This section will help you increase your knowledge of two of Azure open‐source products and features, as well as provide a summary of the storage of data along the Big [...]
–MODESELECT * FROM [dimensional].[MODE] WHERE [MODE_ID] = 2 Approaching the data discovery from the top down would indicate a desire to understand which mode is connected to which frequencies. Because [...]
df = spark.read.load(‘abfss://@.dfs.core.windows.net/in-path/file.csv’, df.write.mode(“overwrite”) \ df = spark.read.load(‘abfss://@.dfs.core.windows.net/out-path/file.parquet’, print(df.count()) from pyspark.sql.functions import year, month, col df = spark.read \ .load(‘abfss://@.dfs.core.windows.net/out-path/file.parquet’, format=’parquet’, header=True) df_year_month_day = (df.withColumn(“year”, year(col(“SESSION_DATETIME”)))) \ .withColumn(“month”, month(col(“SESSION_DATETIME”))) from [...]
No single folder structure fits every solution; what is considered a logically designed folder structure is relative. You have seen the following folder structures: Those folders are well suited for [...]
COLLATE Latin1_General_100_BIN2_UTF8 WITH (LOCATION = ‘abfss://@.dfs.core.windows.net’) WITH (FORMAT_TYPE = PARQUET) ([Timestamp] NVARCHAR(50),[AF3theta] NVARCHAR(50),[AF3alpha] NVARCHAR(50),[AF3betaL] NVARCHAR(50),…) WITH(LOCATION = ‘EMEA/brainjammer/out/2022/04/03//.parquet/*’,DATA_SOURCE = SampleBrainwavesSource,FILE_FORMAT = SampleBrainwavesParquet) FIGURE 4.33 Building an external table You might [...]
The serving layer is a component of the lambda architecture (refer to Figure 3.13). The serving layer is the place into which both the speed layer, which processes data incrementally, [...]
A flowlet is a container that holds reusable activities. Consider the activity you created in Exercise 4.8, which retrieves brain wave data and converts the epoch date into a more [...]
FIGURE 4.19 Azure Synapse Analytics Data hub ADLS directory FROM OPENROWSET( ) AS [result] FIGURE 4.20 Azure Synapse Analytics Data hub ADLS directory Notice in Figure 4.20 that the SQL [...]
EMEA/brainjammer/out/2022/04/03/17/sampleBrainwaves.parquet 3. Name the new integration dataset (I used sampleBrainwavesParquet) ➢ select the From Connection/Store radio button ➢ click OK ➢ return to the data flow ➢ click the Data [...]
When you provision an Azure Databricks workspace, an Azure storage account containing an Azure blob container used for storing your data is also provisioned. Figure 4.15 shows the details of [...]