BIGINT
Contents
Syntax
BIGINT[(M)] [SIGNED | UNSIGNED | ZEROFILL]
Description
A large integer. The signed range is -9223372036854775808 to
9223372036854775807. The unsigned range is 0 to
18446744073709551615.
If a column has been set to ZEROFILL, all values will be prepended by zeros so that the BIGINT value contains a number of M digits.
Note: If the ZEROFILL attribute has been specified, the column will automatically become UNSIGNED.
For more details on the attributes, see Numeric Data Type Overview.
SERIAL is an alias for:
BIGINT UNSIGNED NOT NULL AUTO_INCREMENT UNIQUE
INT8 is a synonym for BIGINT.
EXAMPLES
With strict_mode set
CREATE TABLE bigints (a BIGINT,b BIGINT UNSIGNED,c BIGINT ZEROFILL); INSERT INTO bigints VALUES (-10,-10,-10); ERROR 1264 (22003): Out of range value for column 'b' at row 1 INSERT INTO bigints VALUES (-10,10,-10); ERROR 1264 (22003): Out of range value for column 'c' at row 1 INSERT INTO bigints VALUES (-10,10,10); INSERT INTO bigints VALUES (9223372036854775808,9223372036854775808,9223372036854775808); ERROR 1264 (22003): Out of range value for column 'a' at row 1 INSERT INTO bigints VALUES (9223372036854775807,9223372036854775808,9223372036854775808); SELECT * FROM bigints; +---------------------+---------------------+----------------------+ | a | b | c | +---------------------+---------------------+----------------------+ | -10 | 10 | 00000000000000000010 | | 9223372036854775807 | 9223372036854775808 | 09223372036854775808 | +---------------------+---------------------+----------------------+
SIGNED and UNSIGNED
The BIGINT data type may be SIGNED (allowing negative values) or UNSIGNED (not allowing negative values).
Example of BIGINT SIGNED (the default):
CREATE TABLE bigint_signed_example ( description VARCHAR(20), example BIGINT SIGNED );
INSERT INTO bigint_signed_example VALUES
('Zero', 0),
('Forty-Two', 42),
('Minimum', -9223372036854775808),
('Maximum', 9223372036854775807);
Example of BIGINT UNSIGNED:
CREATE TABLE bigint_unsigned_example ( description VARCHAR(20), example BIGINT UNSIGNED );
INSERT INTO bigint_unsigned_example VALUES
('Zero', 0),
('Forty-Two', 42),
('Minimum', 0),
('Maximum', 18446744073709551615);
Out-of-Range
A value is considered "out-of-range" when it is too small or too large to be stored in a data type. When sql_mode=STRICT_TRANS_TABLES (the default) is set, an out-of-range value generates an error. If strict mode is not in effect, the value is rounded to the nearest valid value and a warning is generated (which might be hidden, depending on your warning settings).
An example of non-strict out-of-range behavior:
TRUNCATE bigint_signed_example;
-- Disable strict mode or the inserts will fail
SET sql_mode=(SELECT REPLACE(@@sql_mode, 'STRICT_TRANS_TABLES', ''));
INSERT INTO bigint_signed_example VALUES
('Underflow', -9223372036854775809),
('Overflow', 9223372036854775808);
Warning (Code 1264): Out of range value for column 'example' at row 1
Warning (Code 1264): Out of range value for column 'example' at row 2
SELECT * FROM bigint_signed_example;
+-------------+----------------------+
| description | example |
+-------------+----------------------+
| Underflow | -9223372036854775808 |
| Overflow | 9223372036854775807 |
+-------------+----------------------+
TRUNCATE bigint_unsigned_example;
-- Disable strict mode or the inserts will fail
SET sql_mode=(SELECT REPLACE(@@sql_mode, 'STRICT_TRANS_TABLES', ''));
INSERT INTO bigint_unsigned_example VALUES
('Underflow', -1),
('Overflow', 18446744073709551616);
Warning (Code 1264): Out of range value for column 'example' at row 1
Warning (Code 1264): Out of range value for column 'example' at row 2
SELECT * FROM bigint_unsigned_example;
+-------------+----------------------+
| description | example |
+-------------+----------------------+
| Underflow | 0 |
| Overflow | 18446744073709551615 |
+-------------+----------------------+
BIGINT ZEROFILL
A special type of BIGINT UNSIGNED is BIGINT ZEROFILL, which pads out the values with leading zeros in SELECT results. The number of leading zeros are just enough to pad the field out to the length of the type's maximum unsigned value, but the zeros are not included in an expression result or in a UNION SELECT column.
Using BIGINT ZEROFILL works the same way as BIGINT UNSIGNED for most operations except a simple SELECT. For example, with the following test table setup:
CREATE TABLE bigint_zerofill_example (
description VARCHAR(20),
example BIGINT ZEROFILL
);
INSERT INTO bigint_zerofill_example VALUES
('Zero', 0),
('Forty-Two', 42),
('Minimum', 0),
('Maximum', 18446744073709551615);
-- Turn off strict mode or the inserts will fail
SET sql_mode=(SELECT REPLACE(@@sql_mode, 'STRICT_TRANS_TABLES', ''));
INSERT INTO bigint_zerofill_example VALUES
('Underflow', -1),
('Overflow', 18446744073709551616);
Warning (Code 1264): Out of range value for column 'example' at row 1
Warning (Code 1264): Out of range value for column 'example' at row 2
The resulting data would look like this:
SELECT *, example + 0 FROM bigint_zerofill_example; +-------------+----------------------+----------------------+ | description | example | example + 0 | +-------------+----------------------+----------------------+ | Zero | 00000000000000000000 | 0 | | Forty-Two | 00000000000000000042 | 42 | | Minimum | 00000000000000000000 | 0 | | Maximum | 18446744073709551615 | 18446744073709551615 | | Underflow | 00000000000000000000 | 0 | | Overflow | 18446744073709551615 | 18446744073709551615 | +-------------+----------------------+----------------------+
