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create table YourTable(Id int identity(1,1),Col1 varchar(100));

insert into YourTable(Col1)
values('Stack'),('Over'),('Flow')


3 rows affected
Declare @SqlStr varchar(max)

create table #TempTable(Id int identity(1,1),Col1 varchar(100))
set @SqlStr='Insert into #TempTable(Col1) select Col1 from YourTable'
exec(@SqlStr)
select * from #TempTable

Id Col1
1 Stack
2 Over
3 Flow
Declare @SqlStr varchar(max)
set @SqlStr='select * into #TempTable1 from YourTable'
exec(@SqlStr)
select * from #TempTable1
Msg 208 Level 16 State 0 Line 4
Invalid object name '#TempTable1'.