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COALESCE
Given a list of values, returns the first non-NULL value.
Syntax
COALESCE ( val, [val, [val ...]])
Arguments
- val: any object
Return Type
Returns any object type, according to the type of the first non-NULL value in the list. Returns NULL if all values are NULL.
Examples
select coalesce(NULL, NULL, 1, 2, 3);
+-------------------------------+
| coalesce(NULL, NULL, 1, 2, 3) |
+-------------------------------+
| 1 |
+-------------------------------+
