For example, we have a table:
| id | field | value | |----|-------|-------| | 1 | X | Y | | 1 | V | Y | | 1 | Z | W | | 1 | Z | T |
and I want to have a following output:
| id | field | value | field_occurencies | |----|-------|-------|-------------------| | 1 | X | Y | 1 | | 1 | V | Y | 1 | | 1 | Z | W | 2 | | 1 | Z | T | 2 |
Is there any way to do this?
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Answer
Windowing functions are for that very purpose:
COUNT(*) over (partition by field) as field_occurence
We can’t tell if your particular database product supports window functions (you didn’t tell us)