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Strings, which are widely used in Java programming, are a sequence of characters. In Java programming language, strings are treated as objects.The Java platform provides the String class to create and manipulate strings.The most direct way to create a string is to write −String greeting = "Hello world!";Whenever it encounters a string literal in your code, the compiler creates a String object with its value in this case, "Hello world!'.ExampleLive Demopublic class StringDemo { public static void main(String args[]) { char[] helloArray = { 'h', 'e', 'l', 'l', 'o', '.' }; String helloString ... Read More
Let us first create a table −mysql> create table DemoTable -> ( -> UserName varchar(20), -> UserType ENUM('New User', 'Registered User') -> ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 'New User'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('David', 'New User'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('Mike', 'Registered User'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('Sam', 'New User'); Query OK, 1 row affected (0.10 sec)Display all records ... Read More
You can concatenate multiple strings using the ‘+’ operator of Java.Examplepublic class Test { public static void main(String args[]) { String st1 = "Hello"; String st2 = "How"; String st3 = "You"; String res = st1+st2+st3; System.out.println(res); } }OutputHelloHowYou
To round number, use MySQL ROUND(). Let us first create a table −mysql> create table DemoTable -> ( -> Amount DECIMAL(10, 4) -> ); Query OK, 0 rows affected (1.18 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100.578); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(1000.458); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(980.89); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select * from DemoTable;This will produce the following output−+-----------+ | Amount | ... Read More
You can use ORDER BY STR_TO_DATE(). Let us first create a table −mysql> create table DemoTable -> ( -> DueTime varchar(20) -> ); Query OK, 0 rows affected (0.87 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('7:30AM'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('9:00PM'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values('11:00PM'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select * from DemoTable;This will produce the following output−+---------+ | DueTime | +---------+ | ... Read More
The group is a reserved keyword, you can’t use it as table name. Therefore, on using it as table name would lead to an error. To avoid such error, you need to use enclosed backticks symbol around the table name ‘group’.Let us now see an example and create a table −mysql> create table `group` -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20) -> ); Query OK, 0 rows affected (1.26 sec)Insert some records in the table using insert command −mysql> insert into `group`(Name) values('Chris'); Query OK, 1 row affected (0.47 sec) ... Read More
To set conditions while adding column values, use MySQL IF(). Let us first create a table −mysql> create table DemoTable -> ( -> Value1 int, -> Value2 int, -> Value3 int -> ); Query OK, 0 rows affected (0.64 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10, 20, -30); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(50, 60, 90); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(100, 200, 400); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values(30, ... Read More
To set conditions, use CASE WHEN statement in MySQL. Let us first create a table −mysql> create table DemoTable -> ( -> Value1 int, -> Value2 int, -> Value3 int, -> Value4 int -> ); Query OK, 0 rows affected (0.98 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1, 0, 1, 1); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(1, 0, 1, 0); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(1, 1, 1, 1); Query OK, 1 row affected (0.20 ... Read More
To change the MySQL ending statement, you can use DELIMITER −DELIMITER anySymbolAbove, anySymbol is the symbol you can set. The default is DELIMITER ;Let us first create a table −mysql> DELIMITER // mysql> create table DemoTable -> ( -> Id int, -> Name varchar(20) -> )// Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 'Chris')// Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(101, 'David')// Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(102, 'Bob')// Query OK, 1 ... Read More
Let us first create a table −mysql> create table DemoTable -> ( -> Value int -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values(60); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values(45); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(85); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(78); Query OK, 1 row affected (0.10 sec)Display all records from the table ... Read More