sql 链接服务器openquery查询带变量+拼接语句

DECLARE @tablename VARCHAR (30), @tablename_1 VARCHAR (30),@tablename_2 VARCHAR (30),@fsc VARCHAR (10), @sql VARCHAR (5000) ,@fsc_1 VARCHAR (10),@fsc_2 VARCHAR (10)
SET @fsc = (SELECT min(fscprdid) FROM fscprd WHERE cseflg = 'n')
SET @fsc_1 = (SELECT max(fscprdid) FROM fscprd WHERE cseflg = 'y')
SET @fsc_2 = (SELECT max(fscprdid) FROM fscprd WHERE cseflg = 'y' AND fscprdid NOT IN (SELECT max(fscprdid) FROM fscprd WHERE cseflg = 'y'))
SET @tablename = 'stockbth_'+@fsc
SET @tablename_1 = 'stockbth_'+@fsc_1
SET @tablename_2 = 'stockbth_'+@fsc_2
--SELECT @tablename ,@fsc
--SELECT @tablename_1
--SELECT @tablename_2
 
SET @sql ='insert into     E9_Scm_Gdshnd_yyshop select * from openquery([E91],'
SET @sql=@sql+    '    ''
SELECT stockbth.gdsid
    , stockbth.fscprdid
    , stockbth.actdat
    , stockbth.prvid
    , stockbth.prvempid
    , stockbth.bllid
    , stockbth.blldes
    , CAST (stockbth.srcbllno AS CHAR (20)) AS srcbllno
    , CAST (stockbth.dbtcrt*-1 AS VARCHAR (2)) AS dbtcrt
    , stockbth.qty
    , stockbth.savdptid
    , stockbth.vlddat
    , stockbth.bthno
    , stockbth.dptid
    , stockbth.prc
    , stockbth.amt
from '+ @tablename + ' as stockbth 
where stockbth.savdptid IN (''''602'''',''''603'''') AND actdat >=CONVERT (VARCHAR (8), DATEADD (dd, -12, GETDATE ()), 112) AND stockbth.fscprdid = '''''+@fsc+''''' '')    '
exec(@sql)