We can remove the duplicate rows from a statement’s result set using a PostgreSQL DISTINCT clause in the SELECT statement. The PostgreSQL DISTINCT clause keeps only one row for all groups of duplicate rows. PostgreSQL DISTINCT removes all duplicate rows and maintains only one row for a group o...
In PostgreSQL, you can use the DISTINCT clause to retrieve unique rows based on one or more columns. By specifying multiple columns with DISTINCT, you filter the results to return only the unique combinations of the specified columns. Additionally, PostgreSQL provides a DISTINCT ON clause that all...
Use the PostgreSQLunnest ()Function WithDISTINCTClause TheDISTINCTclause is used in multiple database languages to remove duplicates. In PostgreSQL, it can remove all the duplicates of any kind of data, whether an integer, string, etc., but it has a limitation in that it can only remove dupl...
When distinct cannot return unique row when all columns combination is not unique then we can use distinct on clause which will give first row from that set of duplicate rows.The column which we are specifying in DISTINCT ON should also be present in the ORDER BY clause; otherwise you will...
“conditions” names the conditions that must be met in order to select the records If you don’t want to remove duplicate data, or if you’re sure that there will be no duplicates in the result set, then you can use ALL instead of DISTINCT. But ALL is the default keyword in SQL st...
Connecting PostgreSql to C# windows forms Connecting to Remote Server (Linux) from .NET application(C#) to run a UNIX script hosted on linux server Connecting to remote server outlook.office365.com failed with the following error message : Access is denied. Connection refused if I use 127.0.0.1...
Sometimes, you may want to use array_agg in combination with a subquery to aggregate data more flexibly. Code: SELECTarray_agg(name)ASall_studentsFROM(SELECTDISTINCTnameFROMstudents)ASunique_names;-- Get unique names before aggregation Copy ...
Pivoting in PostgreSQL The PostgreSQL database also does not support the SQLPIVOToperator. Therefore, when creating pivot tables, it is important to use theCASEstatement with conditional aggregation.The query below is an example of the conditionalCASEstatements used to create pivot tables in PostgreSQL...
This way you can find and delete the duplicate rows from a table in PostgreSQL. Conclusion PostgreSQL offers multiple ways to find and delete duplicate rows. For finding the duplicates, we can utilize the Postgres COUNT() function. While to remove duplicate rows, we can use the “DELETE USIN...
The second table will be calledbook_leasesand will store information about borrowed books. It is structured similarly to the previous one, but leases are characterized by two distinct dates: lease date and lease duration. To represent that, the leases table will hold five columns: ...