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sql group by
# Say you have a table called SALARIES that contains a
# few duplicate NAME entries...
+----+-------------+--------+
| ID | NAME | SALARY |
+----+-------------+--------+
| 1 | Bob | 500 |
| 2 | Alice | 500 |
| 3 | Alice | 200 |
| 4 | Frank | 700 |
| 5 | Percy | 100 |
| 6 | Percy | 800 |
| 7 | Cyrille | 400 |
+----+-------------+--------+
# We can obtain the total salaries of each person
# by using GROUP BY in the following query...
SELECT NAME, SALARY FROM SALARIES GROUP BY NAME;
# Which will output the following...
+------------+--------+
| Alice | 700 |
| Bob | 500 |
| Cyrille | 400 |
| Frank | 700 |
| Percy | 900 |
+------------+--------+
grouping sql
SELECT SalesQuota, SUM(SalesYTD) 'TotalSalesYTD', GROUPING(SalesQuota) AS 'Grouping'
FROM Sales.SalesPerson
GROUP BY SalesQuota WITH ROLLUP;
GO
Source: docs.microsoft.com
sql group by example
SELECT column_name(s)
FROM table_name
WHERE condition
GROUP BY column_name(s)
HAVING condition
ORDER BY column_name(s);
group function in sql
--- GROUP FUNCTION | MULTI ROW FUNCTION | AGGREGATE FUNCTION
--- COUNT , MAX , MIN , SUM , AVG
GROUPING Functions
-- It accepts a single column as a parameter and returns "1"
-- if the column contains a null value generated as part of a
-- subtotal by a ROLLUP or CUBE operation or "0" for any other value,
-- including stored null values
SELECT fact_1_id,
fact_2_id,
SUM(sales_value) AS sales_value,
GROUPING(fact_1_id) AS f1g,
GROUPING(fact_2_id) AS f2g
FROM dimension_tab
GROUP BY CUBE (fact_1_id, fact_2_id)
HAVING GROUPING(fact_1_id) = 1 OR GROUPING(fact_2_id) = 1
ORDER BY GROUPING(fact_1_id), GROUPING(fact_2_id);
GROUP BY
SELECT <field1, field2, field3…>
FROM <table1_name>
WHERE <condition/expression>
GROUP BY <field1, field2, field3…>
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