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Articles on Trending Technologies
Technical articles with clear explanations and examples
Statistical Thinking in Python
Statistics is fundamental to learn ml and AI. As Python is the language of choice for these Technologies, we will see how to write Python programs which incorporate statistical analysis. In this article we will see how to create graphs and charts using various Python modules. This variety of charts help us in analyzing the data quickly and deriving insides are conclusions graphically.Data PreparationWe take the data set containing the data about various seeds. This data set is available at kaggle in the link shown in the program below. It has eight columns which will be used to cerate various ...
Read MoreWhat is the use of escape character () in text file while importing the data from text file to MySQL table?
Use of escape character (\) would become very essential when we want to insert a comma or any other character between the values of a filed. It can be understood with the help of an example. Suppose we want to import the data from a text file named A.txt, having the following data, into a MySQL table −id, Name, Country, Salary 105, Chum, Marsh, USA, 11000 106, Danny, Harrison, AUS, 12000Here, we can see that the filed name has two values first name, last name separated by a comma. Now, the ...
Read MoreHow can we use MySQL INSTR() function with WHERE clause?
When we use INSTR() function with MySQL WHERE clause, we need to provide column name of the table as the first argument and the substring as second argument along with a comparison operator. Following is an example using ‘Student’ table to demonstrate it −ExampleSuppose we have the following values in ‘Student’ table −mysql> Select * from Student; +------+---------+---------+-----------+ | Id | Name | Address | Subject | +------+---------+---------+-----------+ | 1 | Gaurav | Delhi | Computers | | 2 | Aarav | Mumbai | History | | 15 | Harshit | ...
Read MoreHow can we import the text file, having data on the same line with a separator, into MySQL table?
Actually, we can write the data on the same line in the text file by using a separator. In this case, while importing this text file into MySQL table then we must have to use ‘LINES TERMINATED BY’ option. It can be understood with the help of the following example −Suppose we are using ‘|’ as the LINE TERMINATOR symbol in a text file as follows −id, Name, Country, Salary|105, Chum*, Marsh, USA, 11000|106, Danny*, Harrison, AUS, 12000Now while importing this text file into MySQL table then we need to mention ‘LINE TERMINATED BY’ option also in the query as ...
Read MorePredicting Customer Churn in Python
Every business depends on customer's loyalty. The repeat business from customer is one of the cornerstone for business profitability. So it is important to know the reason of customers leaving a business. Customers going away is known as customer churn. By looking at the past trends we can judge what factors influence customer churn and how to predict if a particular customer will go away from the business. In this article we will use ML algorithm to study the past trends in customer churn and then judge which customers are likely to churn.Data PreparationAs an example will consider the Telecom ...
Read MoreHow can we import only specific columns from the text file, into MySQL table?
Suppose if we have the values for some specific columns in the text file and MySQL table, in which we want to import the data, is having an extra column(s) then by mentioning the names of the columns in the query we can upload the values of those specific columns only. It can be understood with the help of the following example −ExampleSuppose we are having the values of columns ‘id’, ‘Name’ and ‘Salary’ only in the text file as follows −105, Chum, 11000 106, Danny, 12000Now while importing this text file into MySQL table then we need to mention ...
Read MoreWhat is the difference between MySQL INSTR() and FIND_IN_SET() functions?
As we know, both the functions are used to search a string from the arguments provided in them but there are some significant differences between them as followsFIND_IN_SET() function uses the string list that is itself a string containing the substring separated by commas. Whereas, INSTR() function contains a string from which it will find the position of the first occurrence of the substring if present. In case of integers, FIND_IN_SET() is much more suitable than INSTR() function. It can be understood by the following exampleExamplemysql> Select IF(INSTR('10, 11, 12, 13', 2) > 0, 1, 0) As Result; +--------+ | Result ...
Read MoreHow it is possible in MySQL to find a string of specified pattern within another string?
We can find a string of specified pattern within another string by using LIKE operator along with WILDCARDS.SyntaxLIKE specific_patternSpecific_pattern is the pattern of string we want to find out within another string.ExampleSuppose we have a table named ‘student’ having names of the students and we want to get the details of all those students which are having the pattern of string ‘av’ within their names. It can be done with the help of following MySQL query −mysql> Select * from Student Where Name LIKE '%av%'; +------+--------+---------+-----------+ | Id | Name | Address | Subject | +------+--------+---------+-----------+ ...
Read MoreHow can we import data from .txt file into MySQL table?
It can be done with the help of LOAD DATA INFILE statement. To illustrate the concept we are having the following data, separated by tab, in ‘A.txt’ whose path is d:/A.txt −100 John USA 10000 101 Paul UK 12000 102 Henry NZ 11000 103 Rick USA 17000 104 Corey USA 15000We want to load the data of A.txt into the following table named employee_tbl −mysql> Create table employee_tbl(Id Int, Name varchar(20), Country Varchar(20), Salary Int); Query OK, 0 rows affected (0.91 sec)Now, the transfer of data from a file to a database table can be done with the help ...
Read MoreWhat happens if the value of number ‘N’ in CONV() function is not as per accordance with its base?
MySQL returns 0 as output if the number given in CONV() function is not as per accordance with its base. Suppose, if we want to convert decimal number 9 into the number in binary number system then in this case the value of from_base must be 10 but if we provide 8 as the value of from_base then MySQL returns 0 as output.Examplemysql> Select CONV(9,8,2); +-------------+ | CONV(9,8,2) | +-------------+ | 0 | +-------------+ 1 row in set (0.00 sec)As we know that the values of octal number system must be between 0 to 7, hence the number system for number 9 must be decimal i.e. 10.
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