SelectDB Cloud
SQL 手册
函数
CAST

CAST

description

Syntax

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
mysql> select cast (1 as BIGINT);
+-------------------+
| CAST(1 AS BIGINT) |
+-------------------+
|                 1 |
+-------------------+
  1. 转导入的原始数据
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:

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

mysql> select cast(cast ("11.2" as double) as bigint);
+----------------------------------------+
| CAST(CAST('11.2' AS DOUBLE) AS BIGINT) |
+----------------------------------------+
|                                     11 |
+----------------------------------------+
1 row in set (0.00 sec)

keywords

CAST

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