A temporary table can have 3 kinds, the #
is the most used. This is a temp table that only exists in the current session. An equivalent of this is @
, a declared table variable. This has a little less “functions” (like indexes etc) and is also only used for the current session. The ##
is one that is the same as the #
, however, the scope is wider, so you can use it within the same session, within other stored procedures.
You can create a temp table in various ways:
declare @table table (id int) create table #table (id int) create table ##table (id int) select * into #table from xyz
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