Demo queries from slides

demo-queries-from slides-1.sql

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+SELECT COUNT(*) AS number_of_invoices,
+    SUM(invoice_total - payment_total - credit_total) AS total_due
+FROM invoices
+WHERE invoice_total - payment_total - credit_total > 0;

demo-queries-from slides-2.sql

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+SELECT 'After 1/1/2018' AS selection_date, 
+    COUNT(*) AS number_of_invoices,
+    ROUND(AVG(invoice_total), 2) AS avg_invoice_amt,
+    SUM(invoice_total) AS total_invoice_amt
+FROM invoices
+WHERE invoice_date > '2018-01-01';
+
+SELECT 'After 1/1/2018' AS selection_date, 
+    COUNT(*) AS number_of_invoices,
+    MAX(invoice_total) AS highest_invoice_total,
+    MIN(invoice_total) AS lowest_invoice_total
+FROM invoices
+WHERE invoice_date > '2018-01-01';
+
+SELECT MIN(vendor_name) AS first_vendor,
+    MAX(vendor_name) AS last_vendor,
+    COUNT(vendor_name) AS number_of_vendors
+FROM vendors;
+
+SELECT COUNT(DISTINCT vendor_id) AS number_of_vendors,
+    COUNT(vendor_id) AS number_of_invoices,
+    ROUND(AVG(invoice_total), 2) AS avg_invoice_amt,
+    SUM(invoice_total) AS total_invoice_amt
+FROM invoices
+WHERE invoice_date > '2018-01-01';

demo-queries-from slides-3.sql

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+SELECT vendor_id, ROUND(AVG(invoice_total), 2) AS average_invoice_amount
+FROM invoices
+GROUP BY vendor_id
+HAVING AVG(invoice_total) > 2000
+ORDER BY average_invoice_amount DESC;
+
+SELECT vendor_name, vendor_state, ROUND(AVG(invoice_total), 2) AS average_invoice_amount
+FROM vendors JOIN invoices ON vendors.vendor_id = invoices.vendor_id
+GROUP BY vendor_name
+HAVING AVG(invoice_total) > 2000
+ORDER BY average_invoice_amount DESC;

demo-queries-from slides-4.sql

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+SELECT vendor_id, COUNT(*) AS invoice_qty
+FROM invoices
+GROUP BY vendor_id;
+
+SELECT vendor_state, vendor_city, COUNT(*) AS invoice_qty,
+    ROUND(AVG(invoice_total), 2) AS invoice_avg
+FROM invoices JOIN vendors
+    ON invoices.vendor_id = vendors.vendor_id
+GROUP BY vendor_state, vendor_city
+ORDER BY vendor_state, vendor_city;
+
+SELECT vendor_state, vendor_city, COUNT(*) AS invoice_qty,
+    ROUND(AVG(invoice_total), 2) AS invoice_avg
+FROM invoices JOIN vendors
+    ON invoices.vendor_id = vendors.vendor_id
+GROUP BY vendor_state, vendor_city
+HAVING COUNT(*) >= 2
+ORDER BY vendor_state, vendor_city;

demo-queries-from slides-5.sql

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+SELECT vendor_name, 
+    COUNT(*) AS invoice_qty,
+    ROUND(AVG(invoice_total), 2) AS invoice_avg
+FROM vendors JOIN invoices
+    ON vendors.vendor_id = invoices.vendor_id
+GROUP BY vendor_name
+HAVING AVG(invoice_total) > 500
+ORDER BY invoice_qty DESC;
+
+SELECT vendor_name, 
+    COUNT(*) AS invoice_qty,
+    ROUND(AVG(invoice_total), 2) AS invoice_avg
+FROM vendors JOIN invoices
+    ON vendors.vendor_id = invoices.vendor_id
+WHERE invoice_total > 500
+GROUP BY vendor_name
+ORDER BY invoice_qty DESC;

demo-queries-from slides-6.sql

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+SELECT 
+    invoice_date,
+    COUNT(*) AS invoice_qty,
+    SUM(invoice_total) AS invoice_sum
+FROM invoices
+GROUP BY invoice_date
+HAVING invoice_date BETWEEN '2018-05-01' AND '2018-05-31'
+    AND COUNT(*) > 1
+    AND SUM(invoice_total) > 100
+ORDER BY invoice_date DESC;
+
+SELECT 
+    invoice_date,
+    COUNT(*) AS invoice_qty,
+    SUM(invoice_total) AS invoice_sum
+FROM invoices
+WHERE invoice_date BETWEEN '2018-05-01' AND '2018-05-31'
+GROUP BY invoice_date
+HAVING COUNT(*) > 1 
+    AND SUM(invoice_total) > 100
+ORDER BY invoice_date DESC;

demo-queries-from slides-7.sql

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+SELECT vendor_id, COUNT(*) AS invoice_count,
+    SUM(invoice_total) AS invoice_total
+FROM invoices
+GROUP BY vendor_id WITH ROLLUP;
+
+SELECT vendor_state, vendor_city, COUNT(*) AS qty_vendors
+FROM vendors
+WHERE vendor_state IN ('IA', 'NJ')
+GROUP BY vendor_state, vendor_city WITH ROLLUP;