What is not equal to 0 in SQL?

 In SQL, "not equal to 0" can be expressed using one of the following operators:

1. <> (standard SQL syntax):

   SELECT * FROM table_name WHERE column_name <> 0;
   

2. != (widely supported, though not part of the original SQL standard):

   SELECT * FROM table_name WHERE column_name != 0;
   

Both operators work in most modern SQL databases like MySQL, PostgreSQL, SQL Server, and Oracle. They mean "not equal to" and can be used interchangeably.