Sql datatypes
From wikinotes
TODO:
is this all SQL? or is this MySQL specific?
| Integers | |
|---|---|
UNIQUE |
I need to lookup how this works. IMPORTANT |
BOOL |
(alias TRUE/FALSE to TINYINT) |
TINYINT |
int (-128 to 127) |
SMALLINT |
int (-32768 to 32767) |
MEDIUMINT |
int (-8388608 to 8388607) |
INT |
int (-2147483648 to 2147483647) |
BIGINT |
int (-9223372036854775808 to 9223372036854775807) |
| Float & Double | |
FLOAT |
float (a very big number in scientific notation) |
DOUBLE |
double (an even bigger number in scientific notation) |
| Dates | |
DATE |
2014-01-01 |
DATETIME |
2014-01-01 12:30:00 |
TIMESTAMP |
1970-01-01 00:00:01 (seconds since UNIX EPOCH) |
| Strings | |
CHAR(4) |
store limited number of characters. byte size is equivalent to number of characters (maxLength 254) |
VARCHAR(4) |
store limited number of characters. byte size only as large as needs to be (note that 1-2 bytes are used to store byte size) (maxLength 254) |
BINARY(4) |
store limited number of binary characters. byte size is equivalent to number of characters (maxLength 254) |
VARBINARY(4) |
store limited number of binary characters. Binary version of VARCHAR. (maxLength 254) |
TINYBLOB/TINYTEXT |
Binary/String (maxLength 256 chars) |
BLOB/TEXT |
Binary/String (maxLength 65536 chars) |
MEDIUMBLOB/MEDIUMTEXT |
Binary/String (maxLength 16777216 chars) |
LONGBLOB/LONGTEXT |
Binary/String (maxLength 4294967296 chars) |
