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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to add a random number between 30 and 300 to an existing field in MySQL?
Let us first create a demo tablemysql> create table RandomNumberDemo -> ( -> MyNumber int -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into RandomNumberDemo values(17); Query OK, 1 row affected (0.20 sec) mysql> insert into RandomNumberDemo values(18); Query OK, 1 row affected (0.12 sec) mysql> insert into RandomNumberDemo values(29); Query OK, 1 row affected (0.49 sec)Display all records from the table using select statement. The query is as follows −mysql> select *from RandomNumberDemo;The following is the output+----------+ | MyNumber | ...
Read MoreHow to multiply columns and then sum the rows with similar records like customer name?
To understand this, let us create a table with fields like ID, Customer Name, Items, Price. We will first multiply the items with price. After that the rows with similar records i.e. same customer name will get added.Let us first create a table:mysql> create table DemoTable ( CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY, CustomerName varchar(100), CustomerItems int, CustomerPrice int ); Query OK, 0 rows affected (0.54 sec)Following is the query to insert some records in the table using insert command:mysql> insert into DemoTable(CustomerName, CustomerItems, CustomerPrice)values('Larry', 3, 450); Query OK, 1 row affected (0.24 sec) mysql> ...
Read MorePlease share a working example of session maintenance in JSP.
This example describes how to use the HttpSession object to find out the creation time and the last-accessed time for a session. We would associate a new session with the request if one does not already exist. Session Tracking Session Tracking Session info Value ...
Read MoreHow to get particular date records from time stamp in Android sqlite?
Before getting into example, we should know what sqlite data base in android is. SQLite is an open source SQL database that stores data to a text file on a device. Android comes in with built in SQLite database implementation. SQLite supports all the relational database features. In order to access this database, you don't need to establish any kind of connections for it like JDBC, ODBC etc.This example demonstrate about How to get particular date records from time stamp in Android sqlite.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill ...
Read MoreHow to see spaces in data when selecting with MySQL command line client?
Use quote() function for this. The syntax is as follows −select yourColumnName, quote(yourColumnName) from yourTableName;To understand the concept, let us create a table. The query to create a table is as follows −mysql> create table seeSpacesDemo -> ( -> spaceValue varchar(10) -> ); Query OK, 0 rows affected (0.42 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into seeSpacesDemo values(""); Query OK, 1 row affected (0.70 sec) mysql> insert into seeSpacesDemo values(" "); Query OK, 1 row affected (0.45 sec) mysql> insert into seeSpacesDemo values(" "); Query OK, 1 ...
Read MoreHow to delete a row from ResultSet object using JDBC?
The deleteRow() method of the ResultSet interface deletes the current row from the current ResultSet object.//Deleting a column from the ResultSet object rs.deleteRow();Assume we have a table named Cricketers_Data with 6 records as shown below:+----+------------+------------+---------------+----------------+-------------+ | ID | First_Name | Last_Name | Year_Of_Birth | Place_Of_Birth | Country | +----+------------+------------+---------------+----------------+-------------+ | 1 | Shikhar | Dhawan | 1981-12-05 | Delhi | India | | 2 | Jonathan | Trott | 1981-04-22 | CapeTown | SouthAfrica | | 3 ...
Read MoreHow to export specific column data in MySQL?
To export specific column data in MySQL, use OUTFILE −select yourColumnName from yourTableName into outfile 'yourLocationOfFile’;Let us first create a table −mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentFirstName varchar(20), StudentLastName varchar(20) ); Query OK, 0 rows affected (0.54 sec)Insert records in the table using insert command −mysql> insert into DemoTable(StudentFirstName, StudentLastName) values('John', 'Doe'); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable(StudentFirstName, StudentLastName) values('David', 'Miller'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(StudentFirstName, StudentLastName) values('John', 'Smith'); Query OK, 1 row affected (0.15 sec) mysql> insert into ...
Read MoreHow to delete Session data in JSP?
When you are done with a user's session data, you have several options −Remove a particular attribute − You can call the public void removeAttribute(String name) method to delete the value associated with the particular key.Delete the whole session − You can call the public void invalidate() method to discard an entire session.Setting Session timeout − You can call the public void setMaxInactiveInterval(int interval) method to set the timeout for a session individually.Log the user out − The servers that support servlets 2.4, you can call logout to log the client out of the Web server and invalidate all sessions ...
Read MoreHow to get yesterday records from timestamp in Android sqlite?
Before getting into example, we should know what sqlite data base in android is. SQLite is an open source SQL database that stores data to a text file on a device. Android comes in with built in SQLite database implementation. SQLite supports all the relational database features. In order to access this database, you don't need to establish any kind of connections for it like JDBC, ODBC etc.This example demonstrate about How to get yesterday records from timestamp in Android sqlite.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required ...
Read MoreGet count of values that only appear once in a MySQL column?
To get number of values that only appear once in a column, use GROUP BY HAVING. Let us first create a table:mysql> create table DemoTable ( Name varchar(20) ); Query OK, 0 rows affected (0.55 sec)Following is the query to insert some records in the table using insert command:mysql> insert into DemoTable values('Larry'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Larry'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('Sam'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into ...
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