NULL is not determinate value and is not counted when the COUNT function
As we can see when you supply NULL explicitly to COUNT it will produce 0, even if the query was executed against dual table. In plain words, you can translate this operation as “nothing to count” since NULL is exactly void and/or nothing.
SQL is a strongly typed language: columns are defined as a certain data type, and an attempt to enter a value of […]
The following table summarizes the equivalents for ANY and ALL: Let’s have a look for each case: < ANY ( LESS […]
NULL is not determinate value and is not counted when the COUNT function is used with the DISTINCT keyword For instance, if […]
When we are using a format mask ( for example with TO_NUMBER function ) we have basically three options : 1 We […]
