This article discusses table partitions, the benefits of using them to increase performance, and the types of partitions that can be used in PostgreSQL.
How to Delete All Table Rows in … Bilal ShahidFeb 02, 2024 PostgreSQLPostgreSQL Table Current Time0:00 / Duration-:- Loaded:0% The problem at hand is deleting all the rows, or tuples, from a table but not deleting the table itself. This means that all the data from the table will...
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...
PostgreSQL declarative partitioning is highly flexible and provides good control to users. Users can create any level of partitioning based on need and can modify, use constraints, triggers, and indexes on each partition separately as well as on all partitions together. Query performance can be inc...
With good planning and taking all factors into consideration, table partitioning can give a great performance boost and scale your PostgreSQL to larger datasets. How to use partitioning As of PostgreSQL12 release List, Range, Hash and combinations of these partition methods at different levels are ...
Basic SELECT Query to Retrieve Tables Inside INFORMATION_SCHEMA in PostgreSQLA very simple query to get all the tables inside this SCHEMA would be to write something like this.select * from information_schema.tables This would return a table like this.Output:...
PostgreSQL provides a RENAME COLUMN clause that is used with the collaboration of ALTER TABLE command to rename a column.
PARTITION pRegion_2 VALUES IN('Dalat', 'Daklak', 'Pleiku'), PARTITION pRegion_3 VALUES IN('Danang', 'Hoian', 'Hue'), PARTITION pRegion_4 VALUES IN('Hanoi', 'Sapa', 'Ninhbinh') ); 3. To create a hash partitioned table
How to Delete Duplicate Rows Using Subquery in PostgreSQL? Run the following query for deleting duplicate rows from a table by employing a subquery: DELETEFROMprogramming_languagesWHEREidIN(SELECTidFROM(SELECTid, ROW_NUMBER()OVER(PARTITIONBYlanguageORDERBYidASC)ASrow_numFROMprogramming_languages) lang...
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 ...