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Let us first create a table wherein we have a Primary Key CustomerId −mysql> create table DemoTable ( CustomerId int NOT NULL AUTO_INCREMENT, CustomerName varchar(20), CustomerAge int, CustomerCountryName varchar(100), PRIMARY KEY(CustomerId) ); Query OK, 0 rows affected (0.94 sec)Following is the query to get the primary key “column name” of a specific table in MySQL −mysql> SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE TABLE_NAME = 'DemoTable' AND CONSTRAINT_NAME = 'PRIMARY';This will produce the following output −+-------------+ | COLUMN_NAME | +-------------+ | CustomerId | +-------------+ 1 row in set, 2 warnings (0.12 sec)
When we execute certain SQL queries (SELECT query in general) they return tabular data.The java.sql.ResultSet interface represents such tabular data returned by the SQL statements.i.e. the ResultSet object holds the tabular data returned by the methods that execute the statements which quires the database (executeQuery() method of the Statement interface in general).The ResultSet object has a cursor/pointer which points to the current row. Initially this cursor is positioned before first row.The getRow() method of the ResultSet interface retrieves the current row number/position of the ResultSet pointer.This method returns an integer value representing the current row number to which the ResultSet pointer points to.ExampleLet us ... Read More
To use new line separator in group_concat() function, follow the below syntax −select group_concat(concat_ws(' ', yourColumnName1, yourColumnName2) SEPARATOR "\r") from yourTableName;Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(20), LastName varchar(20) ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName, LastName) values('John', 'Smith'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(FirstName, LastName) values('David', 'Miller'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(FirstName, LastName) values('John', 'Doe'); ... Read More
Let us see some examples to work with different border layout position options such as PAGE_START, PAGE_END, etc.The following is an example of BorderLayout.PAGE_START option −Examplepackage my; import java.awt.BorderLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextArea; import javax.swing.JToolBar; public class SwingDemo { public static void main(String[] args) { JPanel panel = new JPanel(new BorderLayout()); JToolBar toolbar = new JToolBar(); panel.add(toolbar, BorderLayout.PAGE_START); toolbar.add(new JTextArea(" Add name here")); toolbar.add(new JButton("Submit Name")); toolbar.addSeparator(); toolbar.add(new JTextArea(" Add age here")); ... Read More
Here we will see how we can subtract two consecutive elements in an array using 8085.Problem StatementWrite 8085 program to subtract two consecutive elements of an array and store them in the same location. The results will be placed at the same location from where they are taken. The numbers are stored from location 8001. The size of array is stored at 8000.DiscussionHere we will solve this problem by using one subroutine. That will subtract two consecutive numbers and stored them into correct position. That subroutine will be called multiple times to subtract all consecutive pairs. The task will be ... Read More
For this, use IF(). Let us first create a table −mysql> create table DemoTable -> ( -> PlayerName varchar(100), -> PlayerScore int, -> PlayerStatus varchar(100) -> ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John', 88, 'BAD'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Chris', 78, 'BAD'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('Robert', 90, 'BAD'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('David', 80, 'BAD'); Query ... Read More
The HTML DOM input button type property returns the type of the input button i.e. whether it is of “button”, “submit” or “reset” type.SyntaxFollowing is the syntax −object.typeExampleLet us see an example of input button type property − Live Demo HTML DOM type Property body{ text-align:center; } .btn{ display:block; margin:1rem auto; background-color:#db133a; color:#fff; border:1px solid #db133a; padding:0.5rem; border-radius:50px; width:40%; } .show-type{ font-weight:bold; ... Read More
The HTML DOM Input DatetimeLocal min property returns/sets min attribute of Input DatetimeLocal.SyntaxFollowing is the syntax −Returning string valueinputDatetimeLocalObject.minSetting min to string valueinputDatetimeLocalObject.min = YYYY-MM-DDThh:mm:ssString ValuesHere, “YYYY-MM-DDThh:mm:ss” can be the following −stringValueDetailsYYYYIt defines year (eg:199)MMIt defines month (eg: 07 for July)DDIt defines Day (eg: 11)TIt is a separator for date and timehhIt defines hour (eg:08)mmIt defines minutes (eg:18)ssIt defines seconds (eg:23)ExampleLet us see an example of Input DatetimeLocal min property − Live Demo Input DatetimeLocal min form { width:70%; margin: 0 auto; text-align: center; } * ... Read More
The KeyboardEvent charCode property returns the unicode character codes corresponding to character that was pressed using an event.Note − Use key property instead for accurate resultsSyntaxFollowing is the syntax −Returning latest typed character’s charCode −event.charCodeExampleLet us see an example for KeyboardEvent charCode property − Live Demo KeyboardEvent charCode form { width:70%; margin: 0 auto; text-align: center; } * { padding: 2px; margin:5px; } input[type="button"] { border-radius: 10px; } KeyboardEvent-charCode Fill ... Read More
Both pow() and power() are synonyms in MySQL. Following is the syntax −select pow(yourValue1, yourValue2); OR select power(yourValue1, yourValue2);Let us implement both the above syntaxes.Using POW()mysql> select POW(4, 3);This will produce the following output −+----------+ | POW(4, 3) | +----------+ | 64 | +----------+ 1 row in set (0.00 sec)Using POWER()mysql> select POWER(4, 3);This will produce the following output −+------------+ | POWER(4, 3) | +------------+ | 64 | +------------+ 1 row in set (0.00 sec)Let us implement the above syntax in a table −mysql> create table ... Read More