Yes, we can change the order of columns. This can be done using ALTER command and AFTER to set the new order of an individual column. Let us first create a table −mysql> create table DemoTable    -> (    -> `Student_Key_Age` int,    -> `Student_Key_Name` varchar(20),    -> `Student_Key_CountryName` varchar(20)    -> ); Query OK, 0 rows affected (0.64 sec)Following is the query to alter order of columns −mysql> alter table DemoTable modify column `Student_Key_Age` int after `Student_Key_Name`; Query OK, 0 rows affected (1.15 sec) Records: 0 Duplicates: 0 Warnings: 0Let us check the table description once again −mysql> ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> StudentName varchar(20),    -> StudentMarks int,    -> Status varchar(20)    -> ); Query OK, 0 rows affected (0.97 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(StudentName, StudentMarks) values('Chris', 79); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(StudentName, StudentMarks) values('David', 59); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(StudentName, StudentMarks) values('Bob', 60); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable(StudentName, StudentMarks) values('Mike', ... Read More

To perform custom sorting in MySQL, use ORDER BY FIELD(). Let us first create a table −mysql> create table DemoTable    -> (    -> Id int    -> ); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert command:mysql> insert into DemoTable values(101); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(103); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(102); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values(105); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> Id int,    -> Name varchar(20)    -> ); Query OK, 0 rows affected (0.93 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(101, 'Chris'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values(102, 'David'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(103, 'Robert'); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output−+------+--------+ |   Id | Name ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> EmailAddress varchar(20),    -> Score int    -> ); Query OK, 0 rows affected (1.05 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris@gmail.com', 67); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('Robert@gmail.com', 57); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('David@gmail.com', 98); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+------------------+-------+ | EmailAddress     ... Read More

To remove trailing space, use RTRIM() in MySQL. Let us first create a table −mysql> create table DemoTable    -> (    -> FirstName varchar(50)    -> ); Query OK, 0 rows affected (1.38 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John '); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Chris '); Query OK, 1 row affected (0.51 sec) mysql> insert into DemoTable values(' David '); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Mike'); Query OK, 1 row affected (0.17 sec)Display all records from the table ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> Id int,    -> Name varchar(20)    -> ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command:Insert some records in the table using insert command: mysql> insert into DemoTable values(100, 'Bob'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(101, 'Chris'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(102, 'David'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(103, 'Sam'); Query OK, 1 row affected (0.08 sec) mysql> ... Read More

To update MySQL table engine, following the below syntax −Syntaxalter table yourTableName ENGINE=InnoDB;Let us first create a table −mysql> create table DemoTable    -> (    -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> StudentName varchar(20),    -> StudentAge int,    -> StudentCountryName varchar(20)    -> )ENGINE=MyISAM, AUTO_INCREMENT=101; Query OK, 0 rows affected (0.18 sec)Let us check the description of table −mysql> show create table DemoTable;This will produce the following output −+---------------+-----------------------------------------------------------------------------------------+ | Table         | Create Table                                   ... Read More

For this, use ORDER BY clause. Let us first create a table −mysql> create table DemoTable    -> (    -> StudentCode varchar(20)    -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('101J'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('100A'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('100B'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('101S'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('103M'); Query OK, 1 row affected (0.15 ... Read More

For this, use MAX() along with GROUP BY clause. Let us first create a table −mysql> create table DemoTable    -> (    -> StudentEmailId varchar(20),    -> Marks1 int,    -> Marks2 int -> ); Query OK, 0 rows affected (0.90 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John@gmail.com', 45, 32); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable values('John@gmail.com', 32, 45); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable values('Carol@gmail.com', 32, 45); Query OK, 1 row affected (1.64 sec) mysql> insert into DemoTable values('David@gmail.com', 45, 32); ... Read More