Getting started with SQL

Author: ayushi-b

Lesson 1 - Basic SQL.sql

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+/* 
+Write a query that limits the response to only the first 15 rows 
+and includes the occurred_at, account_id, and channel fields in 
+the web_events table.
+*/
+
+SELECT occurred_at, account_id, channel
+FROM web_events
+LIMIT 15;
+
+
+
+
+
+/*
+In order to gain some practice using ORDER BY:
+
+1. Write a query to return the 10 earliest orders in the orders table.
+Include the id, occurred_at, and total_amt_usd.
+
+2. Write a query to return the top 5 orders in terms of largest 
+total_amt_usd. Include the id, account_id, and total_amt_usd.
+
+3. Write a query to return the bottom 20 orders in terms of least total. 
+Include the id, account_id, and total.
+*/
+
+
+SELECT id, occurred_at, total_amt_usd
+FROM orders
+ORDER BY occurred_at
+LIMIT 10;
+
+SELECT id, account_id, total_amt_usd
+FROM orders
+ORDER BY total_amt_usd DESC
+LIMIT 5;
+
+SELECT id, account_id, total
+FROM orders
+ORDER BY total
+LIMIT 20;
+
+
+
+
+
+/*
+1. Write a query that returns the top 5 rows from orders ordered according 
+to newest to oldest, but with the largest total_amt_usd for each date 
+listed first for each date.
+
+2. Write a query that returns the top 10 rows from orders ordered according 
+to oldest to newest, but with the smallest total_amt_usd for each date 
+listed first for each date. 
+*/
+
+SELECT *
+FROM orders
+ORDER BY occurred_at DESC, total_amt_usd DESC
+LIMIT 5;
+
+SELECT *
+FROM orders
+ORDER BY occurred_at, total_amt_usd
+LIMIT 10;
+
+
+
+
+
+/*
+Write a query that
+
+1. Pull the first 5 rows and all columns from the orders table that have a 
+dollar amount of gloss_amt_usd greater than or equal to 1000.
+
+2. Pull the first 10 rows and all columns from the orders table that have a 
+total_amt_usd less than 500.
+*/
+
+SELECT *
+FROM orders
+WHERE gloss_amt_usd >= 1000
+LIMIT 5;
+
+SELECT *
+FROM orders
+WHERE total_amt_usd < 500
+LIMIT 10;
+
+
+
+
+
+/*
+Filter the accounts table to include the company name, website, and the primary 
+point of contact (primary_poc) for Exxon Mobil in the accounts table.
+*/
+
+SELECT name, website, primary_poc
+FROM accounts
+WHERE name = 'Exxon Mobil';
+
+
+
+
+
+/*
+Using the orders table:
+
+1. Create a column that divides the standard_amt_usd by the standard_qty to find 
+the unit price for standard paper for each order. Limit the results to the first 
+10 orders, and include the id and account_id fields. 
+
+2. Write a query that finds the percentage of revenue that comes from poster paper 
+for each order. You will need to use only the columns that end with _usd. (Try to do 
+this without using the total column). Include the id and account_id fields.
+*/
+
+# DERIVED COLUMNS
+SELECT id, account_id, 
+	standard_amt_usd/standard_qty as unit_price
+FROM orders
+LIMIT 10;
+
+SELECT id, account_id,
+	 poster_amt_usd/(poster_amt_usd + gloss_amt_usd + standard_amt_usd + 1e-10) as poster_paper_revenue
+FROM orders;
+
+
+
+
+
+/*
+Use the accounts table to find
+
+1. All the companies whose names start with 'C'. 
+
+2. All companies whose names contain the string 'one' somewhere in the name.
+
+3. All companies whose names end with 's'.
+*/
+
+# LIKE with %
+SELECT *
+FROM accounts
+WHERE name LIKE 'C%';
+
+SELECT *
+FROM accounts
+WHERE name LIKE '%one%';
+
+SELECT *
+FROM accounts
+WHERE name LIKE '%s';
+
+
+
+
+
+/*
+1. Use the accounts table to find the account name, primary_poc, and sales_rep_id 
+for Walmart, Target, and Nordstrom.
+
+2. Use the web_events table to find all information regarding individuals who were 
+contacted via the channel of organic or adwords.
+*/
+
+# IN clause
+SELECT name, primary_poc, sales_rep_id
+FROM accounts
+WHERE name IN ('Walmart', 'Target', 'Nordstrom');
+
+SELECT *
+FROM web_events
+WHERE channel IN ('organic', 'adwords');
+
+
+
+
+
+/*
+We can pull all of the rows that were excluded from the queries in the previous two 
+concepts with our new operator.
+
+1. Use the accounts table to find the account name, primary poc, and sales rep id for 
+all stores except Walmart, Target, and Nordstrom.
+
+2. Use the web_events table to find all information regarding individuals who were 
+contacted via any method except using organic or adwords methods.
+
+Use the accounts table to find:
+
+3. All the companies whose names do not start with 'C'.
+
+4. All companies whose names do not contain the string 'one' somewhere in the name.
+
+5. All companies whose names do not end with 's'.
+*/
+
+# NOT clause
+SELECT name, primary_poc, sales_rep_id
+FROM accounts
+WHERE name NOT IN ('Walmart', 'Target', 'Nordstrom');
+
+SELECT *
+FROM web_events
+WHERE channel NOT IN ('organic', 'adwords');
+
+SELECT *
+FROM accounts
+WHERE name NOT LIKE 'C%';
+
+SELECT *
+FROM accounts
+WHERE name NOT LIKE '%one%';
+
+SELECT *
+FROM accounts
+WHERE name NOT LIKE '%s';
+
+
+
+
+
+/*
+1. Write a query that returns all the orders where the standard_qty is over 1000, the 
+poster_qty is 0, and the gloss_qty is 0.
+
+2. Using the accounts table find all the companies whose names do not start with 'C' and 
+end with 's'.
+
+3. Use the web_events table to find all information regarding individuals who were 
+contacted via organic or adwords and started their account at any point in 2016 sorted 
+from newest to oldest.
+*/
+
+# AND and BETWEEN
+SELECT *
+FROM orders
+WHERE standard_qty > 1000 and 
+	poster_qty = 0 and 
+	gloss_qty = 0;
+
+
+SELECT *
+FROM accounts
+WHERE name NOT LIKE 'C%' and 
+	name NOT LIKE '%s' ;
+
+
+SELECT *
+FROM web_events
+WHERE channel IN ('organic', 'adwords') 
+	AND occurred_at BETWEEN '2016-01-01' AND '2017-01-01'
+ORDER BY occurred_at DESC;
+
+
+
+
+
+/*
+1. Find list of orders ids where either gloss_qty or poster_qty is greater than 4000. Only 
+include the id field in the resulting table.
+
+2. Write a query that returns a list of orders where the standard_qty is zero and either 
+the gloss_qty or poster_qty is over 1000.
+
+3. Find all the company names that start with a 'C' or 'W', and the primary contact contains 
+'ana' or 'Ana', but it doesn't contain 'eana'.
+
+*/
+
+# OR clause
+SELECT id
+FROM orders
+WHERE gloss_qty > 4000 
+	OR poster_qty > 4000;
+
+
+SELECT *
+FROM orders
+WHERE (gloss_qty > 1000 OR poster_qty > 1000)
+    AND standard_qty = 0;
+
+
+
+SELECT *
+FROM accounts
+WHERE (name LIKE 'C%' OR name LIKE 'W%')
+    AND ((primary_poc LIKE '%ana%' OR primary_poc LIKE '%Ana%')
+    AND primary_poc NOT LIKE '%eana%');
+
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