What actually happens when you run a SQL query that doesn’t return any rows? For example, think of a WHERE clause with the condition 1=2, which can never be fulfilled and therefore rows can never be returned. First, let’s look at a few examples that should show you what you can expect as a return … Read more
SQL IN list SQL IN Statement (IN lists) can only process and validate 1000 values. Everything about it returns an error. Here’s an example to demonstrate an IN list. Here only employees and workers are shown, which identification number is in the IN list. SELECT * FROM emp WHERE 1=1 AND empNo IN (1, 2, … Read more
Sometimes default values are necassary. Normally you can use NVL or NVL2 when you get NULL values as return value. But it is also possible, that no row is returned. In this case, NVL or NVL2 is not working, cause you get no value back – not even NULL. Therefore, there are some options – … Read more
