Here are three examples of using SQL to find and select the row with the minimum value in a given column.
The examples work in most major RDBMSs, including MySQL, MariaDB, PostgreSQL, SQLite, Oracle, and SQL Server.
DBMS
Database Management Systems
6 Ways to Select Duplicate Rows in Oracle
The following examples return duplicate rows from an Oracle Database table.
Oracle MINUS Operator Explained
In Oracle Database, the MINUS operator is used to return only unique rows returned by the first query but not by the second.
4 Ways to Find Rows that Contain Uppercase Letters in Oracle
Here are four options for returning rows that contain uppercase characters in Oracle Database.
Fix “ERROR: each UNION query must have the same number of columns” in PostgreSQL
When using the UNION operator in PostgreSQL, if you encounter an error that reads “ERROR: each UNION query must have the same number of columns“, it’s because there’s a mismatch in the number of columns returned by the queries on either side of the UNION operator.
This error occurs when the number of columns returned by each SELECT statement is different.
The way to fix this is to ensure that both SELECT statements return the same number of columns.
How UNION Works in PostgreSQL
In PostgreSQL, the UNION operator combines the results from multiple queries into a single result set.
2 Ways to Return Rows that Contain Only Non-Alphanumeric Characters in Oracle
Below are two methods for returning rows that only contain non-alphanumeric characters in Oracle Database.
Alphanumeric characters are alphabetic characters and numeric characters.