Classification Classification (BOMDAS?) data

I wonder how ranking in the row of data may cause the there is not not a rank of number 1?

In some the results returned by that my RANKING3 with a single returned line starts with a grade of '2', it has no '1' grade.

My reason for doing it this way, is that each rating uses a different partition on the new set of results with each subquery. I am relatively new to writing SQL and open to advice.

SELECT COLUMNS

DE)

SELECT THE COLUMNS, RANK() OVER (PARTITION BY THE ORDER OF THE COLUMNS BY COLUMN) RANKING3

DE)

SELECT THE COLUMNS, RANK() OVER (PARTITION BY THE ORDER OF THE COLUMNS BY COLUMN) RANG2

DE)

SELECT THE COLUMNS, RANK() OVER (PARTITION BY THE ORDER OF THE COLUMNS BY COLUMN) RANKING1

DE)

SELECT TBL1 COLUMNS

UNION

SELECT THE COLUMNS OF THE TBL2

)

) WHERE RANKING1 = '1'

) WHERE RANG2 = '1'

) WHERE RANKING3 = '1'

Do you sometimes feel that you have been watching code if long you can't see what's right in front of you?

I filter the results of the ranking at the end without thinking.

Its a small segment of merger of about 10 views I am engineer back in a single view and of course forgot the 2nd where clause. Much easier to spot when I simplified as below.

Thanks for your help.

Question:

SELECT COLUMNS

DE)

SELECT THE COLUMNS, RANK() OVER (PARTITION BY THE ORDER OF THE COLUMNS BY COLUMN) RANKING3

DE)

SELECT THE COLUMNS, RANK() OVER (PARTITION BY THE ORDER OF THE COLUMNS BY COLUMN) RANG2

DE)

SELECT THE COLUMNS, RANK() OVER (PARTITION BY THE ORDER OF THE COLUMNS BY COLUMN) RANKING1

DE)

SELECT TBL1 COLUMNS

UNION

SELECT THE COLUMNS OF THE TBL2

)

) WHERE RANKING1 = '1'

) WHERE RANG2 = '1'

) WHERE RANKING3 = '1'

AND DATE_COLUMN > SYSDATE



Difficulty:

SELECT COLUMNS

DE)

SELECT THE COLUMNS, RANK() OVER (PARTITION BY THE ORDER OF THE COLUMNS BY COLUMN) RANKING3

DE)

SELECT THE COLUMNS, RANK() OVER (PARTITION BY THE ORDER OF THE COLUMNS BY COLUMN) RANG2

DE)

SELECT THE COLUMNS, RANK() OVER (PARTITION BY THE ORDER OF THE COLUMNS BY COLUMN) RANKING1

DE)

SELECT TBL1 COLUMNS

UNION

SELECT THE COLUMNS OF THE TBL2

)

) WHERE RANKING1 = '1'

) WHERE RANG2 = '1'

AND DATE_COLUMN > SYSDATE

) WHERE RANKING3 = '1'

Tags: Database

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