Question

我正在尝试抓取信息以发送到Google Charts的图表我正在查看Active列，该列可以是true / false但在我的数据库中设置为varchar。

使用此查询：

SELECT
    SUM(CASE WHEN CONVERT(int, Active) Active = 1 THEN 1 ELSE 0 END) AS Active,
    SUM(CASE WHEN CONVERT(int, Active) Active = 0 THEN 1 ELSE 0 END) AS Inactive
FROM 
    Events

抛出此错误：

将varchar值'True'转换为数据类型int。
时转换失败

Answer 1

Ints不是布尔值......它们在SQL Server中被称为位。尝试;

SELECT
SUM(CASE WHEN CONVERT(bit, Active) = 1 THEN 1 ELSE 0 END) AS Active,
SUM(CASE WHEN CONVERT(bit, Active) = 0 THEN 1 ELSE 0 END) AS Inactive
FROM Events

或者只测试你的String

SELECT
SUM(CASE WHEN Active = 'True' THEN 1 ELSE 0 END) AS Active,
SUM(CASE WHEN Active = 'False' THEN 1 ELSE 0 END) AS Inactive
FROM Events

P.S。将布尔值存储为String列是愚蠢的...考虑将列更改为位列，这样您甚至不需要转换它

在varchar列上使用CASE的转换错误

1 个答案: