Question

在SQL Server中，我尝试将CHAR(0)替换为''，但由于我的字段实际上是NVARCHAR字段，因此无效，我的排序规则为Latin1_General_CI_AS但是我转换为SQL_Latin1_General_CP1_CI_AS它仅适用于VARCHAR而非NVARCHAR。

SELECT val, REPLACE(val , CHAR(0), 'x')
FROM    (
         SELECT 'a' + CHAR(0) + 'b' AS val
        ) AS X

返回a | a

SELECT val, REPLACE(CAST(val COLLATE SQL_Latin1_General_CP1_CI_AS AS varchar(100)), CHAR(0), 'x')
FROM    (
         SELECT 'a' + CHAR(0) + 'b' AS val
        ) AS X

返回a | axb

SELECT val, REPLACE(CAST(val COLLATE SQL_Latin1_General_CP1_CI_AS AS varchar(100)), CHAR(0), 'x')
FROM    (
         SELECT CAST('a' + CHAR(0) + 'b' AS NVARCHAR(100)) AS val
        ) AS X
SELECT val, REPLACE(CAST(val COLLATE SQL_Latin1_General_CP1_CI_AS AS nvarchar(100)), CHAR(0), 'x')

返回a | axb

FROM    (
         SELECT CAST('a' + CHAR(0) + 'b' AS NVARCHAR(100)) AS val
        ) AS X
SELECT val, REPLACE(CAST(val COLLATE SQL_Latin1_General_CP1_CI_AS AS varchar(100)), nCHAR(0), 'x')

返回a | a

FROM    (
         SELECT CAST('a' + CHAR(0) + 'b' AS NVARCHAR(100)) AS val
        ) AS X
SELECT val, REPLACE(CAST(val COLLATE SQL_Latin1_General_CP1_CI_AS AS nvarchar(100)), nCHAR(0), 'x')

返回a | a

FROM    (
         SELECT CAST('a' + CHAR(0) + 'b' AS NVARCHAR(100)) AS val
        ) AS X

返回a | a

有没有办法可以用0x0000替换''个字符而不会丢失我的NVARCHAR状态

修改：最后一个查询的预期值为a | axb（或类似但支持NVARCHAR的查询。

Answer 1

使用二进制整理子句，不需要CAST

;WITH T
     AS (SELECT CAST('a' + CHAR(0) + 'b' AS NVARCHAR(100)) AS val)
SELECT val,
       REPLACE(val COLLATE Latin1_General_100_BIN, nCHAR(0), 'x')
FROM   T

REPLACE CHAR（0）NVARCHAR Latin1_General_CI_AS整理

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