Which operator should be used to find rows in one table that have no related rows in another table?INANYALLNOT EXISTS

The operator that should be used to find rows in one table that have no related rows in another table is "NOT EXISTS". This operator is used in SQL (Structured Query Language) for database manipulation. Here is a step by step guide on how to use it:

1. First, you need to understand the structure of your tables and identify the common field(s) between them. This is usually a primary key in one table that is used as a foreign key in another table.

2. Once you have identified the common field(s), you can write a SQL query using the "NOT EXISTS" operator. The "NOT EXISTS" operator returns true if the subquery returns no row.

3. The structure of the query would look something like this:

SELECT column_name(s)
FROM table1
WHERE NOT EXISTS (SELECT column_name(s) FROM table2 WHERE table1.common_field = table2.common_field);

In this query, replace column_name(s) with the name of the column(s) you want to select, table1 and table2 with the names of your tables, and common_field with the name of the common field.

4. This query will return all rows from table1 that have no related rows in table2.

Remember to always test your queries on a small dataset first to ensure they're working as expected.