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? ??? ??? MySQL ???? 'KEEP' ?? Oracle ?? ??? 'PARTITION BY'? ?? ??? ?????

'KEEP' ?? Oracle ?? ??? 'PARTITION BY'? ?? ??? ?????

Dec 29, 2024 pm 09:06 PM

How Does the `KEEP` Clause Affect `PARTITION BY` in Oracle Aggregate Functions?

Oracle?? KEEP? ??? ?? PARTITION BY

Oracle? PARTITION BY ?? ???? ???? ?? ????? ?? ??? ??? ? ????. ? ???. KEEP ?? PARTITION BY ?? ?? ???? ?? ??? ??? ? ??? ?? ??? ? ????.

?? ? ??? ?????.

SELECT empno,
   deptno,
   sal,
   MIN(sal) OVER (PARTITION BY deptno) "Lowest",
   MAX(sal) OVER (PARTITION BY deptno) "Highest"
FROM empl

SELECT empno,
   deptno,
   sal,
   MIN(sal) KEEP (DENSE_RANK FIRST ORDER BY sal) OVER (PARTITION BY deptno) "Lowest",
   MAX(sal) KEEP (DENSE_RANK LAST ORDER BY sal) OVER (PARTITION BY deptno) "Highest"
FROM empl

? ?? ?? ??? ??? ???? ? ??? ?? ??? ?? ??? ?????. ??? ? ???? ??? ??? ????.

? ?? ????? ? ???? ?? ?? MIN ? MAX ??? ?????. ? ?? ????? KEEP ?? ???? ? ???? ? ?? ?? ??? ?? ??? ????? ?????.

KEEP ?? ?? ?? ??? ?? ??? ? ????. ? ???? ?? ?? ?? ????? ???? ??? ?? ?????.

?? ?? ?? ??? ? ???? ??? ?? ?? ??? ??? ?? ????. :

SELECT empno,
   deptno,
   sal,
   MIN(name) KEEP (DENSE_RANK FIRST ORDER BY sal) OVER (PARTITION BY deptno) AS "First Highest Salary",
   MAX(name) KEEP (DENSE_RANK LAST ORDER BY sal) OVER (PARTITION BY deptno) AS "Last Highest Salary"
FROM empl
GROUP BY deptno

KEEP ?? ???? ??? ???? ?? ????. ? ???? ? ?? ?? ??? ?? ??? ????? ???? ???????? ???? ?? ??? ?? ?? ? ????. ?? ?? ??? ??? ??? ???? ?? ?? ??? ???? ? ????.

? ??? 'KEEP' ?? Oracle ?? ??? 'PARTITION BY'? ?? ??? ?????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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