondering
> if any one could tell me what the diff is between char, varchar, and text in
> mysql.
> I know this isn't a mysql news group, but since I am using php for the
> interaction it seemed like the place to ask. Thanks in advance, and have a
> great day!
This doesn't explain it all, of course, but the most basic explanation is:
CHAR(n) Uses n bytes regardless of length of data
inserted[^1]
VARCHAR(n) Uses strlen+1 bytes[^2]
TEXT Uses the highest amount of minimum bytes,
even for empty[^3]
1: Quick SELECT/INSERT/UPDATE; requires (n) length; maxlength is
255; wastes space.
2: Slow SELECT/INSERT/UPDATE; requires (n) length; maxlength is
65535; doesn't waste space.[^4]
3: Moderate SELECT/INSERT/UPDATE; doesn't require (n); maxlength
is 65535; wastes space.[^5][^6]
4: VARCHAR is further limited to the maximum row size of 65535.
5: TEXT maxlength per column is 65535, but can have multiple
>=65535 columns on same row.
6: TEXT includes four subcategories: TINYTEXT, TEXT, MEDIUMTEXT,
and LONGTEXT.
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</Daniel P. Brown>
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