使用 CHARINDEX 和 LEN 在 SUBSTRING 之后将 NVARCHAR 转换为 INT

Question

我正在尝试使用 UI 连接两个表，但其中一个表中的 UI 前面有“CLIENT_”。当尝试从字符串中删除“CLIENT_”然后比较 UI 时，我收到以下错误。

将数据类型 nvarchar 转换为浮点数时出错。

当尝试将整个子查询转换或强制转换为 INT 或 FLOAT 时，会发生相同的错误。

有没有人有任何想法或知道我如何编写代码以使其正常工作。

SELECT DISTINCT 69 AS 'FIELD_ID',
ENTITY_ID,
AD.WIP AS 'WIP'
FROM [WORKVIEW].[DBO].ENTITY_MASTER EM
JOIN [LIVE].[MHGROUP].PROJECTS P ON P.PRJ_ID = EM.ENTITY_PARENT 
JOIN [WORKVIEW].[DBO].adn_NAMEACCOUNTSDATA_STAGING AD ON 
CAST((SELECT SUBSTRING(P.CUSTOM1, CHARINDEX ('_', P1.CUSTOM1) -1, LEN(P1.CUSTOM1)) 
FROM [IMAN-SQL].[LIVE].[MHGROUP].PROJECTS P1 
WHERE P.CUSTOM1 LIKE 'CLIENT_%') AS INT) = AD.NAMENO

我希望能够加入 P.CUSTOM1 和 AD.NAMENO 上的 NAMEACCOUNTSDATA_STAGING，因为这些是我可以将这些表加入在一起的唯一字段。

这项工作的最新尝试....

SELECT DISTINCT 69 AS 'FIELD_ID',
ENTITY_ID,
AD.WIP AS 'WIP'
FROM [WORKVIEW].[DBO].ENTITY_MASTER EM
JOIN [IMAN-SQL].[LIVE].[MHGROUP].PROJECTS P ON P.PRJ_ID = EM.ENTITY_PARENT 
JOIN [WORKVIEW].[DBO].WORKVIEW_NAMEACCOUNTSDATA_STAGING AD ON CONCAT('CLIENT_', AD.NAMENO) = P.CUSTOM1 AND P.CUSTOM1 LIKE 'CLIENT_%'

涉及的所有三个表的架构：

TABLE [dbo].[entity_master](
[entity_id] [int] IDENTITY(1,1) NOT NULL,
[entity_parent] [nvarchar](50) NOT NULL,
[entity_child] [nvarchar](50) NOT NULL,
[entity_status] [int] NOT NULL,
[entity_child_name] [nvarchar](250) NULL,
[entity_parent_name] [nvarchar](250) NULL,
[GUID] [varchar](50) NULL,

TABLE [dbo].[WORKVIEW_NAMEACCOUNTSDATA_STAGING](
[NAMENO] [int] NOT NULL,
[WIP] [decimal](18, 2) NULL,
[BILLED] [decimal](18, 2) NULL,
[WRITTENOFF] [decimal](18, 2) NULL,
[DEBTORRESTRICTION] [nvarchar](max) NULL,
[PAYMENTTERMS] [int] NULL,
[BILLING FREQUENCY] [nvarchar](max) NULL

TABLE [MHGROUP].[PROJECTS](
[PRJ_ID] [float] NOT NULL,
[PRJ_PID] [float] NULL,
[DEFAULT_SECURITY] [char](1) NOT NULL,
[IS_SECURED] [char](1) NOT NULL,
[PRJ_NAME] [nvarchar](254) NULL,
[PRJ_OWNER] [nvarchar](64) NULL,
[PRJ_DESCRIPT] [nvarchar](254) NULL,
[PRJ_STATE] [char](1) NULL,
[PRJ_PUBLIC] [char](1) NULL,
[PRJ_LOCATION] [nvarchar](254) NULL,
[TYPE] [int] NOT NULL,
[SUBTYPE] [nvarchar](64) NULL,
[INHERITS_SECURITY] [char](1) NOT NULL,
[DOCNUM] [float] NULL,
[VERSION] [int] NULL,
[CUSTOM1] [nvarchar](254) NULL,
[CUSTOM2] [nvarchar](254) NULL,
[CUSTOM3] [nvarchar](254) NULL,
[LEFT_VISIT] [int] NULL,
[RIGHT_VISIT] [int] NULL,
[TREE_ID] [int] NULL,
[EMAIL] [nvarchar](254) NULL,
[DOC_SAVED_SEARCH] [int] NULL,
[LAYOUT_NAME] [nvarchar](254) NULL,
[LAYOUT_ORDER] [int] NULL,
[LAYOUT_VIEW] [nvarchar](max) NULL,
[REFERENCE_DATABASE] [nvarchar](32) NULL,
[REFERENCE_PRJ_ID] [float] NULL,
[REFERENCE_TYPE] [int] NULL,
[REFERENCE_SUBTYPE] [nvarchar](64) NULL,
[IS_EXTERNAL] [char](1) NOT NULL,
[EXTRNL_AS_NRML] [char](1) NOT NULL,
[IS_DOC_SVD_SRCH] [char](1) NOT NULL,
[IS_PRJ_SVD_SRCH] [char](1) NOT NULL,
[IS_HIDDEN] [char](1) NOT NULL,
[EDITWHEN] [datetime] NOT NULL,

希望这就是您想要的。

Answer 1

将数字转换成字符串！

(SELECT SUBSTRING(P.CUSTOM1, CHARINDEX ('_', P1.CUSTOM1) -1, LEN(P1.CUSTOM1)) 
 FROM [IMAN-SQL].[LIVE].[MHGROUP].PROJECTS P1 
 WHERE P.CUSTOM1 LIKE 'CLIENT_%'
) = CONVERT(NVARCHAR(254), AD.NAMENO)

或者：

(SELECT P.CUSTOM1
 FROM [IMAN-SQL].[LIVE].[MHGROUP].PROJECTS P1 
 WHERE P.CUSTOM1 LIKE 'CLIENT_%'
) = CONCAT('CLIENT_', AD.NAMENO)

Answer 2

你测试你的子字符串了吗？在我的测试中，我得到了

将 nvarchar 值“T_1456”转换为数据类型 int 时转换失败。

因此，子字符串正在获取下划线的 charindex，然后您将删除一个字符以获取无法转换为 INT 的 T_。更改为加号而不是减号可以获得有效的联接。

CAST((SELECT SUBSTRING(P.CUSTOM1, CHARINDEX ('_', P1.CUSTOM1) +1, LEN(P1.CUSTOM1))