Data types in Firebird
| Data type |
Length |
Description |
| SMALLINT |
2 bytes |
Range from -32 768 to 32 767 (unsigned: from 0 to 65 535) |
| INTEGER |
4 bytes |
Range from -2 147 483 648 to +2 147 483 647 (unsigned: from 0 to 4 294 967 295) |
| BIGINT |
8 bytes |
Range from -9 223 372 036 854 775 808 to +9 223 372 036 854 775 807 (unsigned: from 0 to 18 446 744 073 709 551 615) |
| DECIMAL(precision,scale) |
|
Range 1-9 INTEGER (32b), 10-18 BIGINT (64b) |
| NUMERIC(precision,scale) |
|
Range 1-4 SMALLINT (16b, 5-9 INTEGER (32b), 10-18 BIGINT (64b) |
| FLOAT |
|
Range from 1.175 * 10^-38 to 3.402 * 10^38 |
| DOUBLE PRECISION |
|
Range from 2.225 * 10^-308 to 1.797 * 10^308 |
| DATE |
'0000-00-00' |
from 1.1.0001 to 31.12.9999 |
| TIME |
'00:00:00' |
from 0:00:00:0000 to 23:59:59:9999 |
| TIMESTAMP(n) |
'0000-00-00 00:00:00' |
from 1.1.0001 0:00:00:0000 to 31.12.9999 23:59:59:9999 |
| CHAR(n),CHARACTER(n) |
|
a string of fixed length, where n is the number of stored characters. |
| VARCHAR(n), CHARACTER VARYING(n) |
|
strings of variable length, where n is the maximum number of characters in the string. |
| BLOB |
|
large data of variable length, binary data or very large texts |
precision – (Range) The total number or maximum number of valid digits, also decimal, that can be stored in the column of such type. Range is from 1 to 18.
scale – (Precision) represents the number of decimal places. The precision is in the range from 0 to defined range (the precision must be less then or equal to range).
See
http://firebirdsql.org/manual/migration-mssql-data-types.html.