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Gruppo di SQL da Statement

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Gruppo dalla clausola

Quando le funzioni aggregate (come la SOMMA) la hanno denominata ritorno il complesso di tutta la colonna stima. Era impossible da trovare la somma per ogni gruppo specifico dei valori della colonna in modo da il gruppo dalla clausola ha usato.




Sintassi:

SELECT "column_name1", SUM("column_name2") FROM "table_name" GROUP BY "column_name1"

la tabella seguente �Store_Information�

Store_name Sales Date
Los Angeles $1500 Jan-05-2005
San Diego $250 Jan-07-2005
Los Angeles $300 Jan-08-2005
Boston $700 Jan-08-2005

Per trovare le vendite totali per ogni deposito: -

SELECT store_name, SUM(Sales)
FROM Store_Information
GROUP BY store_name

Uscita

Store_name SUM(Sales)
Los Angeles $1800
San Diego $250
Boston $700

Il GRUPPO dalla parola chiave � usato quando seleziona le colonne multiple a partire dalle tabelle ed almeno un operatore aritmetico compare nella dichiarazione PRESCELTA.


Avere clausola

Per limitare l'uscita basata sulla somma corrispondente (o su qualsiasi altre funzioni del complesso). Per esempio, potremmo desiderare vedere soltanto i depositi con le vendite oltre $1.500. Invece di usando DOVE clausola nella dichiarazione di SQL, bench�, dobbiamo usare AVERE clausola, che � riservata per le funzioni aggregate. AVERE clausola � disposto vicino alla conclusione della dichiarazione di SQL. La dichiarazione di SQL con AVERE clausola pu� o meno includere il GRUPPO dalla clausola.

Sintassi: Avere clausola

SELECT "column_name1", SUM("column_name2")
FROM "table_name"
GROUP BY "column_name1"
HAVING (arithmetic function condition)

Nel nostro esempio, tabella �Store_Information� che scriveremmo.

SELECT store_name, SUM(sales)
FROM Store_Information
GROUP BY store_name
HAVING SUM(sales) > 1500

Uscita

store_name SUM(Sales)
Los Angeles $1800



Previous Next

Keywords sql group by clause, sql group by sum, sql server, sql tutorial


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