diff --git a/Creating a Data Warehouse Through Joins and Unions b/Creating a Data Warehouse Through Joins and Unions
new file mode 100644
index 0000000..43f4cd8
--- /dev/null
+++ b/Creating a Data Warehouse Through Joins and Unions	
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+bq mk ecommerce
+bq query --use_legacy_sql=false \
+'create or replace TABLE ecommerce.products AS
+SELECT
+*
+FROM
+`data-to-insights.ecommerce.products`'
+bq query --use_legacy_sql=false \
+'SELECT
+  SKU,
+  name,
+  sentimentScore,
+  sentimentMagnitude
+FROM
+  `data-to-insights.ecommerce.products`
+ORDER BY
+  sentimentScore DESC
+LIMIT 5'
+bq query --use_legacy_sql=false \
+'SELECT
+  SKU,
+  name,
+  sentimentScore,
+  sentimentMagnitude
+FROM
+  `data-to-insights.ecommerce.products`
+WHERE sentimentScore IS NOT NULL
+ORDER BY
+  sentimentScore
+LIMIT 5'
+bq query --use_legacy_sql=false \
+"CREATE OR REPLACE TABLE ecommerce.sales_by_sku_20170801 AS
+SELECT
+  productSKU,
+  SUM(IFNULL(productQuantity, 0)) AS total_ordered
+FROM
+  \`data-to-insights.ecommerce.all_sessions_raw\`
+WHERE
+  date = '20170801'
+GROUP BY
+  productSKU
+ORDER BY
+  total_ordered DESC"
+bq query --use_legacy_sql=false \
+'CREATE TABLE IF NOT EXISTS ecommerce.sales_by_sku_20170801 AS
+SELECT
+  productSKU,
+  SUM(IFNULL(productQuantity,0)) AS total_ordered
+FROM
+  `data-to-insights.ecommerce.all_sessions_raw`
+WHERE date = "20170801"
+GROUP BY productSKU
+ORDER BY total_ordered DESC'
+bq query --use_legacy_sql=false \
+'# join against product inventory to get name
+SELECT DISTINCT
+  website.productSKU,
+  website.total_ordered,
+  inventory.name,
+  inventory.stockLevel,
+  inventory.restockingLeadTime,
+  inventory.sentimentScore,
+  inventory.sentimentMagnitude
+FROM
+  ecommerce.sales_by_sku_20170801 AS website
+  LEFT JOIN `data-to-insights.ecommerce.products` AS inventory
+  ON website.productSKU = inventory.SKU
+ORDER BY total_ordered DESC'
+bq query --use_legacy_sql=false \
+'# calculate ratio and filter
+SELECT DISTINCT
+  website.productSKU,
+  website.total_ordered,
+  inventory.name,
+  inventory.stockLevel,
+  inventory.restockingLeadTime,
+  inventory.sentimentScore,
+  inventory.sentimentMagnitude,
+  SAFE_DIVIDE(website.total_ordered, inventory.stockLevel) AS ratio
+FROM
+  ecommerce.sales_by_sku_20170801 AS website
+  LEFT JOIN `data-to-insights.ecommerce.products` AS inventory
+  ON website.productSKU = inventory.SKU
+# gone through more than 50% of inventory for the month
+WHERE SAFE_DIVIDE(website.total_ordered,inventory.stockLevel) >= .50
+ORDER BY total_ordered DESC'
+bq query --use_legacy_sql=false \
+'CREATE OR REPLACE TABLE ecommerce.sales_by_sku_20170802
+(
+productSKU STRING,
+total_ordered INT64
+);'
+bq query --use_legacy_sql=false \
+"INSERT INTO ecommerce.sales_by_sku_20170802
+(productSKU, total_ordered)
+VALUES('GGOEGHPA002910', 101)"
+bq query --use_legacy_sql=false \
+'SELECT * FROM ecommerce.sales_by_sku_20170801
+UNION ALL
+SELECT * FROM ecommerce.sales_by_sku_20170802'
+bq query --use_legacy_sql=false \
+"SELECT * FROM \`ecommerce.sales_by_sku_2017*\`
+WHERE _TABLE_SUFFIX = '0802'"