组由一对列sql

Question

I have a table in SQL name: pgcPhieuThu

I want to creat a stored procedure for SoPhieu with: + if parameter = 0 then SoPhieu= 'PT-1->n' else parameter = 1 then SoPhieu= 'BC-1->n'

ALTER proc pgcPhieuThu_TaoSoPhieu3 
 @HinhThuc int,@SoPhieu NVARCHAR(50) OUTPUT
as
declare @MaPT INT
SELECT  @MaPT= ISNULL(SUBSTRING(MAX(pgcPhieuThu.SoPhieu),4, LEN(pgcPhieuThu.SoPhieu)),0) + 1
FROM pgcphieuthu
    GROUP BY SUBSTRING(pgcPhieuThu.SoPhieu,1,3)
SET @SoPhieu = CASE WHEN @HinhThuc = 0 then 'PT-'+ CAST(@MaPT AS NVARCHAR(50))
                    ELSE 'BC-'+ CAST(@MaPT AS NVARCHAR(50))

but Column 'pgcphieuthu.SoPhieu' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

Answer 1

SoPhieu is not an column in the table. Its an parameter to the stored procedure. so replace the 'SoPhieu' to 'SoPhieu'with in the stored procedure. It should work then on.