Sometimes you want to get some numbers and also percentages for quick analysis. This is a quick simple way to get quick overviews
Sometimes you want to get some numbers and also percentages for quick analysis. This is a quick simple way to get quick overviews
Analysing ‘Big Data’ from a database with real world data requires retrieving data from the database by writing relevant queries. As part of “Managing Big Data with MySQL” by Duke University on Cousera, I dealt with real world data that comprise hundreds to millions of entries/rows. This is the database of Dillard’s Department stores, specifically, the UA_DILLARDS that contains…
Summarizing Data This week we are looking at five most common aggregate functions used to summarize information stored in tables: COUNT and SUM very frequently. COUNT is the only aggregate function that can work on any type of variable. The other four aggregate functions are only appropriate for numerical data. All aggregate functions require you…
This is a sample code to use Python to connect to SQL Server Native Client. import sqlalchemy import pyodbc try: import urllib params = urllib.quote_plus(“DRIVER={SQL Server Native Client 11.0};SERVER=.\MSSQLSERVER_ENT;DATABASE=MagicDirect;Trusted_Connection=yes;”) engine = sqlalchemy.create_engine(‘mssql+pyodbc:///?odbc_connect=%s”‘ % params) results.to_sql(“clusterSegments”, engine, if_exists = ‘replace’)# except (RuntimeError, TypeError, NameError): print(‘Error in Conneccting’) print(RuntimeError, TypeError, NameError) finally: print(“connected”) People Who Read The…
ERDPLUS One tool I generally use when working on a projects, mini tasks and exploration is the ERDPLUS tool . It is quite simple and easy to use. It is a Free tool as well. Below are some diagrams I generated when i first got in contact with with tool. ERD DIAGRAMS: 1. 2. A…
I receive a lot of emails about where to get quick and excellent resources for explaining most of the concepts of Transact-SQL (T SQL) and Microsoft SQL Server in general What is Transact-SQL or T SQL. T-SQL (Transact-SQL) is a set of programming extensions from Sybase and Microsoft that add several features to the Structured Query…
Sometimes, you would want to split values in a column into separate rows in SQL server. This is a simple guide. Lets check the fields in the table we will be working with. select [orderID] ,[itemType] ,[price] ,[quantity] from [Antrak].[dbo].[ClothingSale] Let’s check the result: We can see that the itemType field has different values…
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