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Articles by karthikeya Boyini
Page 94 of 143
How to sort an alphanumeric column in MySQL?
To sort an alphanumeric column, use LIKE operator along with SUBSTRING(). Let us first create a table −mysql> create table DemoTable -> ( -> StudentId varchar(100) -> ); Query OK, 0 rows affected (1.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('S/TU/100'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable values('S/TU/1000'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values('S/TU/10'); Query OK, 1 row affected (0.47 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following ...
Read MoreHow to use a single MySQL query to count column values ignoring null?
For this, you can COUNT() method, which does not include NULL value. Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(100), -> CountryName varchar(100) -> ); Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John', null); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Chris', 'US'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Robert', null); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Bob', 'UK'); Query ...
Read MoreImplement MySQL LIMIT and OFFSET in a single query stating its difference
The LIMIT tells about how many records you want while OFFSET gives the records from the given position+1. Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(100) -> ); Query OK, 0 rows affected (1.33 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values('Bob'); Query OK, 1 ...
Read MoreHow to use special characters in column names with MySQL?
Using backticks around the column name will allow you to use special characters. Let us first create a table −mysql> create table DemoTable -> ( -> `Student-Id` int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> `Student-Name` varchar(100), -> `Student-Age` int -> ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(`Student-Name`, `Student-Age`) values('Chris', 21); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(`Student-Name`, `Student-Age`) values('Mike', 19); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(`Student-Name`, `Student-Age`) values('Bob', 18); Query OK, ...
Read MoreCan we use semicolon as a MySQL DEMILITER?
No, we cannot. If you still did it, then stored procedure won’t get created. Therefore, first you need to change your DELIMITER from semicolon(;) to others like (// ,??..etc). Following is the syntax −DELIMITER // CREATE PROCEDURE yourProcedureName() BEGIN yourStatement1, . . . . N END // DELIMITER ;Let us implement the above syntax in order to create a stored procedure −mysql> DELIMITER // mysql> CREATE PROCEDURE get_Message() -> BEGIN -> SELECT CONCAT("HELLO", " ", "MYSQL USERS"); -> END -> // Query OK, 0 rows affected (0.23 sec) mysql> DELIMITER ;Now you can call the stored ...
Read MoreCan we use PRIMARY KEY( column1, column2) in MySQL to make pairs?
Yes, you can use below syntax. Following is the syntax −PRIMARY KEY(yourColumnName1, yourColumnName2);Let us first create a table −mysql> create table DemoTable -> ( -> StudentFirstName varchar(100), -> StudentLastName varchar(100), -> StudentAge int, -> StudentCountryName varchar(100), -> PRIMARY KEY(StudentFirstName, StudentLastName) -> ); Query OK, 0 rows affected (0.74 sec)Let us check the description of the table −mysql> desc DemoTable;OutputThis will produce the following output −+--------------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +--------------------+--------------+------+-----+---------+-------+ | StudentFirstName | ...
Read MoreImplement multiple COUNT() in a single MySQL query
For this, use CASE statement. Let us first create a table −mysql> create table DemoTable -> ( -> LastName varchar(100) -> ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Smith'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Brown'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Brown'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Smith'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Taylor'); Query OK, 1 ...
Read MoreHow to add multiple intervals to DATE_ADD() in MySQL?
The current date and time is as follows −mysql> select now();OutputThis will produce the following output −+---------------------+ | now() | +---------------------+ | 2019-06-15 12:24:06 | +---------------------+ 1 row in set (0.00 sec)Let us first create a table −mysql> create table DemoTable ->( -> ArrivalDate datetime -> ); Query OK, 0 rows affected (1.15 sec)Insert some records in the table using insert command. Here, we are adding multiple intervals to the DATE_ADD() method −mysql> insert into DemoTable values(DATE_ADD(DATE_ADD(NOW(), INTERVAL 6 MONTH), INTERVAL 1 YEAR)); Query OK, 1 row affected (0.13 sec) ...
Read MorePerforming Google Search using Python code?
In this article, we will try to do google search using python code, this comes handy in case you are working on a python project and you need to access some data from the web and the search result(from the web) is going to be used inside your project.Prerequisite –You must have python installed on your system.Install google module. You can use pip to install google module like below −C:\Users\rajesh>python -m pip install google Collecting google Downloading https://files.pythonhosted.org/packages/c8/b1/887e715b39ea7d413a06565713c5ea0e3132156bd6fc2d8b165cee3e559c/google-2.0.1.tar.gz Requirement already satisfied: beautifulsoup4 in c:\python\python361\lib\site-packages (from google) (4.6.0) Installing collected packages: google Running setup.py install for google ... done Successfully installed ...
Read MorePlotting Google Map using gmplot package in Python?
There are numerous ways you can draw geographical coordinates on Google Maps. However, in case you want to save it in a local file, one better way to accomplish is through a python module called gmplot.Python library gmplot allows us to plot data on google maps. gmplot has a matplotlib-like interface to generate the HTML and javascript to deliver all the additional data on top of Google Maps.InstallationIt is easy to install gmplot using pip incase gmplot is not already installed −pip install gmplotOn running above command, you may see output something like −From above, we can see the latest ...
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