Am 16.08.2012 00:28, Jay Lozier wrote:
varchar(60) is a text string up to 60 characters long. I believe the
actual memory usage is based the number of characters in the string
char(15) is a text string up to 15 characters long but enough memory is
always used for 15 characters.
The length of varchar and char can be set to other lengths.
Then there is VARCHAR_IGNORECASE which is very useful It enforces case
sensitivity on field level.
integer is an integer only and can be positive or negative. I did not
look up the range for Base (-minint to +maxint).
Base uses the specification of the respective database.
For the embedded HSQL that is:
TINYINT is not negative between 0 and 255 (1 byte, 2^8)
numeric and decimal are floating point numbers of varying precision and
size. You can specify the number of decimal places as well as the size
of the number (decimal(10,2) has 10 total places with two decimal
places) .Some db's use decimal for currency, I am not sure what the
advantage of numeric versus the other floating numbers such as float and
The floating point numbers give you the same advantages and
disadvantages as in spreadsheets which use the "Double" type for
everything (64 bit, up to 15 free floating decimal digits). You have a
flexible free floating translation between the stored bits and decimal
figures. On the other hand you have rounding errors which make
spreadsheets inadequate for accounting unless you have the skills to
apply rounding without losing significant data.
I mostly use MariaDB which does not have the numeric type
explicitly available. Again you have both positive and negative values.
I believe numeric is the full possible range while decimal is restricted
by its initial definition.
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