?? SELECT ??? DISTINCT ? ORDER BY ??
SQL ?? ?? ? DISTINCT? ???? ?? ?? ???? ??? ???? ??? ???? ?? ???? ? ????. ?????. ??? ?? ??? ??? ?? ?? ????? ?? ??? ?? ??? ??? ? ????. ? ????? ? ??? ??? ???? ??? ?? ???? ???? ?? ???? ?????.
?? ??
?? ??? ?????.
SELECT Category FROM MonitoringJob ORDER BY CreationDate DESC;
? ??? ??? ?????. CreationDate ?? ???? ?????? ??? ?????. ??? Category ?? ?? ?? ????? ???? ????.
??? ????? DISTINCT ???? ??? ? ? ????.
SELECT DISTINCT Category FROM MonitoringJob ORDER BY CreationDate DESC;
??? ? ??? DISTINCT? ?? ?? ???? ?? ???? ORDER BY? ???? ???? ??? ?? ?????.
???
? ??? ????? GROUP BY ?? ?? ?? ??? ???? Category ?? ???? ??? ??????. ??? ?? DISTINCT ???? ??? ?? ?? ???? ??? ORDER BY ?? CreationDate ?? ???? ??? ??? ? ????.
SELECT DISTINCT Category, MAX(CreationDate) FROM MonitoringJob GROUP BY Category ORDER BY MAX(CreationDate) DESC, Category;
? ????:
- MAX (CreationDate)? ? ????? ?? CreationDate? ???? ??? ???? ? ???? ?? ?????.
- GROUP BY Category? Category ?? ???? ??? ????? DISTINCT? ??? ???? ?? ??? ? ??? ???.
- ORDER BY MAX(CreationDate) DESC, Category? ?? ? ???? ?? ?? CreationDate? ???? ??? ??? ?? Category ??? ???? ?????? ??? ?????. .
? ??? ?? SQL SELECT ??? DISTINCT? ORDER BY? ??? ?? ??? ? ????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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