# 数据类型示例
<a name="data-types-examples"></a>

下表列示了 DML 数据类型的示例文字。


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| 数据类型 | 示例 | 
| --- | --- | 
| BOOLEAN |  `true` `false `  | 
| TINYINT |  `TINYINT '123'`  | 
| SMALLINT |  `SMALLINT '123'`  | 
| INT，INTEGER |  `123456790`  | 
| BIGINT |  `BIGINT '1234567890'` `2147483648`  | 
| REAL |  `'123456.78'`  | 
| DOUBLE |  `1.234`  | 
| DECIMAL(precision, scale) |  `DECIMAL '123.456'`  | 
| CHAR、CHAR(length) |  `CHAR 'hello world'`, `CHAR 'hello ''world''!'`  | 
| VARCHAR、VARCHAR(length) |  `VARCHAR 'hello world'`, `VARCHAR 'hello ''world''!'`  | 
| VARBINARY |  `X'00 01 02'`  | 
| TIME、TIME(precision) |  `TIME '10:11:12'`, `TIME '10:11:12.345'`  | 
| 带时区的时间 |  `TIME '10:11:12.345 -06:00'`  | 
| DATE |  `DATE '2024-03-25'`  | 
|  TIMESTAMP、TIMESTAMP WITHOUT TIME ZONE、TIMESTAMP(*precision*)、TIMESTAMP(*precision*) WITHOUT TIME ZONE   |  `TIMESTAMP '2024-03-25 11:12:13'`, `TIMESTAMP '2024-03-25 11:12:13.456'`  | 
| TIMESTAMP WITH TIME ZONE、TIMESTAMP(precision) WITH TIME ZONE |  `TIMESTAMP '2024-03-25 11:12:13.456 Europe/Berlin'`  | 
| INTERVAL YEAR TO MONTH |  `INTERVAL '3' MONTH`  | 
| INTERVAL DAY TO SECOND |  `INTERVAL '2' DAY`  | 
| ARRAY[element\$1type] |  `ARRAY['one', 'two', 'three']`  | 
| MAP(key\$1type, value\$1type) |  `MAP(ARRAY['one', 'two', 'three'], ARRAY[1, 2, 3])` 请注意，映射根据键的数组和值的数组创建。以下示例将创建将字符串映射到整数的表。 <pre>CREATE TABLE map_table(col1 map<string, integer>) LOCATION '...';<br />INSERT INTO map_table values(MAP(ARRAY['foo', 'bar'], ARRAY[1, 2]));</pre>  | 
| ROW(field\$1name\$11 field\$1type\$11, field\$1name\$12 field\$1type\$12, …) |  `ROW('one', 'two', 'three')` 请注意，以这种方式创建的行并无列名。要添加列名，可以使用 `CAST`，如下例所示： <pre>CAST(ROW(1, 2, 3) AS ROW(one INT, two INT, three INT))</pre>  | 
| JSON |  `JSON '{"one":1, "two": 2, "three": 3}'`  | 
| UUID |  `UUID '12345678-90ab-cdef-1234-567890abcdef'`  | 
| IPADDRESS |  `IPADDRESS '10.0.0.1'` `IPADDRESS '2001:db8::1'`  |