In MariaDB, the INTERSECT operator intersects two queries and returns only those rows that are returned in both queries.
It returns all rows from the left SELECT result set that are also present in the right SELECT result set.
Relational
6 Ways to Select Duplicate Rows in SQLite
The following queries can be used to return duplicate rows in SQLite.
Here, the duplicate rows contain duplicate values across all columns, including the ID column.
MariaDB EXCEPT Operator Explained
In MariaDB, the EXCEPT operator returns rows from the left input query that aren’t output by the right input query.
Another way of putting it is that it returns all rows from the left SELECT result set except rows that are in right SELECT result set.
Find Values That Don’t Contain Numbers in MySQL
If you need to return all rows that don’t contain any numbers, the following might help.
Strictly speaking, numbers can be represented by words and other symbols, but for this article “number” simply means “numerical digit”. So we’re finding values that don’t contain any numerical digits.
4 Ways to List All Views in a MariaDB Database
Below are four ways to list out the views in a MariaDB database using SQL or the command line.
4 Ways to Check if a Table Exists Before Dropping it in SQL Server (T-SQL)
Dropping a table in SQL easy. You simply use DROP TABLE myTable where myTable is the name of the table you want to drop. You can use this method to drop a table in SQL Server via T-SQL script.
But you’ll get an error if the table doesn’t actually exist. That is, unless you check for the existence of the table first.
Below are four ways of using T-SQL to check whether the table exists before dropping it.
2 Ways to Delete Duplicate Rows in SQLite
The following options can be used to delete duplicate rows in SQLite.
These examples delete duplicate rows but keep one. So if there are three identical rows for example, it deletes two of them and keeps one. This is often referred to as de-duping the table.
4 Ways to Find Duplicate Rows in MySQL
If you think a MySQL table might have duplicate rows, you can use the following options to return all duplicates.