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Following are the two approaches with the help of which we can enter numeric values as a BINARY number −By prefix ‘B’In this approach we need to quote binary numbers within single quotes with a prefix of B. Then BINARY number string will be automatically converted into a numerical value based on the expression context.Examplemysql> Select B'1110'+0; +-----------+ | B'1110'+0 | +-----------+ | 14 | +-----------+ 1 row in set (0.00 sec)By prefix 0bIn this approach, we need to write BINARY numbers without any quotes with a prefix of 0b. Then BINARY number string will be automatically ... Read More
To initialize a string to an empty list −string myStr = null;Now, use the built-in method IsNullOrEmpty() to check whether the list is empty or not −if (string.IsNullOrEmpty(myStr)) { Console.WriteLine("String is empty or null!"); }Let us see the complete code −Example Live Demousing System; namespace Demo { class Program { static void Main(string[] args) { string myStr = null; if (string.IsNullOrEmpty(myStr)) { Console.WriteLine("String is empty or null!"); } Console.ReadKey(); ... Read More
As we know a one-time event means the events that will be executed only once on a particular schedule. To illustrate the creation of such kind of events we are using the following example in which we are creating an event which will execute at the current time −Examplemysql> Create table event_message(ID INT NOT NULL PRIMARY KEY AUTO_INCREMENT, MESSAGE VARCHAR(255) NOT NULL, Generated_at DATETIMENOT NULL); Query OK, 0 rows affected (0.61 sec) mysql> CREATE EVENT testing_event ON SCHEDULE AT CURRENT_TIMESTAMP DO INSERT INTO event_message(message, generated_at) Values('Hello', NOW()); Query OK, 0 rows affected (0.00 sec) mysql> Select * from ... Read More
To initialize a tuple to an empty tuple −Tuple myTuple;If you want to check for values in a tuple, that whether it is null or not −Exampleusing System; namespace Demo { class Program { static void Main(string[] args) { Tuple tuple = new Tuple(10, null); if (tuple.Item1 == 10) { Console.WriteLine(tuple.Item1); } if (tuple.Item2 == null) { Console.WriteLine("Item is null"); } } } }
Firstly, set the string −string str = "Football and Tennis";Now, use the substring() method to get the last 4 characters −str.Substring(str.Length - 4);Let us see the complete code −Example Live Demousing System; public class Demo { public static void Main() { string str = "Football and Tennis"; string res = str.Substring(str.Length - 4); Console.WriteLine(res); } }Outputnnis
As we know that a NULL is not a value and it is also not the same as zero. MySQL arithmetic expression returns NULL if we will use NULL in it. It can be understood with the help of the following example −Examplemysql> Select 100*NULL; +----------+ | 100*NULL | +----------+ | NULL | +----------+ 1 row in set (0.00 sec) mysql> Select 100+NULL; +----------+ | 100+NULL | +----------+ | NULL | +----------+ 1 row in set (0.00 sec)From the above example, it can be observed that if we will use NULL in an arithmetic expression then the result would be NULL itself.
To insert an item in an already created List, use the Insert() method.Firstly, set elements −List list = new List(); list.Add(989); list.Add(345); list.Add(654); list.Add(876); list.Add(234); list.Add(909);Now, let’s say you need to insert an item at 4th position. For that, use the Insert() method −// inserting element at 4th position list.Insert(3, 567);Let us see the complete example −Exampleusing System; using System.Collections.Generic; namespace Demo { public class Program { public static void Main(string[] args) { List < int > list = new List < int > (); ... Read More
By using the WHERE clause with a DISTINCT clause in MySQL queries, we are putting a condition on the basis of which MySQL returns the unique rows of the result set. By using the LIMIT clause with a DISTINCT clause in MySQL queries, we are actually providing a perimeter to the server about a maximum number of unique rows of the result set to be returned.ExampleWe can use WHERE and LIMIT clause with DISTINCT as follows on the table named ‘testing’ −mysql> Select * from testing; +------+---------+---------+ | id | fname | Lname | +------+---------+---------+ | 200 ... Read More
For getting the records from MySQL table in the result set in a particular way either ascending or descending, we need to use the ORDER BY clause along with ASC or DESC keywords. If we will not use any of the above-mentioned keywords then MySQL by default return the records in ascending order. The ORDER BY clause returned the result set based on a particular field (ascending or descending order) with which we will use the ORDER BY clause. Suppose we want to sort the rows of the following table −mysql> Select * from Student; +--------+--------+--------+ | Name | ... Read More
Set the string −string str = "Cookie and Session";Use the following Regex to get the last 2 characters from string −Regex.Match(str,@"(.{2})\s*$")The following is the code −Example Live Demousing System; using System.Text.RegularExpressions; public class Demo { public static void Main() { string str = "Cookie and Session"; Console.WriteLine(Regex.Match(str,@"(.{2})\s*$")); } }Outputon