To append 000, use the concept of ZEROFILL. Let us first create a table −mysql> create table DemoTable1913    (    Code int(4) ZEROFILL AUTO_INCREMENT NOT NULL,    PRIMARY KEY(Code)    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1913 values(1); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1913 values(2); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1913 values(3); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1913 values(4); Query OK, 1 row affected (0.00 sec)Display all records from the table ... Read More

For this, use ORDER BY along with LIMIT. Let us first create a table wherein we have a column with User id, logged in time, and name −mysql> create table DemoTable1911    (    UserId int,    UserLoggedInTime time,    UserName varchar(20)    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1911 values(100, '7:32:00', 'Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1911 values(101, '5:00:00', 'David'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1911 values(102, '6:10:20', 'Mike'); Query OK, 1 row affected (0.00 ... Read More

For this, you can use CASE WHEN statement. Let us first create a table −mysql> create table DemoTable1910    (    FirstName varchar(20),    Marks int    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1910 values('Chris', 45); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1910 values('David', 85); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1910 values('Chris', 55); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1910 values('Chris', 98); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1910 values('David', ... Read More

To return list of databases, the syntax is as follows −select schema_name as anyAliasName from information_schema.schemata;Here is the query to return list of databases in MySQL −mysql> select schema_name as DatabaseName from information_schema.schemata;This will produce the following output −+---------------------------+ | DatabaseName              | +---------------------------+ | mysql                     | | information_schema        | | performance_schema        | | sys                       | | business                  | | sample                    | | hello                     | | test                      | | mybusiness                | | databasesample            | | schemasample              | | universitydatabase        | | education                 | | mydatabase                | | database1                 | | sampledatabase            | | test3                     | | javadatabase2             | | javasampledatabase        | | rdb                       | | onetomanyrelationship     | | webtracker                | | web                       | | commandline               | | hb_student_tracker        | | bothinnodbandmyisam       | | customertracker           | | tracker                   | | demo                      | | customer_tracker_database | | login                     | | onlinebookstore           | | customer-tracker          | | web_tracker               | | instant_app               | | 1233                      | +---------------------------+ 36 rows in set (0.00 sec)

For this, you need to use SET command only once. Let us first create a table −mysql> create table DemoTable1909    (    Id int NOT NULL,    FirstName varchar(20),    LastName varchar(20)    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1909 values(101, 'John', 'Smith'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1909 values(102, 'John', 'Doe'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1909 values(103, 'Adam', 'Smith'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1909 values(104, 'David', 'Miller'); Query ... Read More

Let us first create a table −mysql> create table DemoTable1908    (    Code text    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1908 values('MySQL(1)Database'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1908 values('MongoDB 2 Database'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1908 values('MySQL(3)Database'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1908 values('SQL Server(10)Database'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1908 values('MySQL 8 Database'); Query OK, 1 row affected (0.00 sec)Display all records from ... Read More

Let us first create a table −mysql> create table DemoTable1907    (    UserId int NOT NULL AUTO_INCREMENT,    UserName varchar(20),    UserAge int,    UserCountryName varchar(20),    PRIMARY KEY(UserId)    )ENGINE=MyISAM, AUTO_INCREMENT=100; Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1907(UserName, UserAge, UserCountryName) values('Chris', 26, 'US'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1907(UserName, UserAge, UserCountryName) values('David', 38, 'UK'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1907(UserName, UserAge, UserCountryName) values('John', 28, 'AUS'); Query OK, 1 row affected (0.00 sec)Display all records from the ... Read More

To change format of dates, use the DATE_FORMAT() function. Let us first create a table −mysql> create table DemoTable1906    (    DueTime datetime    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1906 values(now()); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1906 values(curdate()); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1906 values('2017-10-11'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1906 values('2015-01-12'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1906 values('2018-04-25'); Query OK, 1 row affected (0.00 ... Read More

To fasten the process, you can use INDEX. Let us first create a table −mysql> create table DemoTable1905    (    FirstName varchar(20),    LastName varchar(20) ,    INDEX F_L_Name(FirstName, LastName)    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1905 values('John', 'Smith'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1905 values('John', 'Doe'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1905 values('Adam', 'Smith'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1905 values('John', 'Doe'); Query OK, 1 row affected (0.00 sec) ... Read More

To escape backslashes, use PreparedStatement while inserting records. Let us first create a table −mysql> create table DemoTable1904    (    ClientId int,    ClientName varchar(20),    ClientAge int    ); Query OK, 0 rows affected (0.00 sec)The Java code is as follows −import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; public class EscapeBackslashesDemo {    public static void main(String[] args) {       Connection con = null;       PreparedStatement ps = null;       try {          con = DriverManager.getConnection("jdbc:mysql://localhost:3306/web?" + "useSSL=false", "root", "123456");          String query = "insert into DemoTable1904(ClientId, ... Read More