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Articles by Rama Giri
Page 5 of 9
How to find all pairs of elements in Java array whose sum is equal to a given number?
To find all pairs of elements in Java array whose sum is equal to a given number −Add each element in the array to all the remaining elements (except itself).Verify if the sum is equal to the required number.If true, print their indices.Exampleimport java.util.Arrays; import java.util.Scanner; public class sample { public static void main(String args[]){ //Reading the array from the user Scanner sc = new Scanner(System.in); System.out.println("Enter the size of the array that is to be created: "); int size = sc.nextInt(); int[] myArray ...
Read MoreMySQL query to get the highest value from a single row with multiple columns\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n
To get the highest value, use the GREATEST() method. Let us first create a table −mysql> create table DemoTable -> ( -> Value1 int, -> Value2 int, -> Value3 int -> ); Query OK, 0 rows affected (1.29 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 600, 400); Query OK, 1 row affected (0.19 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+--------+--------+--------+ | Value1 | Value2 | Value3 | +--------+--------+--------+ | 100 | 600 | 400 | ...
Read MoreHow to check if a datetime value equals tomorrows date in MySQL?
For this, you can use DATEDIFF(). Let us first create a table −mysql> create table DemoTable -> ( -> ShippingDate datetime -> ); Query OK, 0 rows affected (0.90 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-07-01'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values('2019-07-02'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('2019-07-03'); Query OK, 1 row affected (0.32 sec) mysql> insert into DemoTable values('2019-07-04'); Query OK, 1 row affected (0.15 sec)Display all records ...
Read MoreMySQL query to delete all rows older than 30 days?
To delete all rows older than 30 days, you need to use the DELETE with INTERVAL. Use < now() i.e. less than operator to get all the records before the current date.Let us first create a table −mysql> create table DemoTable -> ( -> UserMessage text, -> UserMessageSentDate date -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Hi', '2019-06-01'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('Hello', '2019-07-02'); Query OK, 1 row affected (0.14 sec) mysql> insert ...
Read MoreCount the number of distinct values in MySQL?
Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(100), -> Code varchar(100) -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', '0001'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Robert', '0002'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('Robert', '0003'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Chris', '0001'); Query OK, 1 row affected (0.12 sec)Display all records from the table using ...
Read MoreFetch records containing a specific character twice in MySQL
Let us first create a table −mysql> create table DemoTable -> ( -> Words text -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Ever'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Forever'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Good'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Never'); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+---------+ | Words ...
Read MoreHow do I search and replace specific chars at the beginning of a string in MySQL?
For this, you can use INSERT(). Let us first create a table −mysql> create table DemoTable -> ( -> ZipCode varchar(200) -> ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('9030'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('3902'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('9083'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('9089'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement ...
Read MoreAUTO_INCREMENT in MySQL can be signed by default?
Yes, the AUTO_INCREMENT in MySQL will be signed (Positive and Negative Value both) by default.Let us first create a table −mysql> create table DemoTable -> ( -> MyNumber int AUTO_INCREMENT PRIMARY KEY -> ); Query OK, 0 rows affected (0.45 sec)Insert some records in the table using insert command. Here, we have set negative values as well for AUTO_INCREMENT column −mysql> insert into DemoTable values() ; Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(-100); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(-300); Query OK, 1 row affected ...
Read MoreCount rows having three or more rows with a certain value in a MySQL table
Let us first create a table −mysql> create table DemoTable -> ( -> UserId int -> ); Query OK, 0 rows affected (0.48 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.09 sec) ...
Read MoreAdding a new column with the current time as a default value in MySQL?
For this, you can use the DEFAULT CURRENT_TIMESTAMP clause in MySQL. Following is the syntax −CREATE TABLE yourTableName ( yourColumnName1 dataType1, yourColumnName timestamp DEFAULT CURRENT_TIMESTAMP );Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> DueDate timestamp default current_timestamp -> ); Query OK, 0 rows affected (0.86 sec)Now you can insert some records in the table using insert command −mysql> insert into DemoTable values(); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+----+---------------------+ ...
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