如何在SQL Server中用0替換尾隨空格？

Question

鑑於以下情況 - 如何在SQL Server中將尾隨空格替換爲0？

CREATE TABLE TestTable 
(
    TestField CHAR(8) 
) 

INSERT INTO TestTable 
SELECT ' 1 1 1 ' 
INSERT INTO TestTable 
SELECT ' 1 1 1 1' 

SELECT 
TestField, 
LEN(TestField) AS LenTestField, 
REPLACE(TestField, ' ', '0') AS TestFieldReplaced, 
LEN(REPLACE(TestField, ' ', '0')) AS LenTestFieldReplaced, 
REPLACE(TestField, ' ', '0') + REPLICATE('0', DATALENGTH(TestField)-LEN(TestField)), 
REPLACE(CONVERT(VARCHAR,TestField), ' ', '0') 
FROM TestTable 

Answer 1

您可以利用LEN和DATALENGTH的區別。 LEN刪除尾隨空格，DATALENGTH不會。和複製將採取零長度參數

SELECT 
    RTRIM(TestField) + REPLICATE('0', DATALENGTH(TestField)-LEN(TestField)) 
FROM 
    TestTable 

Answer 2

這個怎麼樣：

DECLARE @test TABLE 
(num nvarchar(30)) 

INSERT INTO @test (num) VALUES ('1 1 1 ') 

SELECT LEFT(num, LEN(num)) + REPLICATE('0', LEN(REPLACE(num, ' ', '*')) - LEN(num)) FROM @test