# SELECT INTO
#### 功能描述
SELECT INTO用于根据查询结果创建一个新表，并且将查询到的数据插入到新表中。
数据并不返回给客户端，这一点和普通的SELECT不同。新表的字段具有和SELECT的输出字段相同的名字和数据类型。
#### 注意事项
CREATE TABLE AS的作用和SELECT INTO类似，且提供了SELECT INTO所提供功能的超集。建议使用CREATE TABLE AS语法替代SELECT INTO，因为SELECT INTO不能在存储过程中使用并且SELECT INTO字段名，不支持接收空行。
#### 语法格式
```
[ WITH [ RECURSIVE ] with_query [, ...] ]
SELECT [ ALL | DISTINCT [ ON ( expression [, ...] ) ] ]
    { * | {expression [ [ AS ] output_name ]} [, ...] }
    INTO [ [ GLOBAL | LOCAL | VOLATILE ] { TEMPORARY | TEMP } | UNLOGGED ] [ TABLE ] new_table
    [ FROM from_item [, ...] ]
    [ WHERE condition ]
    [ GROUP BY expression [, ...] ]
    [ HAVING condition [, ...] ]
    [ WINDOW {window_name AS ( window_definition )} [, ...] ]
    [ { UNION | INTERSECT | EXCEPT | MINUS } [ ALL | DISTINCT ] select ]
    [ ORDER BY {expression [ [ ASC | DESC | USING operator ] | nlssort_expression_clause ] [ NULLS { FIRST | LAST } ]} [, ...] ]
    [ { [ LIMIT { count | ALL } ] [ OFFSET start [ ROW | ROWS ] ] } | { LIMIT start, { count | ALL } } ]
    [ FETCH { FIRST | NEXT } [ count ] { ROW | ROWS } ONLY ]
    [ {FOR { UPDATE | SHARE } [ OF table_name [, ...] ] [ NOWAIT ]} [...] ];
```
#### 参数说明
**INTO \[ \[ GLOBAL \| LOCAL \| VOLATILE \] { TEMPORARY \| TEMP } \| UNLOGGED \] \[ TABLE \] new_table**
**\[ GLOBAL \| LOCAL \| VOLATILE \] { TEMPORARY \| TEMP }** 指定临时表类型，具体可参考[参数说明](https://support.huaweicloud.com/sqlreference-911-dws/dws_06_0177.html#ZH-CN_TOPIC_0000002166772902__s1a0c1ce222bb46dfb68a016610aea3a5)章节中GLOBAL \| LOCAL \| VOLATILE相关说明。
UNLOGGED指定表为非日志表。写入非日志表中的数据不会写入到预写日志中，这样就会比普通表快很多。但是，非日志表也是不安全的，在冲突或异常关机后会被自动删截。非日志表中的内容也不会被复制到备用服务器中。在该类表中创建的索引也不会被自动记录。
new_table指定新建表的名字。
![](https://support.huaweicloud.com/sqlreference-911-dws/public_sys-resources/note_3.0-zh-cn.png)
SELECT INTO的其它参数可参考SELECT的[SELECT主句参数说明](https://support.huaweicloud.com/sqlreference-911-dws/dws_06_0238.html#ZH-CN_TOPIC_0000002202139365__s3d562432879c4244bcdbfdf9f30bcc5e)。
#### 示例
将reason_t表中TABLE_SK小于3的值加入到新建表中。
```
DROP TABLE IF EXISTS reason_t;
CREATE TABLE reason_t
(
    TABLE_SK          INTEGER               ,
    TABLE_ID          VARCHAR(20)           ,
    TABLE_NA          VARCHAR(20)
);
INSERT INTO reason_t VALUES (1, 'S01', 'StudentA'),(2, 'T01', 'TeacherA'),(3, 'T02', 'TeacherB'),(3, 'S02', 'StudentB');
SELECT * INTO reason_t_bck FROM reason_t WHERE TABLE_SK < 3;
SELECT * FROM reason_t_bck;
```
![](https://support.huaweicloud.com/sqlreference-911-dws/figure/zh-cn_image_0000002587785868.png "点击放大")
#### 相关链接
[SELECT](https://support.huaweicloud.com/sqlreference-911-dws/dws_06_0238.html)