varchar 中只能取数字字符的查询？

Question

我有一列

GL_DESCRIPTION

，其中有这样的值

select distinct GL_DESCRIPTION FROM database_actual_pemupukan;

PEMUPUKAN - CPD HIK ROTASI 3 EMDEK - TRANSPORT
PEMUPUKAN - CPD HIK ROTASI 2 EMDEK - UPAH
PEMUPUKAN - CPD HIK ROTASI 2  - MATERIAL
PEMUPUKAN - CPD HIK ROTASI 1  - TRANSPORT
PEMUPUKAN - CPD HIK ROTASI 3  - MATERIAL
PEMUPUKAN - CPD HIK ROTASI 1  - MATERIAL
PEMUPUKAN - CPD HIK ROTASI 2 EMDEK - MATERIAL
PEMUPUKAN - CPD HIK ROTASI 3 EMDEK - MATERIAL
PEMUPUKAN - CPD HIK ROTASI 1 EMDEK - MATERIAL
PEMUPUKAN - CPD HIK ROTASI 1 EMDEK - TRANSPORT

我在 INT 中有一个名为

Rotasi

的新列，它可以在“ROTASI”之后存储任何数字字符的值

所以对于这个要求，我的代码将是这样的：

UPDATE database_actual_pemupukan SET Rotasi = SUBSTRING(GL_DESCRIPTION, 
            PATINDEX('%[0-9]%', GL_DESCRIPTION), LEN(GL_DESCRIPTION));

它返回这样的错误

消息 245，第 16 级，状态 1，第 1 行 将 varchar 值“1 - MATERIAL”转换为数据类型 int 时转换失败。

我也尝试过这个查询

UPDATE database_actual_pemupukan
SET rotasi = 
    CASE 
        WHEN PATINDEX('%[0-9]%', GL_DESCRIPTION) > 0 THEN
            CAST(
                -- Extract the number starting from the first digit
                SUBSTRING(GL_DESCRIPTION, 
                          PATINDEX('%[0-9]%', GL_DESCRIPTION), 
                     
                          CASE 
                              
                              WHEN PATINDEX('%[^0-9]%', GL_DESCRIPTION + 'a') = 0 THEN LEN(GL_DESCRIPTION) - PATINDEX('%[0-9]%', GL_DESCRIPTION) + 1
                              ELSE PATINDEX('%[^0-9]%', GL_DESCRIPTION + 'a') - PATINDEX('%[0-9]%', GL_DESCRIPTION)
                          END
                ) AS INT
            )
        ELSE NULL -- If no number is found, set rotasi to NULL
    END;

它返回这样的错误

消息 537，第 16 级，状态 2，第 1 行 传递给 LEFT 或 SUBSTRING 函数的长度参数无效。 该声明已终止。

我错在哪里？

Answer 1

您的起点是正确的，您只需要有条不紊地完成提取，例如

WITH cte1 AS (
    SELECT *
    FROM (
        VALUES
        ('PEMUPUKAN - CPD HIK ROTASI 3 EMDEK - TRANSPORT'),
        ('PEMUPUKAN - CPD HIK ROTASI 2 EMDEK - UPAH'),
        ('PEMUPUKAN - CPD HIK ROTASI 2  - MATERIAL'),
        ('PEMUPUKAN - CPD HIK ROTASI 1  - TRANSPORT'),
        ('PEMUPUKAN - CPD HIK ROTASI 3  - MATERIAL'),
        ('PEMUPUKAN - CPD HIK ROTASI 1  - MATERIAL'),
        ('PEMUPUKAN - CPD HIK ROTASI 2 EMDEK - MATERIAL'),
        ('PEMUPUKAN - CPD HIK ROTASI 3 EMDEK - MATERIAL'),
        ('PEMUPUKAN - CPD HIK ROTASI 1 EMDEK - MATERIAL'),
        ('PEMUPUKAN - CPD HIK ROTASI 1 EMDEK - TRANSPORT')
    ) x (GL_DESCRIPTION)
), cte2 AS (
    SELECT
        GL_DESCRIPTION
        , PATINDEX('%[0-9]%', GL_DESCRIPTION) FirstNumber, LEN(GL_DESCRIPTION) Length
    FROM cte1
), cte3 AS (
    SELECT *
        , CHARINDEX(' ', SUBSTRING(GL_DESCRIPTION, FirstNumber, Length-FirstNumber)) FirstSpace
    FROM cte2
)
SELECT
    GL_DESCRIPTION
    , CONVERT(INT, SUBSTRING(GL_DESCRIPTION, FirstNumber, FirstSpace)) ExtractedNumber
FROM cte3;