To set NULL values, set the type as NULL as in the below syntax −yourColumnName dataType NULL;Let us first create a table −mysql> create table DemoTable759 (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    FirstName varchar(100) NULL ); Query OK, 0 rows affected (0.72 sec)Insert some records in ... Read More

To set the default value, use the DEFAULT keyword.Let us first create a table −mysql> create table DemoTable758 (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    FirstName varchar(100) ); Query OK, 0 rows affected (0.66 sec)Following is the query to set default value for a column −mysql> alter ... Read More

Let’s say you have a VARCHAR column in a table with values are strings and the numbers are on the right side. For example −John1023 Carol9871 David9098Now, consider you want to order by on the basis of these right-side numbers in the entire column. For this, use ORDER BY RIGHT.Let ... Read More

Let us first create a table −mysql> create table DemoTable756 (    Value1 int,    Value2 int,    Value3 int ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable756 values(10, 20, 14); Query OK, 1 row affected (0.22 sec) ... Read More

For this, use alias on HAVING clause.Let us first create a table −mysql> create table DemoTable755 (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    Score1 int,    Score2 int ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into ... Read More

To return only the distinct values, use GROUP BY clause.Let us first create a table −mysql> create table DemoTable754 (ProductPrice int); Query OK, 0 rows affected (0.48 sec)Insert some records in the table using insert command −mysql> insert into DemoTable754 values(200); Query OK, 1 row affected (0.20 sec) mysql> insert ... Read More

To fetch only the month part, use DATE_FORMAT().Let us first create a table −mysql> create table DemoTable753 (DueDate datetime); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable753 values('2019-06-21'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable753 ... Read More

To implement IN() for custom ordering, use ORDER BY CASE.Let us first create a table −mysql> create table DemoTable752 (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    Name varchar(100) ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into ... Read More

For this, you can use GROUP BY HAVING clause.Let us first create a table −mysql> create table DemoTable751 (    StudentName varchar(100),    SubjectName varchar(100) ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable751 values('John', 'MySQL'); Query OK, ... Read More

Let’s say some of the columns values in a table has a specific keyword and you want only those records. For this, use the LIKE operator.Let us first see an example and create a table −mysql> create table DemoTable750 (Title varchar(200)); Query OK, 0 rows affected (0.69 sec)Insert some records ... Read More