How alter view in SQL server

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How to modify the view when the database name and SQL command are variables
An example as below:
declare @sqlcommand nvarchar(max),@db_py nvarchar(50)
set @db_py='PY202'
set @sqlcommand='alter view test as
select * from PY_S01
union all
select * from PY_S02'
exec(N'use '''+@db_py+''';exec sp_executesql N'''+@sqlcommand+'''')

What I have tried:

1.I change the last commmand to
exec(N'use PY202;exec sp_executesql N'''+@sqlcommand+'''')
execute successfull!
2.set @sqlcommand='use '+@db_py+char(10)+'GO'+char(10)+'alter view test as
select * from PY_S01
union all
select * from PY_S02'
exec(@sqlcommand)

execute fail
but i print @sqlcommand and copy the result to execute ,success

Posted 1-Aug-18 18:46pm

Member 13908127

Updated 1-Aug-18 19:36pm

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Santosh kumar Pithani 2-Aug-18 1:08am

AS i know "Go" statement is creating the issue due to "Go" in query line.

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Santosh kumar Pithani · Accepted Answer · 2018-08-01T19:36:00

SQL

--i hope your view name is same and existed in all db .If yes, below query will help you.
DECLARE @sqlcommand NVARCHAR(MAX),@db_py NVARCHAR(50)
SET @db_py='PY202'
SET @sqlcommand='USE '+QUOTENAME(@db_py)+' 
                  GO
				 ALTER VIEW test AS
                    SELECT * FROM PY_S01
                     UNION ALL
                    SELECT * FROM PY_S02';

--you can directly use DB name in alter view command as like below query.

SET @sqlcommand='ALTER VIEW test AS SELECT * FROM PY_S01  UNION ALL SELECT * FROM PY_S02';
SET @sqlcommand=REPLACE(@sqlcommand,'ALTER VIEW test','ALTER VIEW'+SPACE(1)+QUOTENAME(@db_py)+'.DBO.test ');

EXEC(@sqlcommand)