Author: codertutor_3o6d0o

Column specified more than once Duplicate column The cause of error: Column specified more than once. The solution is to remove duplicate columns. Wrong insert INSERT INTO test.students (id, first_name, first_name) VALUES (6, 'Paul', 'Paul'); ERROR: column “first_name” specified more than...

Create postgresql database Create database syntax, alter database examples, rename and drop. Syntax CREATE DATABASE db_name [ [ WITH ] [ OWNER [=] username ] [ TEMPLATE [=] template ] [ ENCODING [=] encoding ] [ LC_COLLATE [=] lc_collate ] [...

Create postgresql schema Create schema syntax, Alter schema with examples. Syntax CREATE SCHEMA schema_name [ schema_element [ ... ] ]; CREATE SCHEMA AUTHORIZATION username [ schema_element [ ... ] ]; Example CREATE SCHEMA test; Create a schema for user user_1, and...

Create postgresql user Create database user, alter user password and drop username. Rename, modify user. Syntax CREATE USER user_name; Example CREATE USER user_test; Alter postgresql user Syntax ALTER USER user_name [ [ WITH ] option [ ... ] ] where option...

Alter postgresql table Alter table. Modify column name or column data type. Drop column. Disable constraint or trigger Syntax ALTER TABLE [ IF EXISTS ] [ ONLY ] table_name RENAME [ COLUMN ] column_name TO new_column_name; ALTER TABLE [ IF EXISTS...