Update tutorial-data-analyst.md

Author: jovanpop-msft

articles/synapse-analytics/sql/tutorial-data-analyst.md

@@ -19,24 +19,14 @@ In particular, you analyze the [New York City (NYC) Taxi dataset](https://azure.
 
 The focus of the analysis is to find trends in changes of number of taxi rides over time. You analyze two other Azure Open Datasets ([Public Holidays](https://azure.microsoft.com/services/open-datasets/catalog/public-holidays/) and [Weather Data](https://azure.microsoft.com/services/open-datasets/catalog/noaa-integrated-surface-data/)) to understand the outliers in number of taxi rides.
 
-## Create credentials
+## Create Data source
+
+Data source object is used to reference Azure storage account where you need to analyze data. Public Azure storage don't need some credential to acces storage.
 
 ```sql
--- There is no secret. We are using public storage account which doesn't need a secret.
-CREATE CREDENTIAL [https://azureopendatastorage.blob.core.windows.net/nyctlc]
-WITH IDENTITY='SHARED ACCESS SIGNATURE',
-SECRET = ''
-GO
-
-CREATE CREDENTIAL [https://azureopendatastorage.blob.core.windows.net/holidaydatacontainer]
-WITH IDENTITY='SHARED ACCESS SIGNATURE',
-SECRET = ''
-GO
-
-CREATE CREDENTIAL [https://azureopendatastorage.blob.core.windows.net/isdweatherdatacontainer]
-WITH IDENTITY='SHARED ACCESS SIGNATURE',
-SECRET = ''
-GO
+-- There is no credential in data surce. We are using public storage account which doesn't need a secret.
+CREATE EXTERNAL DATA SOURCE AzureOpenData
+WITH ( LOCATION = 'https://azureopendatastorage.blob.core.windows.net/')
 ```
 
 ## Automatic schema inference
@@ -48,7 +38,8 @@ Let's first familiarize with the NYC Taxi data by running the following query:
 ```sql
 SELECT TOP 100 * FROM
     OPENROWSET(
-        BULK 'https://azureopendatastorage.blob.core.windows.net/nyctlc/yellow/puYear=*/puMonth=*/*.parquet',
+        BULK 'nyctlc/yellow/puYear=*/puMonth=*/*.parquet',
+        DATA_SOURCE = 'AzureOpenData',
         FORMAT='PARQUET'
     ) AS [nyc]
 ```
@@ -62,7 +53,8 @@ Similarly, we can query the public holidays dataset using the following query:
 ```sql
 SELECT TOP 100 * FROM
     OPENROWSET(
-        BULK 'https://azureopendatastorage.blob.core.windows.net/holidaydatacontainer/Processed/*.parquet',
+        BULK 'holidaydatacontainer/Processed/*.parquet',
+        DATA_SOURCE = 'AzureOpenData',
         FORMAT='PARQUET'
     ) AS [holidays]
 ```
@@ -78,7 +70,8 @@ SELECT
     TOP 100 *
 FROM  
     OPENROWSET(
-        BULK 'https://azureopendatastorage.blob.core.windows.net/isdweatherdatacontainer/ISDWeather/year=*/month=*/*.parquet',
+        BULK 'isdweatherdatacontainer/ISDWeather/year=*/month=*/*.parquet',
+        DATA_SOURCE = 'AzureOpenData',
         FORMAT='PARQUET'
     ) AS [weather]
 ```
@@ -99,7 +92,8 @@ SELECT
     COUNT(*) AS rides_per_year
 FROM
     OPENROWSET(
-        BULK 'https://azureopendatastorage.blob.core.windows.net/nyctlc/yellow/puYear=*/puMonth=*/*.parquet',
+        BULK 'nyctlc/yellow/puYear=*/puMonth=*/*.parquet',
+        DATA_SOURCE = 'AzureOpenData',
         FORMAT='PARQUET'
     ) AS [nyc]
 WHERE nyc.filepath(1) >= '2009' AND nyc.filepath(1) <= '2019'
@@ -128,7 +122,8 @@ SELECT
     COUNT(*) as rides_per_day
 FROM
     OPENROWSET(
-        BULK 'https://azureopendatastorage.blob.core.windows.net/nyctlc/yellow/puYear=*/puMonth=*/*.parquet',
+        BULK 'nyctlc/yellow/puYear=*/puMonth=*/*.parquet',
+        DATA_SOURCE = 'AzureOpenData',
         FORMAT='PARQUET'
     ) AS [nyc]
 WHERE nyc.filepath(1) = '2016'
@@ -156,7 +151,8 @@ WITH taxi_rides AS
         COUNT(*) as rides_per_day
     FROM  
         OPENROWSET(
-            BULK 'https://azureopendatastorage.blob.core.windows.net/nyctlc/yellow/puYear=*/puMonth=*/*.parquet',
+            BULK 'nyctlc/yellow/puYear=*/puMonth=*/*.parquet',
+            DATA_SOURCE = 'AzureOpenData',
             FORMAT='PARQUET'
         ) AS [nyc]
     WHERE nyc.filepath(1) = '2016'
@@ -169,7 +165,8 @@ public_holidays AS
         date
     FROM
         OPENROWSET(
-            BULK 'https://azureopendatastorage.blob.core.windows.net/holidaydatacontainer/Processed/*.parquet',
+            BULK 'holidaydatacontainer/Processed/*.parquet',
+            DATA_SOURCE = 'AzureOpenData',
             FORMAT='PARQUET'
         ) AS [holidays]
     WHERE countryorregion = 'United States' AND YEAR(date) = 2016
@@ -208,7 +205,8 @@ SELECT
     MAX(snowdepth) AS max_snowdepth
 FROM
     OPENROWSET(
-        BULK 'https://azureopendatastorage.blob.core.windows.net/isdweatherdatacontainer/ISDWeather/year=*/month=*/*.parquet',
+        BULK 'isdweatherdatacontainer/ISDWeather/year=*/month=*/*.parquet',
+        DATA_SOURCE = 'AzureOpenData',
         FORMAT='PARQUET'
     ) AS [weather]
 WHERE countryorregion = 'US' AND CAST([datetime] AS DATE) = '2016-01-23' AND stationname = 'JOHN F KENNEDY INTERNATIONAL AIRPORT'