Null value function oracle

Submit Next Question. By signing up, you agree to our Terms of Use and Privacy Policy. Forgot Password? This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy. Popular Course in this category. Course Price View Course. Free Data Science Course. If a column in a row has no value, then the column is said to be null , or to contain null.

Use a null when the actual value is not known or when a value would not be meaningful. Oracle Database treats a character value with a length of zero as null. However, do not use null to represent a numeric value of zero, because they are not equivalent.

It accepts two or more parameters and returns the first non-null value in a list. If all parameters contain null values, it returns null.

It accepts two parameters and returns null if both parameters are equal. If they are not equal, the first parameter value is returned. In our test table the values of COL3 and COL4 are equal in row 4, so we would only expect null returned for that row using the following query.

For example, null added to 10 is null. In fact, all operators except concatenation return null when given a null operand. You can use the NVL function to return a value when a null occurs. Most aggregate functions ignore nulls.