You can rename a table in PostgreSQL by using the ‘ALTER TABLE’ command as follows: ALTER TABLE tablename RENAME TO preferredtablename; If the table name has odd characters in it, then a syntax error might be generated which can be solved by placing the table name in double quotes: ...
How to Change or ALTER the Table Owner in Postgres? To change or modify the table’s owner, use the “ALTER TABLE” command followed by the selected “table’s name”. After that, use the “OWNER TO” clause followed by the new owner’s name. The following syntax will help you clarif...
DROP TABLE [IF EXISTS] table_name [CASCADE | RESTRICT]; In order to delete the table from the database, you need to define the name of the table after the DROP TABLE keyword. PostgreSQL throws an error if you delete a non-existent table. To avoid exceptions while deleting such a situat...
InPostgreSQL, theALTER TABLEcommand/clause can be used to add columns to any specific table. To do so, follow the below-given syntax: ALTERTABLEtbl_nameADDcol_name data_type; - Here, theALTER TABLEcommand/statement is used to add a column in a table. - Thetbl-nameis the name of the...
Follow the comma-separated syntax to change the data type of more than one column using a single query: ALTERTABLEtab_nameALTERCOLUMNcol_1TYPEnew_data_type,ALTERCOLUMNcol_2TYPEnew_data_type; Example: How to update data types of several columns using a single command in PostgreSQL?
How to Change Table Data in PostgreSQL We can change the definition of our tables with the following general syntax: ALTER TABLE table_nameAction_TO_Take; For example, we can add a column to our "pg_equipment" table by entering this command: ...
PostgreSQL renamed the database statement used to change the database name to another name; we can rename any database using the alter database statement. To rename the database in PostgreSQL, we first need to disconnect from the database from which we have connected; after disconnecting from...
tablespace_name:Specify the name of the tablespace. If you do not specify the tablespace, the table will be created inpg_defaulttablespace PostgreSQL supports the following column constraints: PRIMARY KEY:The primary key identifies a record from the table uniquely. A PostgreSQL table can have only...
How to Insert Data Into an Array How to Query Arrays How to Use string_agg() Database Management How to Create a Table How to Drop a Table How to Rename a Table How to Truncate a Table How to Duplicate a Table How to Add a Column How to Change a Column Name How to Add a Defau...
You have a table address and want to check if there’s already a row with address_id = 100 existing. You can use COUNT to check: SELECT COUNT(*) FROM address WHERE address_id = 100; But if you are looking for a faster query with a yes/no answer: SELECT EXISTS(SELECT 1 FROM ...