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This example demonstrate about How to merge two arrays without duplication in android listview.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 In the code, we have taken listview to show array values.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.widget.ArrayAdapter; import android.widget.EditText; import android.widget.ListView; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.HashSet; public class MainActivity extends AppCompatActivity { ... Read More
Unique in MySQL means we cannot add duplicate records. Let us now see how to create a unique constraint in the column at the time of creating a table.mysql> create table UniqueConstDemo - > ( - > name varchar(100) unique - > ); Query OK, 0 rows affected (0.72 sec)Now, we cannot have same value more than once for column ‘name’.Inserting some records with duplicate values to check the error.mysql> insert into UniqueConstDemo values('John'); Query OK, 1 row affected (0.19 sec) mysql> insert into UniqueConstDemo values('John');On running the above query, the following error is visible.mysql> insert into UniqueConstDemo values('John'); ... Read More
This example demonstrate about How to insert integer array in android listview.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 In the code, we have taken listview to show integer array.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.widget.ArrayAdapter; import android.widget.EditText; import android.widget.ListView; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; public class MainActivity extends AppCompatActivity { ListView list; int[] array ... Read More
We can remove the leading and trailing whitespaces from MySQL with the help of trim() function.The following is the syntax.mysql> SELECT TRIM(' AnyStringWithWhitespaces ');Let us now implement the above syntax in the below query.mysql> SELECT TRIM(' Leading And Trailing whitespaces Demo '); Here is the output that removes the whitespaces.+---------------------------------------+ | TRIM(' Leading And Trailing whitespaces Demo ') | +---------------------------------------+ | Leading And Trailing whitespaces Demo | +---------------------------------------+ 1 row in set (0.00 sec)Let us now see another way to remove the leading and trailing whitespaces.Firstly, let us create a new table.mysql> create table TrimDemo2 -> ( -> name varchar(200) ... Read More
This example demonstrate about How to give on click listener for footer view in android listview.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 In the code, we have taken listview to show array values.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.graphics.Color; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.Gravity; import android.view.View; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.TextView; import java.util.ArrayList; import java.util.Arrays; import java.util.HashSet; public class ... Read More
Let us see some of the ways to check if a table exist in MySQL or not.Using SHOWThe SHOW command displays all the tables.SHOW tables;Here is the output.+--------------------------+ | Tables_in_business | +--------------------------+ | addcheckconstraintdemo | | addcolumntable | | addconstraintdemo | | alphademo | | autoincrement | | autoincrementtable | | backticksymbol | | bookindexes | | chardemo ... Read More
To know a MySQL table is using MyISAM or InnoDB engine, you can use the command show status table. The syntax is as follows −SHOW TABLE STATUS from yourDatabaseName LIKE ‘yourTableName’.The above syntax tells about the specific table engine. Now you can apply the above syntax to know whether the MySQL table engine is using MyISAM or InnoDB.Here, I have database ‘business’ and table ‘student’. The query is as follows −mysql> show table status from business like 'student';The following displays the engine our table ‘student’ is using −+---------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+--------------------+----------+----------------+---------+ | Name | Engine | Version | Row_format | Rows | ... Read More
To insert current date/ time in MySQL, use the now() function. Let us now see an example.At first, we will create a table. The CREATE command is used to create a table.mysql > create table CurrentDateTime -> ( -> CurrentTime datetime -> ); Query OK, 0 rows affected (1.14 sec)Syntax to insert the current date/time with the help of insert command and now()mysql> insert into CurrentDateTime values(now()); Query OK, 1 row affected (0.11 sec)To check that the current date/ time is inserted in the table or not, use the select command.mysql> select *from CurrentDateTime; The following is the output that ... Read More
This example demonstrate about How to find common elements from arrays in android listview.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 In the code, we have taken listview to show array values.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.widget.ArrayAdapter; import android.widget.EditText; import android.widget.ListView; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; public class MainActivity extends AppCompatActivity { ListView ... Read More
The following is the process to simulate MySQL’s ORDER BY FIELD() in PostgreSQL.We have used an Online Compiler to run PostgreSQL.Let us now see what we did above to get the output.Firstly, we created a table.create table PostgreOrderIdDemo ( countryName varchar(20) );Inserted records with the help of INSERT command.insert into PostgreOrderIdDemo values('IND'); insert into PostgreOrderIdDemo values('US'); insert into PostgreOrderIdDemo values('UK');The following is the syntax in PostgreSQL.SELECT * FROM yourTableName ORDER BY CASE WHEN columnName='IND' THEN 1 WHEN columnName='US' THEN 2 WHEN columnName='UK' THEN 3 ELSE 0 END, columnName;ExampleLet us now use the above syntax to get the output.SELECT * ... Read More