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How to Duplicate a Table in Snowflake

Sometimes you need to duplicate a table. There are various methods, depending on your intent.

Copy both the entire table structure and all the data inside:

--method 1
create table sessions_copy clone sessions;

--method 2
create table sessions_copy as
select *
from sessions;

Copy entire table structure along with particular data set:

create table sessions_db_1_copy as
select *
from sessions_db_1
where dates is null;

Copy only particular columns into new table along with particular data set:

create table sessions_dm_1_copy as
select
  id,
  start_date,
  end_date
from sessions_dm_1
where category = 2;

Copy only particular columns from more tables into new table along with particular data set:

create table users_sessions_1_rpt as
select
  u.name,
  s.start_date as session_start_date,
  s.end_date as session_end_date
from sessions s
left join user_sessions us on s.id = us.session_id
left join users_1 u on us.user_id = u.id
where u.active = true;

Copy only table structure, no data copying:

create table users_copy like users;
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