﻿ AdventureWorks: Find the differences in sales quota for the next quarters

# AdventureWorks Database: Find the differences in sales quota for the next quarters

## SQL Query - AdventureWorks: Exercise-111 with Solution

111. From the following table write a query in SQL to obtain the difference in sales quota values for a specified employee over subsequent calendar quarters. Return year, quarter, sales quota, next sales quota, and the difference in sales quota. Sort the result set on year and then by quarter, both in ascending order.

Sample table: Sales.SalesPersonQuotaHistory

Click to view Full table

Sample Solution:

``````SELECT date_part('year',quotadate) AS Year, date_part('quarter',quotadate) AS Quarter, SalesQuota AS SalesQuota,
FROM sales.salespersonquotahistory
``````

Sample Output:

```year  |quarter|salesquota|nextquota|diff   |
------+-------+----------+---------+-------+
2012.0|    1.0|    952000|  1600000|-648000|
2012.0|    2.0|   1600000|  1352000| 248000|
2012.0|    3.0|   1352000|   839000| 513000|
2012.0|    4.0|    839000|  1369000|-530000|
2013.0|    1.0|   1369000|  1171000| 198000|
2013.0|    2.0|   1171000|   971000| 200000|
2013.0|    3.0|    971000|   714000| 257000|
```

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## SQL: Tips of the Day

How to request a random row in SQL?

Select a random row with MySQL:

```SELECT column FROM table
ORDER BY RAND()
LIMIT 1
```

Select a random row with PostgreSQL:

```SELECT column FROM table
ORDER BY RANDOM()
LIMIT 1
```

Select a random row with Microsoft SQL Server:

```SELECT TOP 1 column FROM table
ORDER BY NEWID()
```

Select a random row with IBM DB2:

```SELECT column, RAND() as IDX
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ORDER BY IDX FETCH FIRST 1 ROWS ONLY
```

Select a random record with Oracle:

```SELECT column FROM
( SELECT column FROM table
ORDER BY dbms_random.value )
WHERE rownum = 1
```

Database: SQL Server, PostgreSQL Server, MySQL

Ref: https://bit.ly/39n35HP

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