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This is because if you use && both conditions must be true. If any one condition becomes false then the overall condition evaluates to false.The PHP code is as follows −Example Live Demo OutputThe above condition is true
A static filed/variable belongs to the class and it will be loaded into the memory along with the class. You can invoke them without creating an object. (using the class name as reference). There is only one copy of the static field available throughout the class i.e. the value of the static field will be same in all objects. You can define a static field using the static keyword.Examplepublic class Sample{ static int num = 50; public void demo(){ System.out.println("Value of num in the demo method "+ Sample.num); } public static void main(String ... Read More
To join tables, use the JOIN concept in MySQL. At first, let us create two tables.Let us create the first table −mysql> CREATE TABLE `demo52` ( −> `id` INT NOT NULL, −> `name` VARCHAR(20) NOT NULL, −> PRIMARY KEY (`id`) −> ); Query OK, 0 rows affected (1.19 sec)Insert some records into the table with the help of insert command −mysql> insert into demo52 values(1, 'John'); Query OK, 1 row affected (0.17 sec) mysql> insert into demo52 values(2, 'David'); Query OK, 1 row affected (0.10 sec) mysql> insert into demo52 values(3, 'Mike'); Query OK, 1 row affected (0.13 ... Read More
For this, use ORDER BY CASE WHEN statement.Let us create a table −mysql> create table demo51 −> ( −> id int not null auto_increment primary key, −> name varchar(20) −> ); Query OK, 0 rows affected (1.08 sec)Insert some records into the table with the help of insert command −mysql> insert into demo51(name) values('John'); Query OK, 1 row affected (0.15 sec) mysql> insert into demo51(name) values('Bob'); Query OK, 1 row affected (0.09 sec) mysql> insert into demo51(name) values('David'); Query OK, 1 row affected (0.35 sec) mysql> insert into demo51(name) values('Sam'); Query OK, 1 row affected (0.14 sec)Display ... Read More
At first, you need to extract the last digit and add the extracted value. And the same goes in till we get the sum of all digits of the year, for example, for the year 2020 −2 + 0 + 2 + 0 = 4The concept is as follows to extract the last digit from the year. Following is the query −select floor(@yourVariableName % 10);Following is the query to sum the digits of year −mysql> set @year_column_value = 2020; Query OK, 0 rows affected (0.00 sec) mysql> select −> floor(@year_column_value / 1000) −> + floor(@year_column_value % 1000 / 100) −> ... Read More
For this, you can use TIMESTAMP keyword in MySQL.Let us create a table −mysql> create table demo50 −> ( −> id int not null auto_increment primary key, −> start_date timestamp default current_timestamp not null, −> end_date timestamp default current_timestamp not null −> ); Query OK, 0 rows affected (1.35 sec)Insert some records into the table with the help of insert command −mysql> insert into demo50 values(); Query OK, 1 row affected (0.15 sec) mysql> insert into demo50(end_date) values('2020−12−21'); Query OK, 1 row affected (0.07 sec) mysql> insert into demo50(start_date) values('2020−01−01'); Query OK, 1 row affected (0.14 sec)Display records ... Read More
For this, use concat() along with LIKE. Following is the syntax −select *from yourTableName where concat(', ', yourColumnName, ', ') like '%, yourValue, %';Let us create a table −mysql> create table demo49 −> ( −> id varchar(20) −> , −> first_name varchar(20) −> ); Query OK, 0 rows affected (1.45 sec)Insert some records into the table with the help of insert command −mysql> insert into demo49 values('4, 5, 6', −> 'Adam'); Query OK, 1 row affected (0.20 sec) mysql> insert into demo49 values('5, 3, 2', 'Mike'); Query OK, 1 row affected (0.19 sec) mysql> insert into demo49 values('3, ... Read More
For appending, use the concept of concat(). The syntax is as follows −select *from yourTableName where yourColumnName like concat('%', yourValue, '%');Let us create a table −mysql> create table demo48 -> ( −> id int not null auto_increment primary key, −> name varchar(20) −> ); Query OK, 0 rows affected (0.70 sec)Insert some records into the table with the help of insert command −mysql> insert into demo48(name) values('John Smith'); Query OK, 1 row affected (0.12 sec) mysql> insert into demo48(name) values('John Doe'); Query OK, 1 row affected (0.12 sec) mysql> insert into demo48(name) values('Adam Smith'); Query OK, 1 row ... Read More
Let’s say we tried creating a table with name “groups”, which is a reserved keyword in MySQL You cannot use “groups” because groups is a reserved keyword in MySQL.Following error occurred while creating a table with name “groups” −mysql> create table groups −> ( −> id int, −> name varchar(40) −> ); ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'groups ( id int, name varchar(40) )' at line 1In order to create a table with reserved keyword, you need ... Read More
For this, use CASE WHEN statement in MySQL. Let us create a table −mysql> create table demo47 −> ( −> first_name varchar(20), −> last_name varchar(20) −> ); Query OK, 0 rows affected (1.57 sec)Insert some records into the table with the help of insert command −mysql> insert into demo47 values('John', 'Smith'); Query OK, 1 row affected (0.18 sec) mysql> insert into demo47 values('David', 'Miller'); Query OK, 1 row affected (0.11 sec) mysql> insert into demo47 values('John', 'Doe'); Query OK, 1 row affected (0.12 sec) mysql> insert into demo47 values('Chris', 'Brown'); Query OK, 1 row affected (0.12 sec)Display ... Read More