Question

我正在尝试使用+符号连接几个字符串...当我使用concat函数时它工作正常但是当我使用'+'符号连接字符串时会抛出错误。

任何人都知道为什么会出现这个问题？下面是使用concat的代码，它工作正常

    Begin
    DECLARE @VAR1 AS VARCHAR(60)
    SET @VAR1 = concat ((SELECT MIN(TimeDimension_Year) FROM TimeDimension_LU WHERE TimeDimension_TimeDimensionType_ID = 15), '-','current quarter')
    SELECT @VAR1
    end

下面的

是使用'+'符号的相同代码但是失败

    Begin
    DECLARE @VAR1 AS VARCHAR(60)
    SET @VAR1 = (SELECT MIN(TimeDimension_Year) FROM TimeDimension_LU WHERE TimeDimension_TimeDimensionType_ID = 15)+ '-'+'current quarter'
    SELECT @VAR1
    end

Answer 1

显然某事不是字符串。这将是SET @VAR1 = (SELECT CAST(MIN(TimeDimension_Year) as varchar(255)) FROM TimeDimension_LU WHERE TimeDimension_TimeDimensionType_ID = 15 ) + '-' + 'current quarter';列。所以：

SELECT @VAR1 = CAST(MIN(TimeDimension_Year) as varchar(255)) + '-' + 'current quarter'
FROM TimeDimension_LU
WHERE TimeDimension_TimeDimensionType_ID = 15;

这对我的口味来说有点冗长。我会选择：

@locations = Location.near(current_user.location, 250) + Location.where(is_remote: true)

使用'+'符号连接会给出错误“将varchar值'当前季度'转换为数据类型int时转换失败。”

1 个答案: