Question

我在这里写了一些有关预期输出的内容，但它不适用于最后一列，所有字段都应以逗号结尾（不包括最后一列的值），我使用像这样的东西我的代码是波纹管

declare @query varchar set @Query = Left(@Query,len(@Query)-1)
SELECT  '@' + COLUMN_NAME as c1,
CASE DATA_TYPE 

WHEN 'NVARCHAR' then 'nvarchar(max)' + ','
WHEN 'INT' then 'int'  + ','
WHEN 'DATETIME' then 'Datetime()' + ',' 
when 'Float' then 'float' + ','
end
as c2
from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME='tbl_data'



c1           c2

@MastCode   float,
@BALCO_EMP_ID   float,
@MastName   nvarchar(max),
@FatherName nvarchar(max),
@Department nvarchar(max),
@PlantName  nvarchar(max),
@PO         nvarchar(max),
@PO_START   nvarchar(max),
@PO_END         nvarchar(max),
@Contractor nvarchar(max),
@ContractorCode nvarchar(max)

Answer 1

您可以将当前的查询逻辑放入CTE中，然后使用解析函数处理最终的逗号：

WITH cte AS (
    SELECT '@' + COLUMN_NAME AS c1,
        CASE DATA_TYPE 
        WHEN 'NVARCHAR' THEN 'nvarchar(max)'
        WHEN 'INT' THEN 'int'
        WHEN 'DATETIME' THEN 'Datetime()'
        WHEN 'Float' THEN 'float' END AS c2,
        ROW_NUMBER() OVER (ORDER BY DATA_TYPE) AS rn,
        COUNT(*) OVER () AS cnt
    FROM INFORMATION_SCHEMA.COLUMNS 
    WHERE TABLE_NAME = 'tbl_data'
)

SELECT
    c1 As col1,
    c2 + CASE WHEN rn < cnt THEN ',' ELSE '' END AS col2
FROM cte;

从列中删除最后一个逗号

1 个答案: