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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to add last element in android ConcurrentLinkedDeque?
Before getting into example, we should know what ConcurrentLinkedDequeis, it is unbounded deque based on linked nodes. Multiple threads can access deque elements with safety.This example demonstrate about How to add last element 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 text view to showConcurrentLinkedDequeelements.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.os.Build; import android.os.Bundle; import android.support.annotation.RequiresApi; import ...
Read MoreHow to add first element in android ConcurrentLinkedDeque?
Before getting into example, we should know what ConcurrentLinkedDequeis, it is unbounded deque based on linked nodes. Multiple threads can access deque elements with safety.This example demonstrate about How to add first element 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 text view to showConcurrentLinkedDequeelements.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.os.Build; import android.os.Bundle; import android.support.annotation.RequiresApi; import ...
Read MoreMySQL query to search within the last 5 characters in a column?
Let us first create a table −mysql> create table DemoTable -> ( -> EmployeeName varchar(100) -> ); Query OK, 0 rows affected (0.81 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Adam Smith'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Carol Taylor'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('David Miller'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('Chris Evan'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select ...
Read MoreHow to add element based on index in android CopyOnWriteArrayList?
Before getting into example, we should know what CopyOnWriteArrayListis. It is a thread-safe variant of ArrayListand operations add, set, and so on by making a fresh copy of the underlying array.This example demonstrate about How to add element based on index in android CopyOnWriteArrayListStep 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 text view to showCopyOnWriteArrayListelements.Step 3 − Add the following code to src/MainActivity.javapackage ...
Read MoreCreate a temporary table in a MySQL procedure?
To create a temporary table in a MySQL procedure, following is the syntax −CREATE PROCEDURE yourProcedureName() BEGIN CREATE TEMPORARY TABLE yourTemporaryTableName SELECT yourValue; ENDLet us implement the above syntax to create a temporary table and insert some records in the table. Following is the query to create a stored procedure and a temporary table in it −mysql> DELIMITER // mysql> CREATE PROCEDURE create_Temporary_Table() -> BEGIN -> CREATE TEMPORARY TABLE tmpDemoTable SELECT 500; -> END// Query OK, 0 rows affected (0.15 sec)Following is the query to insert record in the table −mysql> ...
Read MoreHow to get everything before the last occurrence of a character in MySQL?
You can use below syntax. Following is the syntax −update yourTableName set yourColumnName=REVERSE(SUBSTRING(REVERSE(yourColumnName), INSTR(REVERSE(yourColumnName), '.')));Let us first create a table −mysql> create table DemoTable -> ( -> Words text -> ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Value1. Value2 .Value3.Value4.Value5'); Query OK, 1 row affected (0.22 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+--------------------------------------+ | Words ...
Read MoreHow to find the minimum values of two or more fields in MySQL?
To find the minimum values of two or more fields, use LEAST() function from MySQL −select least(yourColumnName1, yourColumnName2, ...N) from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> Date1 date, -> Date2 date, -> Date3 date -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-03-31', '2019-01-01', '2019-03-05'); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+------------+------------+------------+ | Date1 | Date2 | Date3 ...
Read MoreMySQL query to split a column after specific characters?
To split a column after specific characters, use the SUBSTRING_INDEX() method −select substring_index(yourColumnName, '-', -1) AS anyAliasName from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> StreetName text -> ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Paris Hill St.-CA-83745646') ; Query OK, 1 row affected (0.32 sec) mysql> insert into DemoTable values('502 South Armstrong Street-9948443'); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+------------------------------------+ | ...
Read MoreCopy a few columns from a table to another in MySQL
Let us first create a table −mysql> create table DemoTable1 -> ( -> Id int, -> Name varchar(100) -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(10, 'John'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable1 values(11, 'Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1 values(12, 'Robert'); Query OK, 1 row affected (0.32 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+------+--------+ | Id ...
Read MoreHow to select the sum of the column values with higher value in reach row with MySQL?
Use the CASE statements and set conditions for the same. Let us first create a table −mysql> create table DemoTable -> ( -> X int, -> Y int -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(20, 30); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(40, 15); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(80, 85); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select ...
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