documentationcoalesce¶
Description¶
Return the first non-null argument or null if all are null. All arguments must have the same data type.
Return type¶
least common generalization skipping variants
Domain¶
This is a scalar function (calculates a single output value for a single input row.)
Categories¶
Usage¶
coalesce(expression_1, expression_2, ...)
Argument |
Type |
Optional |
Repeatable |
Restrictions |
|---|---|---|---|---|
expression |
comparable |
no |
yes |
none |
Examples¶
make_col foo:coalesce(bar, baz, 0)
Create a new column ‘foo’, where for each row, the value of column ‘foo’ is set to the value of column ‘bar’ if it isn’t null, or to the value of column ‘baz’ if it isn’t null, or 0.