1. How to delete a column in a database table using postgres via the command line?
(Databases/pgsql)

Questions: How to delete a column in a database table using postgres sql via the command line?   Answer: Use the following statement ALTER TABLE my_table DROP COLUMN my_column; Replace my_table with ...

2. What's the difference between RIGHT, LEFT, OUTER, INNER, JOIN?
(Databases/Sql)

... if the same ID value exists in all tables used. If we have a product's table and a categories table, both have columns with name product_id. If the product_id in the product's table does not match the ...

3. How to copy a columns data from one table into a column in another table using postgres?
(Databases/pgsql)

Question: How to copy a columns data from one table into a column in another table using postgres? Eg. name columns data from the users table into name column in the new_users table. Answer: Execute the ...