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pull #30

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giorgio40 Mar 11, 2021
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Merge pull request #1 from giorgio40/giorgio40-patch-1
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69 changes: 52 additions & 17 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,9 @@ Reimport the Northwind database into PostgreSQL using pgAdmin. This is the same
</details>

```SQL

Select customer_id
from customers
where city = 'London'
```

* [ ] ***find all customers with postal code 1010. Returns 3 customers***
Expand All @@ -47,7 +49,9 @@ Reimport the Northwind database into PostgreSQL using pgAdmin. This is the same
* This can be done with SELECT and WHERE clauses
</details>

```SQL
```SQ Select customers
from customers
where postal_code = '1010'

```

Expand All @@ -58,7 +62,9 @@ Reimport the Northwind database into PostgreSQL using pgAdmin. This is the same
* This can be done with SELECT and WHERE clauses
</details>

```SQL
```SQL SELECT company_name ,phone
FROM suppliers
where supplier_id =11

```

Expand All @@ -69,7 +75,9 @@ Reimport the Northwind database into PostgreSQL using pgAdmin. This is the same
* This can be done with SELECT, WHERE, and ORDER BY clauses
</details>

```SQL
```SQL Select *
FROM orders
Where order_date = '1998-05-06'

```

Expand All @@ -81,7 +89,9 @@ Reimport the Northwind database into PostgreSQL using pgAdmin. This is the same
* You can use `length(company_name)` to get the length of the name
</details>

```SQL
```SQL SELECT company_name
From suppliers
Where LENGTH (company_name) >20

```

Expand All @@ -93,7 +103,9 @@ Reimport the Northwind database into PostgreSQL using pgAdmin. This is the same
* Don't forget the wildcard '%' symbols at the beginning and end of your substring to denote it can appear anywhere in the string in question
* Remember to convert your contact title to all upper case for case insensitive comparing so upper(contact_title)
</details>

SELECT contact_title
FROM customers
WHERE upper(contact_title) LIKE '%MARKET%';
```SQL

```
Expand All @@ -111,7 +123,8 @@ Reimport the Northwind database into PostgreSQL using pgAdmin. This is the same
* This can be done with the INSERT INTO clause
</details>

```SQL
```SQL INSERT INTO customers(customer_id,company_name,contact_name,address,city,postal_code, country)
VALUES('SHIRE','THE Shire','Bilbo Baggins','1 Hobbit-Hole','Bag End', 111,'Middle Earth')

```

Expand All @@ -122,7 +135,9 @@ Reimport the Northwind database into PostgreSQL using pgAdmin. This is the same
* This can be done with UPDATE and WHERE clauses
</details>

```SQL
```SQL UPDATE CUSTOMERS
SET postal_code = 11122
where customer_id = 'SHIRE'

```

Expand All @@ -134,7 +149,10 @@ Reimport the Northwind database into PostgreSQL using pgAdmin. This is the same
* There is more information about the COUNT clause on [W3 Schools](https://www.w3schools.com/sql/sql_count_avg_sum.asp)
</details>

```SQL
```SQL SELECT c.company_name Customer, COUNT(*)
FROM orders o JOIN customers c
ON c.customer_id = o.customer_id
GROUP BY c.company_name

```

Expand All @@ -144,7 +162,11 @@ Reimport the Northwind database into PostgreSQL using pgAdmin. This is the same

* This can be done by adding an ORDER BY clause to the previous answer and changing the group by field
</details>

SELECT c.contact_name contact, count(*)
FROM orders o JOIN customers c
ON c.customer_id = o.customer_id
GROUP BY c.contact_name
ORDER BY count desc
```SQL

```
Expand All @@ -156,7 +178,11 @@ Reimport the Northwind database into PostgreSQL using pgAdmin. This is the same
* This is very similar to the previous two queries, however, it focuses on the City rather than the Customer Names
</details>

```SQL
```SQLSELECT c.city city, count(*)
FROM orders o JOIN customers c
ON c.customer_id = o.customer_id
GROUP BY c.city
ORDER BY count desc

```

Expand All @@ -179,19 +205,28 @@ Below are some empty tables to be used to normalize the database

Table Name:

| | | | | | | | | |
| PET ID | PET TYPE | | | | | | | |
|------------|------------|------------|------------|------------|------------|------------|------------|------------|
| | | | | | | | | |
| | | | | | | | | |
| | | | | | | | | |
| | | | | | | | | |
| DOG | 1 | | | | | | | |
| HORSE 2
|CAT | 3 | | | | | | |
| TURTLE | 4 | | | | | | | |
| FISH | 5 | | | | | | | |
| | | | | | | | | |
| | | | | | | | | |
| | | | | | | | | |

Table Name:

| | | | | | | | | |
| Pet Type Pet Name Pet_type owner_id attribute_id
Ellie 1 1 4
Joe 2 2 1
Ginger 1 3 3
Tiger 3 1 4
Ms. Kitty 3 3 3
Toby 4 1 4
Bubble 5 3 3
| | | | | | | | |
|------------|------------|------------|------------|------------|------------|------------|------------|------------|
| | | | | | | | | |
| | | | | | | | | |
Expand Down