Let us first create a table −mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> Name varchar(100)    -> ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name) values('John'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(Name) values('David'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(Name) values('Carol'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(Name) values('Bob'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Name) ... Read More

Let us first create a table. We have used AUTO_INCREMENT while creating the table to set auto increment for StudentId −mysql> create table DemoTable    -> (    -> StudentId int NOT NULL AUTO_INCREMENT,    -> StudentFirstName varchar(100),    -> StudentLastName varchar(100),    -> StudentAge int,    -> StudentCountryName varchar(100),    -> PRIMARY KEY(StudentId)    -> )AUTO_INCREMENT=30; Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(StudentFirstName, StudentLastName, StudentAge, StudentCountryName) values('John', 'Smith', 21, 'US'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(StudentFirstName, StudentLastName, StudentAge, StudentCountryName) values('Chris', 'Brown', ... Read More

Let us first create a table −mysql> create table DemoTable     -> (     -> Id int,     -> Value int     -> ); Query OK, 0 rows affected (0.68 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 85885); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(101, 885995474); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(100, 895943); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+------+-----------+ | Id   | ... Read More

For this, you can use GROUP BY and use COUNT to get only non-duplicate values. Following is the syntax −select yourColumnName from yourTableName group by yourColumnName having count(*)=1;Let us first create a table −mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> Subject varchar(100)    -> ); Query OK, 0 rows affected (0.70 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Subject) values('MySQL'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable(Subject) values('MongoDB'); Query OK, 1 row affected (0.14 sec) mysql> insert into ... Read More

For this, you can use IFNULL(). Let us first create a table −mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> Value int    -> ); Query OK, 0 rows affected (0.71 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Value) values(100); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(Value) values(140); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(Value) values(200); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable(Value) values(450); Query OK, 1 row affected (0.13 ... Read More

Let us first get the current date using CURDATE(). The current date is as follows −mysql> select CURDATE(); +------------+ | CURDATE() | +------------+ | 2019-06-09 | +------------+ 1 row in set (0.00 sec)Let us first create a table −mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> ShippingDate date    -> ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command. While inserting, we have used date_sub to get the previous day −mysql> insert into DemoTable(ShippingDate) values(date_sub(CURDATE(), interval 1 day)); Query OK, 1 row ... Read More

For this, you can use CREATE TABLE AS SELECT statement. Let us first create a table −mysql> create table DemoTable1    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> CountryName varchar(20)    -> ); Query OK, 0 rows affected (0.68 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1(CountryName) values('US'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1(CountryName) values('UK'); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable1(CountryName) values('AUS'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1(CountryName) values('UK'); Query OK, ... Read More

To return the first n letters, use the LEFT() function. Following is the syntax −select left(yourColumnName, yourValue) from yourTableName;Let us first create a table −mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> CourseTitle text    -> ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(CourseTitle) values('Java with Spring and Hibernate framework'); Query OK, 1 row affected (0.43 sec) mysql> insert into DemoTable(CourseTitle) values('Python Web Development'); Query OK, 1 row affected (0.22 sec)Display all records from the table using ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> Name varchar(20),    -> Age int    -> ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name, Age) values('John', 21); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(Name, Age) values(Null, 20); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(Name, Age) values('David', 23); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(Name, Age) values('Carol', null); ... Read More

For this, use the aggregate function SUM(). Let us first create a table −mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> € int    -> ); Query OK, 0 rows affected (0.71 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(€) values(10); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(€) values(200); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(€) values(190); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select *from ... Read More