时间：2021-07-01 10:21:17 帮助过：22人阅读
| Type {storage} | Name | Range | Attributes | Default |
|---|---|---|---|---|
| Numeric {1 byte} | TINYINT[(M)] | -128 TO 127 [0 to 255 if UNSIGNED] | AUTO_INCREMENT UNSIGNED, ZEROFILL, SERIAL DEFAULT VALUE | NULL [0 if NOT NULL] |
| Numeric {2 bytes} | SMALLINT[(M)] | -32,768 to 32,767 [0 to 65,535] | AUTO_INCREMENT, UNSIGNED, ZEROFILL, SERIAL DEFAULT VALUE | NULL [0 if NOT NULL] |
| Numeric {3 bytes} | MEDIUMINT[(M)] | -8,388,608 to 8,388,607 [0 to 16,777,215] | AUTO_INCREMENT, UNSIGNED, ZEROFILL, SERIAL DEFAULT VALUE | NULL [0 if NOT NULL] |
| Numeric {4 bytes} | INT[(M)] | -/+2.147E+9 [0 to 4.294E+9] | AUTO_INCREMENT, UNSIGNED, ZEROFILL, SERIAL DEFAULT VALUE | NULL [0 if NOT NULL] |
| Numeric {8 bytes} | BIGINT[(M)] | -/+9.223E+18 [0 to 18.45E+18] | AUTO_INCREMENT, UNSIGNED, ZEROFILL, SERIAL DEFAULT VALUE | NULL [0 if NOT NULL] |
| Numeric {4 or 8} | FLOAT(p) | p=0-24 --> "FLOAT" p=25-53 --> "DOUBLE" | UNSIGNED, ZEROFILL | NULL [0 if NOT NULL] |
| Numeric {4 bytes} | FLOAT[(M,D)] | Min=+/-1.175E-38 Max=+/-3.403E+38 | UNSIGNED, ZEROFILL | NULL [0 if NOT NULL] |
| Numeric {8 bytes} | DOUBLE[(M,D)] | Min=+/-2.225E-308 Max=+/-1.798E+308 | UNSIGNED, ZEROFILL | NULL [0 if NOT NULL] |
| Numeric {M+2} | DECIMAL[(M,[D])] Stored as string | Max Range = DOUBLE range Fixed point vs. DOUBLE float | UNSIGNED, ZEROFILL | NULL [0 if NOT NULL] |
| Bit {8 bytes} | BIT[(M)] | Binary. Display by [add zero or converting with BIN()]. M=1-64 | Prior to 5.03 TINYINT(1) Synonym | NULL [0 if NOT NULL] |
| String {M char's} | CHAR[(M)] | M=0-255 Characters, FIXED. Right padded with spaces. | BINARY, CHARACTER SET | NULL ["" if NOT NULL] |
| String {M char's1} | VARCHAR(M) | M=0-65,535 Characters M=0-255 BINARY, CHARACTER SET | NULL | ["" if NOT NULL] |
| String {#char's1} | TINYTEXT2 | 0-255 Characters | BINARY, CHARACTER SET | NULL ["" if NOT NULL] |
| String {#char's1} | TEXT2 | 0-65,535 Char's | BINARY, CHARACTER SET | NULL ["" if NOT NULL] |
| String {#char's1} | MEDIUMTEXT2 | 0-16,777,215 Char's | BINARY, CHARACTER SET | NULL ["" if NOT NULL] |
| String {#char's1} | LONGTEXT2 | 0-4,294,967,295 Char's | BINARY, CHARACTER SET | NULL ["" if NOT NULL] |
| String {M bytes} | BINARY[(M)] | M=0-255 bytes, FIXED. | Global Only (case sensitive) | NULL ["" if NOT NULL] |
| String {M bytes} | VARBINARY(M) | 0-65,535 bytes M=0-255 Global Only | (case sensitive) NULL | ["" if NOT NULL] |
| String {#bytes1} | TINYBLOB | 0-255 bytes | Global Only (case sensitive) | NULL ["" if NOT NULL] |
| String {#bytes1} | BLOB | 0-65,535 bytes | Global Only (case sensitive) | NULL ["" if NOT NULL] |
| String {#bytes1} | MEDIUMBLOB | 0-16,777,215 bytes | Global Only (case sensitive) | NULL ["" if NOT NULL] |
| String {#bytes1} | LONGBLOB | 0-4,294,967,295 bytes | Global Only (case sensitive) | NULL ["" if NOT NULL] |
| String {1-2 bytes} | ENUM2 ("A1","A2",...) | Column is exactly 1 of 1-65,535 values | CHARACTER SET | NULL [1st value if NOT NULL] |
| String {1-8 bytes} | SET2 ("A1","A2",...) | Column is 0 or more values in list of 1-64 members | CHARACTER SET | NULL ["" if NOT NULL] |
| Date & Time {3 bytes} | DATE | "1000-01-01" - "9999-12-31" | Global Only (YYYY-MM-DD) | NULL ["0000-00-00" if NOT NULL] |
| Date & Time {8 bytes} | DATETIME | "1000-01-01 00:00:00" - "9999-12-31 23:59:59" | Global Only (YYYY-MM-DD hh:mm:ss) | NULL ["0000-00-00 00:00:00" if NOT NULL] |
| Date & Time {3 bytes} | TIME | "-838:59:59" - "838:59:59" | Global Only (hh:mm:ss) | NULL ["00:00:00" if NOT NULL] |
| Date & Time {4 bytes} | TIMESTAMP | 19700101000000 - 2037+ | Global Only (YYYYMMDDhhmmss) | Current Date & Time |
| Date & Time {1 bytes} | YEAR | 1900 - 2155 | Global Only (YYYY) | NULL ["0000" if NOT NULL] |
Notes: