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Articles on Trending Technologies
Technical articles with clear explanations and examples
MySQL query to get the count of all the elements in the field?
For this, use the COUNT() method. Let us first create a table −mysql> create table DemoTable -> ( -> ProductName varchar(100) -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Product-1'); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values('Product-2'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Product-3'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('Product-3'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values('Product-2'); Query OK, 1 row affected ...
Read MoreGeneration of .HEX file using a linker
The file MULT.ASM which is created by using an editor is simply a text file. We cannot execute this file directly. At first we have to assemble the file, and then we have to link it. The step of assembly the translation of the program of assembly language to machine code requires the generation of a .OBJ file.Now a .HEX file is generated by using a linker. We have seen previously that how the naming of the input and output file is done.Input filenameThe source name of the file must be responded by the user. In the given example the ...
Read MoreSearching for an integer value in a varchar field in MySQL?
To search for an integer value in a varchar filed, you can use CASE statement.Let us first create a table. Consider, we have a list of email-ids −mysql> create table DemoTable -> ( -> Title varchar(100) -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('9John@example.com'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('3Carol@gmail.com'); Query OK, 1 row affected (0.45 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+-------------------+ | Title ...
Read MoreMySQL query to create table dynamically?
For this, you can use stored procedure. Let us create a table dynamically with two columns i.e. StudentId as int, whereas StudentName as varchar −mysql> DELIMITER $$ mysql> CREATE PROCEDURE creatingDynamicTableDemo(yourTableName VARCHAR(200)) -> BEGIN -> SET @name = yourTableName; -> SET @st = CONCAT(' '> CREATE TABLE IF NOT EXISTS `' , @name, '` ( '> `StudentId` int UNSIGNED NOT NULL AUTO_INCREMENT, '> `StudentName` varchar(20) NOT NULL, '> PRIMARY KEY (`StudentId`) '> ) '> '); -> PREPARE ...
Read MoreQuery MySQL with unicode char code?
Let us first create a table −mysql> create table DemoTable -> ( -> Value int -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(0x41); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(0x30); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(0x61); Query OK, 1 row affected (0.27 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+-------+ | Value | +-------+ | 65 | | ...
Read MoreWhat is the importance of a WindowListener interface in Java?
The class which process the WindowEvent needs to be implemented this interface and an object of this class can be registered with a component by using addWindowListener() method.Methods of WindowListener InterfaceThe WindowListener interface defines 7 methods for handling window eventsvoid windowActivated(WindowEvent we) − Invoked when a window is activated.void windowDeactivated(WindowEvent we) − Invoked when a window is deactivated.void windowOpened(WindowEvent we) − Invoked when a window is opened.void windowClosed(WindowEvent we) − Invoked when a window is closed.void windowClosing(WindowEvent we) − Invoked when a window is closing.void windowIconified(WindowEvent we) − Invoked when a window minimized.void windowDeiconfied(WindowEvent we) − Invoked when a window is restored.Syntaxpublic ...
Read MoreGet the number of rows in a particular table with MySQL
Let us first create a table −mysql> create table DemoTable -> ( -> LastName varchar(100) -> ); Query OK, 0 rows affected (0.68 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Smith'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Miller'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Taylor'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Brown'); Query OK, 1 row affected (0.29 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce ...
Read MoreHow to get total occurrences of a value within its own MySQL query?
For this, you can use subquery. Let us first create a table −mysql> create table DemoTable -> ( -> Value int -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.36 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(30); Query OK, ...
Read MoreHow to create and fill a new column in an already created MySQL table?
Let us first create a table −mysql> create table DemoTable -> ( -> Value1 int, -> Value2 int -> ); Query OK, 0 rows affected (0.77 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10, 10); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(20, 30); Query OK, 1 row affected (0.24 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+--------+--------+ | Value1 | Value2 | +--------+--------+ | 10 | 10 | ...
Read MoreHow to remove all instances of a specific character from a column in MySQL?
Let us first create a table −mysql> create table DemoTable -> ( -> FirstName varchar(100) -> ); Query OK, 0 rows affected (0.41 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Adam^^^'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('^^^^^^^^Carol'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Robert^^^^^^'); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+---------------+ | FirstName | +---------------+ | Adam^^^ ...
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