A relational database consists of multiple related tables. In the previous post, I copied table data into another table. Copy a table from one database to another in Postgres. It takes the following subforms: ADD COLUMN: this uses similar syntax as CREATE TABLE command to add a new column to a table. i.e. In this article, we are going to see how to Create PostgreSQL table structure from existing table with examples. pg_dump -a -t my_table my_db | psql target_db.While I'm here, If your database is on a server, I find it easier to just dump the database to a file and then scp that file to the database, then send the contents of the file to psql. PostgreSQL CREATE TABLE AS statement is used to create a table from an existing table by copying columns of an existing table. Check the below example: Create a sample table … You can use create table ... like. 84. CREATE TABLE AS bears some resemblance to creating a view, but it is really quite different: it … PostgreSQL query to copy the structure of an existing table to create another table. The table columns have the names and data types associated with the output columns of the SELECT (except that you can override the column names by giving an explicit list of new column names).. I'm trying to insert data to a table from another table and the tables have only one column in common. Copying data between tables is just as easy as querying data however it will take a bit longer to run than a normal query. In this example, User Table will have a column that references the Agency table. The ALTER TABLE command changes the definition of an existing table. A table consists of rows and columns. CREATE TABLE agencies ( -- first create the agency table id SERIAL PRIMARY KEY, name TEXT NOT NULL ) CREATE TABLE users ( id SERIAL PRIMARY KEY, agency_id NOT NULL INTEGER REFERENCES agencies(id) DEFERRABLE INITIALLY DEFERRED -- this is going to references your agency table. I have TABLE1: id, col_1 (not null), col_2(not null), col_3 (not null) and TABLE2: id, col_a, col_b, col_c It is important to note that when creating a table this way, the new table will be filled with records from the existing table (based on the SELECT operator). In this post, I am creating a Copy of Table from another table of PostgreSQL. It can be used to update an inventory, create a table that has different permissions than the original, and much more. create table table_name as select * from exsting_table_name where 1=2; For creating a duplicate table, we have two options like SELECT INTO and CREATE TABLE AS. DROP COLUMN: for dropping a table column. If you just want to select from some values, rather than just creating a table and inserting into it, you can do something like: WITH vals (k,v) AS (VALUES (0,-9999), (1, 100)) SELECT * FROM vals; The problem is, that the TABLE1 has columns that won't accept null values so I can't leave them empty and I can't get them from the TABLE2. Example. EDIT: I am leaving the original accepted answer as it is, but please note that the edit below, as suggested by a_horse_with_no_name, is the preferred method for creating a temporary table using VALUES. 496. In this post, I am sharing a demonstration on how to copy data from one table to another table using INSERT INTO SELECT in PostgreSQL. note that if the other database already has the table set up, you should use the -a flag for data only. This article may help the beginner of PostgreSQL, because moving or copying data within the database which is the ubiquitous task. 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