CAST

description

Syntax

  1. cast (input as type)

BIGINT type

Syntax(BIGINT)

cast (input as BIGINT)

将 input 转成 指定的 type

将当前列 input 转换为 BIGINT 类型

example

  1. 转常量，或表中某列
  1. mysql> select cast (1 as BIGINT);
  2. +-------------------+
  3. | CAST(1 AS BIGINT) |
  4. +-------------------+
  5. |                 1 |
  6. +-------------------+
  1. 转导入的原始数据
  1. curl --location-trusted -u root: -T ~/user_data/bigint -H "columns: tmp_k1, k1=cast(tmp_k1 as BIGINT)"  http://host:port/api/test/bigint/_stream_load

注：在导入中，由于原始类型均为String，将值为浮点的原始数据做 cast的时候数据会被转换成 NULL ，比如 12.0 。Doris目前不会对原始数据做截断。

如果想强制将这种类型的原始数据 cast to int 的话。请看下面写法：

  1. curl --location-trusted -u root: -T ~/user_data/bigint -H "columns: tmp_k1, k1=cast(cast(tmp_k1 as DOUBLE) as BIGINT)"  http://host:port/api/test/bigint/_stream_load
  3. mysql> select cast(cast ("11.2" as double) as bigint);
  4. +----------------------------------------+
  5. | CAST(CAST('11.2' AS DOUBLE) AS BIGINT) |
  6. +----------------------------------------+
  7. |                                     11 |
  8. +----------------------------------------+
  9. 1 row in set (0.00 sec)

keyword

CAST