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Articles on Trending Technologies
Technical articles with clear explanations and examples
How can I implement an interval condition for due dates correctly in MySQL?
Let us first create a table −mysql> create table DemoTable (DueDate date); Query OK, 0 rows affected (0.92 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable values('2019-01-12'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('2019-04-01'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('2019-07-19'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+------------+ | DueDate | +------------+ | 2019-01-12 | | 2019-04-01 | | 2019-07-19 | +------------+ 3 rows in set (0.00 sec)Following is the query to ...
Read MoreGet a fixed number of results in descending order using a MySQL query
For descending order result, use DESC. However, LIMIT is used to get fixed number of records −select *from yourTableName order by yourColumnName DESC LIMIT yourLimitNumber;Let us first create a table −mysql> create table DemoTable (Id int, Name varchar(100)); Query OK, 0 rows affected (0.73 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable values(100, 'John'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(101, 'Chris'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(102, 'Robert'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(103, 'Bob'); Query OK, ...
Read MoreRound seconds to nearest half minute in MySQL?
To round seconds to nearest half minute, use CEILING(). Let us first create a table −mysql> create table DemoTable (secondValue int); Query OK, 0 rows affected (0.64 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable values(27); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values(56); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(118); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+-------------+ | secondValue | +-------------+ | 27 | | 56 ...
Read MoreSelect three random records with a fixed number of characters for each column value in MySQL
For this, you can use CHAR_LENGTH(). Use RAND() for random records. Let us first create a table −mysql> create table DemoTable (Subject text); Query OK, 0 rows affected (0.61 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable values('C'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('MySQL'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Java'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('MongoDB'); Query OK, 1 row affected (0.59 sec) mysql> insert into DemoTable values('RubyOnRails'); Query OK, 1 row affected (0.25 sec) mysql> insert ...
Read MoreMySQL query to select top n rows efficiently?
Use index to select top n rows efficiently. Let us first create a table −mysql> create table DemoTable (StudentName varchar(100), StudentScore int ); Query OK, 0 rows affected (0.66 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable values('John', 34); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Carol', 55); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Bob', 58); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Sam', 38); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Mike', 48); Query OK, 1 row ...
Read MoreHow does selenium interact with the Web browser?
Selenium is an open source framework used for automation of web applications. Apart from this, it can also work on various administrative tasks such as monitoring of websites.There are 4 flavors of Selenium −Selenium-IDE.Selenium-RC.Selenium Grid.Selenium Web Driver.Let’s have a look at the uses of each of them −Selenium IDE − It is the Integrated Development Environment which has easy to use interface used for building and running Selenium Test Cases. It is a prototyping tool for building test scripts in a way that it records the user actions as they are performed. The recorded actions are stored as a script ...
Read MoreHow to register a BroadcastReceiver programmatically in Android?
This example demonstrates how do I register a BroadcastReceiver programtically in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javaimport android.content.IntentFilter; import android.net.ConnectivityManager; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; public class MainActivity extends AppCompatActivity { ExampleBroadcastReceiver exampleBroadcastReceiver = new ExampleBroadcastReceiver(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } protected void onStart(){ ...
Read MoreHow to use size() in android ConcurrentLinkedDeque?
Before getting into the example, we should know what ConcurrentLinkedDeque is, it is unbounded deque based on linked nodes. Multiple threads can access deque elements with safety.This example demonstrates about How to use size() in android ConcurrentLinkedDequeStep 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code, we have taken a text view to show ConcurrentLinkedDeque elements.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.os.Build; import android.os.Bundle; ...
Read MoreHow to get screen DPI programmatically in Android?
This example demonstrates how do I get screen DPI programatically in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javaimport android.app.Activity; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.DisplayMetrics; import android.view.View; import android.widget.Button; import android.widget.TextView; public class MainActivity extends AppCompatActivity { Button button; TextView textview; float value = 0; DisplayMetrics displaymetrics; Activity activity; @Override protected void ...
Read MoreHow to format date and time in android?
This example demonstrates how do I format date and time in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javaimport android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.TextView; import java.text.SimpleDateFormat; import java.util.Calendar; public class MainActivity extends AppCompatActivity { TextView textView; String dateTime; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView = findViewById(R.id.textView); ...
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