Question

如何使用类似

的min-width语句

case

没有抛出转换错误？我正在处理的列是CASE WHEN val IS STRING THEN something WHEN val > 0 THEN something，但它将包含“NO VALUE”或数字。

Answer 1

这个怎么样......这有帮助

DECLARE @VAL VARCHAR(8)

SELECT @VAL = COLUMNNAME1 FROM TABLENAME1 WHERE SOMEOTHERCOL2 = SOMEVALUE;

SELECT 
CASE 
WHEN @VAL = 'NO VALUE' THEN NULL
    WHEN CAST(@VAL AS BIGINT) > 0 THEN @VAL
    ELSE 'LT 1'
END
FROM TABLE 
WHERE COLUMNNAME1 = SOMEVALUE

Answer 2

首先使用CASE＆CAST＆＃39;然后过滤掉导致异常的值。请记住，如果某些字符串不是＆＃39; NO VALUE＆＃39;

，这仍然会失败

SELECT CASE(so.val)
WHEN 'NO VALUE'
THEN null
ELSE CAST(so.val AS int)
END from dbo.SO41270497 so

Answer 3

尝试：

DECLARE @myTable TABLE (Val varchar(10))
INSERT INTO @myTable VALUES ('No Value'),('1'),('2'),('3'),('4'),('5')
SELECT * FROM @myTable
SELECT CASE WHEN ISNUMERIC(Val) = 1 THEN CONVERT(int,Val) ELSE NULL END 
AS Val FROM @myTable

关于SQL Server中混合值的USE案例声明

3 个答案: