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Articles on Trending Technologies
Technical articles with clear explanations and examples
Selecting random entry from MySQL Database?
Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientName varchar(100), ClientAge int ); Query OK, 0 rows affected (0.92 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(ClientName, ClientAge) values('Robert', 45); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(ClientName, ClientAge) values('Mike', 55); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(ClientName, ClientAge) values('Bob', 42); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable(ClientName, ClientAge) values('Sam', 47); Query OK, 1 row affected (0.11 sec)Display all records from ...
Read MoreHow to get the 2nd highest value from a table with Student Score?
To fetch the 2nd highest value, use ORDER BY DESC with LIMIT 1, 1. Let us first create a table −mysql> create table DemoTable ( StudentScore int ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(89); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(69); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(97); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(99); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement ...
Read MoreHow to retrieve the corresponding value for NULL with a MySQL query?
For this, use IS NULL property. Let us first create a table −mysql> create table DemoTable ( EmployeeName varchar(100), EmployeeAge int ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 32); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('David', 45); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('Bob', NULL); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('Sam', 28); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> ...
Read MoreSet a custom value for AUTO_INCREMENT while creating a table and use ZEROFILL. What will happen now when nothing is inserted while using INSERT statement?
We will see an example and create a table wherein we have set StudentId column as AUTO_INCREMENT = 100 and used ZEROFILL as well −mysql> create table DemoTable ( StudentId int(7) ZEROFILL NOT NULL AUTO_INCREMENT, PRIMARY KEY(StudentId) )AUTO_INCREMENT=100; Query OK, 0 rows affected (0.48 sec)Insert some records in the table using insert command. Now, when nothing is inserted, the value would begin from 101 (auto_increment) and rest of the values in the left would be filled with 0 since we have set ZEROFILL while creating the table above −mysql> insert into DemoTable values(); Query OK, 1 row affected ...
Read MoreHow to delete fields with values more than a particular value in MySQL?
Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, PlayerName varchar(100), PlayerScore int ); Query OK, 0 rows affected (0.97 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(PlayerName, PlayerScore) values('Chris', 780); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable(PlayerName, PlayerScore) values('Sam', 1100); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable(PlayerName, PlayerScore) values('Mike', 900); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(PlayerName, PlayerScore) values('Bob', 890); Query OK, 1 row affected (0.15 sec) mysql> insert into ...
Read MoreFormat MySQL CURRENT_TIMESTAMP to AM & PM?
To format, use DATE_FORMAT(). Let us first create a tablemysql> create table DemoTable ( LoginTime time ); Query OK, 0 rows affected (0.48 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('13:10'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('20:08'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values('10:55'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('16:40'); Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+-----------+ | ...
Read MoreHow to remove only the first word from columns values with a MySQL query?
To remove only the first word from column values, use substring(). Following is the syntax −select substring(yourColumnName, locate(' ', yourColumnName)+1) AS anyAliasName from yourTableName;Let us first create a table −mysql> create table DemoTable ( Title text ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Java in Depth'); Query OK, 1 row affected (0.49 sec) mysql> insert into DemoTable values('C++ is an object oriented programming language'); Query OK, 1 row affected (0.47 sec) mysql> insert into DemoTable values('MySQL is a relational database'); Query OK, 1 row affected (0.17 ...
Read MoreRemove 20% from stored price in MySQL field, using SQL query?
Let’s say the stored price is inclusive of 20% sales tax. Now, let us first create a table −mysql> create table DemoTable ( Price int ); Query OK, 0 rows affected (1.09 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable values(80); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(60); Query OK, 1 row affected (0.18 sec)Display all records from the table using select statement −mysql> select ...
Read MoreConvert Iterator to Iterable in Java
Let’s say the following is our Iterator with Integer values −Iteratoriterator = Arrays.asList(20, 40, 60, 80, 100, 120, 150, 200).iterator();Now, convert the Iterator to Iterable −Iterableiterable = StreamSupport.stream(Spliterators.spliteratorUnknownSize(iterator, 0),false).collect(Collectors.toList());ExampleFollowing is the program to convert Iterator to Iterable in Java −import java.util.*; import java.util.stream.Collectors; import java.util.stream.StreamSupport; public class Demo { public static void main(String[] args) { Iteratoriterator = Arrays.asList(20, 40, 60, 80, 100, 120, 150, 200).iterator(); Iterableiterable = StreamSupport.stream(Spliterators.spliteratorUnknownSize(iterator, 0), false).collect(Collectors.toList()); System.out.println("Iterable = "); iterable.forEach(System.out::println); } }OutputIterable = 20 40 60 80 100 120 150 200
Read MoreConvert an Iterator to Stream in Java
At first, set an Interator −Iteratoriterator = Arrays.asList(50, 100, 200, 400, 500, 1000).iterator();Now, we have used stream −Streamstream = convertIterator(iterator);Above, the method convertIterator() is used for conversion. Following is the method −public static Stream convertIterator(Iterator iterator) { return StreamSupport.stream(((Iterable) () -> iterator).spliterator(), false); }ExampleFollowing is the program to convert an Iterator to Stream in Java −import java.util.stream.*; import java.util.*; public class Demo { public static Stream convertIterator(Iterator iterator) { return StreamSupport.stream(((Iterable) () -> iterator).spliterator(), false); } public static void main(String[] args) { Iteratoriterator = Arrays.asList(50, 100, 200, ...
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