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We can use the HAVING clause rather than the WHERE in MySQL. Let us first create a table −mysql> create table DemoTable ( Name varchar(50), Price int ); Query OK, 0 rows affected (0.79 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 30); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('David', 40); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Chris', 10); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Mike', 44); Query OK, 1 row affected (0.14 sec) mysql> insert into ... Read More
To display a single random row, use the RAND() with LIMIT. Here, LIMIT is used to fetch the number of records, since we want only a single row, therefore use LIMIT 1. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(50), Quote text ); Query OK, 0 rows affected (0.71 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name, Quote) values('Chris', 'MySQL is a relational database'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Name, Quote) values('Robert', 'Java is an ... Read More
JavaScript's interaction with HTML is handled through events that occur when the user or the browser manipulates a page.When the page loads, it is called an event. When the user clicks a button, that click to is an event. Other examples include events like pressing any key, closing a window, resizing a window, etc.Here are some examples:onclick Event TypeThis is the most frequently used event type, which occurs when a user clicks the left button of his mouse. You can put your validation, warning etc., against this event type.Try the following example.Live Demo ... Read More
You can use the os.chroot to change the root directory of the current process to path. This command is only available on Unix systems. You can use it as follows:>>> import os >>> os.chroot('/tmp/my_folder')This changes the root directory of the script running to /tmp/my_folder.
Let us first create a table −mysql> create table DemoTable ( AdmissionDate date ); Query OK, 0 rows affected (0.73 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-08-31'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('2019-09-01'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('2019-05-10'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('2019-06-12'); Query OK, 1 row affected (0.25 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+---------------+ | AdmissionDate | +---------------+ ... Read More
To set a custom value for NULL values, use the UPDATE command along with IS NULL property in a stored procedure. Let us first create a table −mysql> create table DemoTable ( Id int, FirstName varchar(50) ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 'Chris'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(101, NULL); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(102, 'Mike'); Query OK, 1 row affected (0.38 sec) mysql> insert into DemoTable values(103, NULL); Query ... Read More
The autoincrement in MySQL gives a unique number every time. By default, it starts at 1. If you want to start from another number, then you need to change the auto-increment value with the help of ALTER command or you can give value at the time of table creation.Let us first create a table −mysql> create table DemoTable ( UniqueNumber int NOT NULL AUTO_INCREMENT, PRIMARY KEY(UniqueNumber) ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable ... Read More
Let us first create a table −mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(50), StudentAge int ); Query OK, 0 rows affected (0.72 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(StudentName, StudentAge) values('Chris', 21); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(StudentName, StudentAge) values('David', 23); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(StudentName, StudentAge) values('Bob', 22); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(StudentName, StudentAge) values('Carol', 21); Query OK, 1 row affected (0.30 sec)Display all records from ... Read More
For this, you can use COUNT() along with DISTINCT. The COUNT() method is to count the records. However, the DISTINCT returns distinct records, whereas COUNT() method counts those unique records. Let us first create a table −mysql> create table DemoTable ( PhoneNumber bigint ); Query OK, 0 rows affected (1.29 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(8567789898); Query OK, 1 row affected (0.94 sec) mysql> insert into DemoTable values(8567789898); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable values(9876564534); Query OK, 1 row affected (0.43 sec) mysql> insert into DemoTable ... Read More
To order, use the ORDER BY DESC clause. With that, since we want a single ID, which should be the highest, use LIMIT 1. This will fetch the row with highest ID. Let us first create a table −mysql> create table DemoTable ( Id int, FirstName varchar(50) ); Query OK, 0 rows affected (0.83 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 'Chris'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(110, 'Robert'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(120, 'Mike'); Query OK, 1 ... Read More