Splicing SQL display Chinese characters problem - sql

Question

I have following SQL script which I hope to cross apply to select Chinese column name
CREATE TABLE #temp([color] varchar(5), [size] varchar(5),[AQty] varchar(10),[BQty] varchar(10),[CQty] varchar(10),[DQty] varchar(10));
INSERT INTO #temp([color], [size], [AQty], [BQty],[CQty],[DQty])
VALUES ('A1', 'L','1','2','3','4')
, ('A1', 'M','1','2','3','4')
, ('A1', 'S','1','2','3','4')
, ('A1', 'XL','1','2','3','4')
, ('B1', 'L','1','2','3','4')
, ('B1', 'M','1','2','3','4')
, ('B1', 'S','1','2','3','4')
, ('B1', 'XL','1','2','3','4')
, ('B1', 'XXL','1','2','3','4')
, ('C1', 'L','1','2','3','4')
, ('C1', 'S','1','2','3','4')
declare #cols as varchar(max), #sql varchar(max)
select #cols = STRING_AGG(col, ', ') from (
select distinct QUOTENAME(size) as col from #temp
) as t
set #sql = '
select color, col as total, ' + #cols + '
from(
select color, size, col, [value]
from #temp
cross apply (
select ''总数一'', cast(AQty as varchar(10)) union all
select ''总数二'', cast(BQty as varchar(10)) union all
select ''总数三'', cast(CQty as varchar(10)) union all
select ''总数四'', cast(DQty as varchar(10))
) c(col, [value])
) d
pivot
(
max(value)
for size in (' + #cols + ')
) piv
order by color, total
'
exec(#sql)
But now exec SQL is display garbled when I hope to display Chinese column name
color total L M S XL XXL
A1 ??? 4 4 4 4 NULL
B1 ??? 4 4 4 4 4
C1 ??? 4 NULL4 NULLNULL
I tried to change it like this, change variable nvarchar, set #sql with N and change cross apply select with N, but now not work.
declare #cols as nvarchar(max), #sql nvarchar(max)
set #sql = N'
select color, col as total, ' + #cols + '
from(
select color, size, col, [value]
from #temp
cross apply (
select N''总数一'', cast(AQty as varchar(10)) union all
select N''总数二'', cast(BQty as varchar(10)) union all
select N''总数三'', cast(CQty as varchar(10)) union all
select N''总数四'', cast(DQty as varchar(10))
) c(col, [value])
) d
pivot
(
max(value)
for size in (' + #cols + ')
) piv
order by color, total
'
exec(#sql)

Answer 1

I have solved my problem by adding N after + #cols +
declare #cols as nvarchar(max), #sql nvarchar(max)
set #sql = N'
select color, col as total, ' + #cols + N'
from(
select color, size, col, [value]
from #temp
cross apply (
select N''总数一'', cast(AQty as varchar(10)) union all
select N''总数二'', cast(BQty as varchar(10)) union all
select N''总数三'', cast(CQty as varchar(10)) union all
select N''总数四'', cast(DQty as varchar(10))
) c(col, [value])
) d
pivot
(
max(value)
for size in (' + #cols + ')
) piv
order by color, total
'
exec(#sql)