Best way to create a temp table with same columns and type as a permanent table

Question

I need to create a temp table with same columns and type as a permanent table. What is the best way to do it? (The Permanent table has over 100 columns)

i.e.

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Answer 1

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select top 0 * into #temptable from mytable

Note : This creates an empty copy of temp, But it doesn't create a primary key