You can use IFNULL() for this. Let us first create a table −mysql> create table DemoTable -> ( -> added_date date, -> updated_date date -> ); Query OK, 0 rows affected (0.95 sec)Insert some records in the table ... Read More

Use DatabaseMetaData class to retrieve MySQL database structure. In this example, we will display all the table names of database “web” using Java with the help of getMetaData().Following is the Java code −Exampleimport java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; import com.mysql.jdbc.DatabaseMetaData; public class getDatabaseInformationDemo {    public static ... Read More

To add a new column to an existing table, use ADD. With that, to add a new index, use the ADD INDEX(). Let us first create a table −mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT,    -> Name varchar(100),    -> PRIMARY KEY(Id) ... Read More

For this, use BETWEEN operator in MySQL. Let us first create a table −mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> Start int,    -> End int    -> ); Query OK, 0 rows affected (0.91 sec)Insert some records in ... Read More

MySQL evaluates “TRUE or TRUE and FALSE” to true because AND has the highest priority than OR i.e. AND is evaluated before OR.The MySQL evaluates the above statement like this. The AND operator gets evaluated first −(TRUE or (TRUE AND FALSE))The statement (TRUE AND FALSE) gives the result FALSE. Then ... Read More

Let us first create a table −mysql> create table DemoTable -> ( -> Number int -> ); Query OK, 0 rows affected (0.83 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(20); Query OK, 1 row ... Read More

Instead of IN(), use FIND_IN_SET to search between comma separated values within one field. Let us first create a table −mysql> create table DemoTable -> ( -> ListOfValues text -> ); Query OK, 0 rows affected (0.56 sec)Insert some records in ... Read More

Achieve this using ALTER TABLE. Let us first create a table −mysql> create table DemoTable    -> (    -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> StudentName varchar(100)    -> ); Query OK, 0 rows affected (0.86 sec)Let us check the description of the table −mysql> desc ... Read More

Use MIN() function along with SUBSTRING() for minimum, whereas MAX() for maximum. Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Value varchar(100) -> ); Query ... Read More

For more efficiency, use Regular Expression for the same task. Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(30) -> ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert ... Read More