将int转换为varchar [英] Cast int to varchar

问题描述

我有以下查询，需要将 id 转换为 varchar

I have below query and need to cast id to varchar

模式

Schema

create table t9 (id int, name varchar (55));
insert into t9( id, name)values(2, 'bob');

我尝试的

select CAST(id as VARCHAR(50)) as col1 from t9;

select CONVERT(VARCHAR(50),id) as colI1 from t9;

但它们不工作。请建议。

but they don't work. Please suggest.

推荐答案

您需要 cast 或 convert 作为 CHAR 数据类型，没有 varchar 数据类型，您可以将数据转换/转换为：

You will need to cast or convert as a CHAR datatype, there is no varchar datatype that you can cast/convert data to:

select CAST(id as CHAR(50)) as col1 
from t9;

select CONVERT(id, CHAR(50)) as colI1 
from t9;

在 SQL Fiddle ：

/*! Build Schema */
create table t9 (id INT, name VARCHAR(55));
insert into t9 (id, name) values (2, 'bob');

/*! SQL Queries */
select CAST(id as CHAR(50)) as col1 from t9;
select CONVERT(id, CHAR(50)) as colI1 from t9;

除了您试图转换为不正确的数据类型，您用于 convert 的语法不正确。 convert 函数使用以下语句，其中 expr 是您的列或值：

Besides the fact that you were trying to convert to an incorrect datatype, the syntax that you were using for convert was incorrect. The convert function uses the following where expr is your column or value:

 CONVERT(expr,type)

 CONVERT(expr USING transcoding_name)

您的原始查询语法向后。

Your original query had the syntax backwards.

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