Difference between #temptable and ##TempTable?

Question

What is the difference between #temptable and ##TempTable in SQL Server?

Answer 1

simple way of testing #localtable and ##globaltable

Try this in a different SQL Query Window

create table ##globaltemptable (id int )
go
insert into ##globaltemptable values (1)
go
select * from ##globaltemptable

Try this in a different SQL Query Window

create table #localtemptable (id int )
go
insert into #localtemptable values (1)
go
select * from #localtemptable

Now if you run the select query for the table : #localtemptable in the global window syntax , you will get an error as follows :-

Invalid object name '#localtemptable'.

While you run the select query for the table : ##globaltemptable in any query window of the same session, you will get the query results return.