For this, use GROUP BY HAVING clause. Let us first create a table −mysql> create table DemoTable673(    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    Value int ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable673(Value) values(10); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable673(Value) values(20); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable673(Value) values(10); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable673(Value) values(30); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable673(Value) values(20); Query OK, 1 ... Read More

For this, use order by nullif(). Let us first create a table −mysql> create table DemoTable672(    CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    CustomerName varchar(100),    CustomerAmount int ); Query OK, 0 rows affected (0.81 sec)Insert some records in the table using insert command −mysql> insert into DemoTable672(CustomerName, CustomerAmount) values('Chris', 560); Query OK, 1 row affected (0.51 sec) mysql> insert into DemoTable672(CustomerName, CustomerAmount) values('Robert', null); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable672(CustomerName, CustomerAmount) values('', 450); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable672(CustomerName, CustomerAmount) values('David', 456); Query OK, 1 row affected ... Read More

For particular type of columns beginning with a certain letter, use LIKE. To concatenate the column names, use GROUP_CONCAT() as in the below syntax −SELECT group_concat(COLUMN_NAME separator ' , ') FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = "yourTableName" AND table_schema = "yourDatabaseName" AND column_name LIKE "yourSpecificLetter%";Let us first create a table −mysql> create table DemoTable671(    ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    ClientName varchar(100),    ClientAge int,    ClientAddress varchar(200),    ClientCountryName varchar(100) ); Query OK, 0 rows affected (0.62 sec)Following is the query to select particular type of columns beginning with a certain letter and fetch all the column ... Read More

To sort domain names, use the ORDER BY SUBSTRING_INDEX(). Let us first create a table −mysql> create table DemoTable670(DomainName text); Query OK, 0 rows affected (0.77 sec)Insert some records in the table using insert command. Here, we are inserting domain names −mysql> insert into DemoTable670 values('www.facebook.com'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable670 values('www.google.com'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable670 values('www.amazon.com'); Query OK, 1 row affected (0.19 sec)Display all records from the table using select statement −mysql> select *from DemoTable670;This will produce the following output −+------------------+ | DomainName       ... Read More

For this, use ORDER BY ISNULL(). Let us first create a table −mysql> create table DemoTable669 (    StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    StudentScore int ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command −mysql> insert into DemoTable669(StudentScore) values(45) ; Query OK, 1 row affected (0.80 sec) mysql> insert into DemoTable669(StudentScore) values(null); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable669(StudentScore) values(89); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable669(StudentScore) values(null); Query OK, 1 row affected (0.15 sec)Display all records from the table using select ... Read More

Let us first create a table −mysql> create table DemoTable668(JoiningDate varchar(200)); Query OK, 0 rows affected (0.97 sec)Insert some records in the table using insert command. We have inserted date in the format yyyy-mm-ddThh:mm:ss.sssZ −mysql> insert into DemoTable668 values('2001-01-10T06:20:00.000Z'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable668 values('2019-07-20T04:00:00.000Z'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable668 values('2016-02-12T05:10:50.000Z'); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable668;This will produce the following output −+--------------------------+ | JoiningDate             | +--------------------------+ | ... Read More

Let’s say the current date is 2019-07-25. We will now see an example and create a table where ShippingDate is added in the table.Let us first create a table −mysql> create table DemoTable667(ShippingDate datetime); Query OK, 0 rows affected (0.46 sec)Insert some records in the table using insert command −mysql> insert into DemoTable667 values('2019-01-31'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable667 values('2019-07-19'); Query OK, 1 row affected (0.69 sec) mysql> insert into DemoTable667 values('2019-07-23'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable667 values('2019-08-24'); Query OK, 1 row affected (0.15 sec)Display all records from ... Read More

To grant replication privilege, use GRANT REPLICATION SLAVE ON.First list all the user names along with host from MySQL.user table −mysql> select user, host from mysql.user;This will produce the following output −+------------------+-----------+ | user             | host | +------------------+-----------+ | Bob              | % | | Charlie          | % | | Robert           | % ... Read More

Let us first create a table −mysql> create table DemoTable666(AdmissionDate varchar(200)); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable666 values('Sat, 20 Jul 2019 04:29:35'); Query OK, 1 row affected (1.12 sec) mysql> insert into DemoTable666 values('Fri, 02 Oct 2018 12:19:15'); Query OK, 1 row affected (1.05 sec) mysql> insert into DemoTable666 values('Sun, 01 Aug 2016 11:10:05'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable666 values('Fri, 06 Nov 2015 04:06:05 -0500'); Query OK, 1 row affected (0.24 sec)Display all records from the table using select statement −mysql> ... Read More

The TIMESTAMPDIFF() calculates the difference between two dates or datetime expressions. Let us first create a table −mysql> create table DemoTable665(    PunchInTime datetime,    PunchOutTime datetime,    Details INT(11) AS (ABS(TIMESTAMPDIFF(second, PunchInTime, PunchOutTime))) )ENGINE=MyISAM; Query OK, 0 rows affected (0.23 sec)Insert some records in the table using insert command −mysql> insert into DemoTable665(PunchInTime, PunchOutTime) values('2019-09-21 9:30:10', '2019-09-21 04:34:56'); Query OK, 1 row affected (0.05 sec) mysql> insert into DemoTable665(PunchInTime, PunchOutTime) values('2019-11-11 10:00:20', '2019-11-11 05:30:16'); Query OK, 1 row affected (0.04 sec)Display all records from the table using select statement −mysql> select *from DemoTable665;This will produce the following output −+---------------------+---------------------+---------+ ... Read More