Following is the syntax −show variables where Variable_name like 'yourVariable1%' or Variable_name like 'yourVariable2%', .............N;Let us implement the above syntax to show(more than one) variables −mysql> show variables where Variable_name like 'key%' or Variable_name like 'innodb_undo%' or Variable_name like 'innodb_log%';Output+------------------------------------+----------+ | Variable_name                      | Value | +------------------------------------+----------+ | innodb_log_buffer_size             | 1048576 | | innodb_log_checksums               | ON | | innodb_log_compressed_pages        | ON ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> PunchOut timestamp,    -> PunchStatus tinyint(1)    -> ); Query OK,  0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-01-31 6:30:10', 1); Query OK,  1 row affected (0.22 sec) mysql> insert into DemoTable values('2019-02-06 4:10:13', 0); Query OK,  1 row affected (0.14 sec) mysql> insert into DemoTable values('2018-12-16 03:00:30', 0); Query OK,  1 row affected (0.16 sec) mysql> insert into DemoTable values('2016-11-25 02:10:00', 1); Query OK,  1 row affected (0.22 sec)Display all records from the table using select statemen −mysql> select *from DemoTable;Output+---------------------+-------------+ | PunchOut            | PunchStatus | +---------------------+-------------+ | 2019-01-31 06:30:10 |           1 | | 2019-02-06 04:10:13 |           0 | | 2018-12-16 03:00:30 | ... Read More

Use REGEXP to return only the numeric rows. Let us first create a table −mysql> create table DemoTable    -> (    -> StudentId varchar(100)    -> ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John74747'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('8494575Carol'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('985755645'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Carol-9032'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('101'); ... Read More

Use RAND() method for random and to limit a number of records, use the LIMIT() method in MySQL.Let us first create a table −mysql> create table DemoTable    -> (    -> Value int    -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(300); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(600); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(700); Query OK, 1 row ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> DateOfBirth varchar(100)    -> ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019/01/31'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('1980/02/01'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values('1985/04/10'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('1995/06/04'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable values('1990/12/24'); Query OK, 1 row affected (0.18 sec) ... Read More

Use the FORMAT() method for this. Let us first create a table −mysql> create table DemoTable    -> (    -> Amount DECIMAL(10, 2)    -> ); Query OK, 0 rows affected (0.45 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(84848757.60); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(95868685.50); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(4242342.36); Query OK, 1 row affected (0.21 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+-------------+ | Amount      | +-------------+ | 84848757.60 ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> Value int    -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(150); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(180); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(200); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+-------+ | Value ... Read More

Use ORDER BY with DESC to order in descending order. For counting the values, use the COUNT(). For example, if the name “John” appears thrice in the column, then a separate column will display the count 3 and in this way all the count values will be arranged in descending order using the ORDER BY DESC.Let us first create a table −mysql> create table DemoTable -> ( -> EmployeeName varchar(100) -> ); Query OK, 0 rows affected (0.85 sec)Insert some records in the table using insert command −mysql> insert into DemoTable ... Read More

Use MAX() function along with SUBSTRING() for this. Let us first create a table −mysql> create table DemoTable    -> (    -> Id varchar(200)    -> ); Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-0515-1980'); Query OK, 1 row affected (0.49 sec) mysql> insert into DemoTable values('2019-0516-780'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('2019-0517-2780'); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+----------------+ | Id           ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> Id varchar(100),    -> Message varchar(200)    -> ); Query OK, 0 rows affected (1.17 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('1', ''); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values('1', 'Hi'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values('2', 'Hello'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('3', 'Awesome'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('3', ... Read More