时间：2021-07-01 10:21:17 帮助过：246人阅读
上次工作需要学了一个月的mysql，不久知道好多东西都忘掉了，现在由于工作需要再学点sqlite，其实都差不多,Sqlite3支持的数据类型
上次工作需要学了一个月的mysql，不久知道好多东西都忘掉了，现在由于工作需要再学点sqlite，其实都差不多,Sqlite3支持的数据类型
NULL，INTEGER，REAL，TEXT，BLOB
timestamp 包含了 年、月、日、时、分、秒、千分之一秒。
表1-1
type description
TINYBLOB, BLOB, MEDIUMBLOB, LONGBLOB, BYTEA String types of unlimited length. Binary data must be safely encoded, see text.
CHAR(), VARCHAR(), TINYTEXT, TEXT, MEDIUMTEXT, LONGTEXT String types of unlimited length. There is no chopping or padding performed by the database engine.
ENUM String type of unlimited length. In contrast to MySQL, choosing ENUM over VARCHAR does not save any storage space.
SET String type of unlimited length. In contrast to MySQL, the input is not checked against the list of allowed values.
YEAR String type of unlimited length. MySQL stores 2 or 4 digit years as a 1 byte value, whereas the SQLite drivers stores the string as provided.
TINYINT, INT1, CHAR A 1 byte type used to store one character, a signed integer between -128 and 127, or an unsigned integer between 0 and 255.
SMALLINT, INT2 2 byte (short) integer type used to store a signed integer between -32768 and 32767 or an unsigned integer between 0 and 65535.
MEDIUMINT 3 byte integer type used to store a signed integer between -8388608 and 8388607 or an unsigned integer between 0 and 16777215.
INT, INTEGER, INT4 4 byte (long) integer type used to store a signed integer between -2147483648 and 2147483647 or an unsigned integer between 0 and 4294967295.
BIGINT, INT8, INTEGER PRIMARY KEY 8 byte (long long) integer type used to store a signed integer between -9223372036854775808 and 9223372036854775807 or an unsigned integer between 0 and 18446744073709551615. See below for a discussion of INTEGER PRIMARY KEY.
DECIMAL, NUMERIC A string type of unlimited length used to store floating-point numbers of arbitrary precision.
TIMESTAMP, DATETIME A string type of unlimited length used to store date/time combinations. The required format is 'YYYY-MM-DD HH:MM:SS', anything following this pattern is ignored.
DATE A string type of unlimited length used to store a date. The required format is 'YYYY-MM-DD', anything following this pattern is ignored.
TIME A string type of unlimited length used to store a time. The required format is 'HH:MM:SS', anything following this pattern is ignored.
FLOAT, FLOAT4, REAL A 4 byte floating-point number. The range is -3.402823466E+38 to -1.175494351E-38, 0, and 1.175494351E-38 to 3.402823466E+38. Please note that MySQL treats REAL as an 8 byte instead of a 4 byte float like PostgreSQL.
DOUBLE, DOUBLE PRECISION, FLOAT8 An 8 byte floating-point number. The range is -1.7976931348623157E+308 to -2.2250738585072014E-308, 0, and 2.2250738585072014E-308 to 1.7976931348623157E+308.
